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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Henestrosa, Ángela; Román Punzón, Julio Miguel; Moreno Alcaide, Manuel; Ruiz Montes, Pablo;

    La aplicación de técnicas digitales para la documentación gráfica es, cada vez, más habitual en los proyectos de investigación arqueológica. Sin embargo, su implementación se ha realizado, en muchos casos, sin la necesaria reflexión crítica acerca de su utilidad real frente a los sistemas tradicionales, y/o un breve análisis que permita optimizar su uso. En este trabajo, pretendemos ofrecer ciertas evidencias al respecto de la relación entre tiempo, usabilidad y precisión en la aplicación de técnicas fotogramétricas para la representación gráfica en intervenciones arqueológicas a partir de nuestra experiencia en la villa romana de Salar. The application of digital techniques for graphical documentation is increasingly common in archaeological research projects. Nevertheless, in many cases these digital techniques have been implemented without the necessary critical reflection regarding their real-world usefulness compared with traditional methods, and/or a brief analysis of their optimal use. This article offers evidence about the relationship between time, usability and accuracy in the application of photogrammetric techniques to graphical representation in archaeological projects, based upon our experience in the Roman villa of Salar.

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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Recolector de Cienci...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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    Authors: Palacio-Aponte, Gerardo;

    Environmental changes due to natural processes and anthropic modifications can be characterized by the degree of land cover modification and its environmental implications over time. The main goal of the present study was to propose and apply a land cover modification geoindicator in order to assess the environmental condition of the territory per landscape units. It was designed to interpret diffuse information and transform it into a synthetic indicator that will be useful for environmental managers. The geoindicator evaluation was performed through a multi-temporal analysis of medium resolution Landsat satellite images and their unsupervised classification according to the direction of land use transitions. A change detection analysis between image pairs from 1973, 1991 and 2001 was made to detect unaffected areas and the areas in which positive or negative land cover changes could be observed. The proposed methodology was applied in the coastal palustrine area; specifically, in the marine-terrestrial ecotone of Campeche, Mexico. Geoindicator values during the 1974-1991 and 1991-2001 periods were low, 46.5% and 40.9%, respectively, due to the intrinsic limitations of coastal wetlands for productive activities. Urban and suburban transition areas showed high degrees of modification of about 39.5% and 32.1% for the first and the second period, respectively. Moderate modification, 4.9% in the first period and 5.7% in the second, was observed in isolated landscape units with recovering vegetation. The proposed geoindicator showed physiognomic and functional evidence of affectation levels from human activities, regeneration patterns and alteration of the landscape structure, modulated by the historical-economic process in the studied area. Rev. Biol. Trop. 62 (3): 1111-1128. Epub 2014 September 01. Los cambios ambientales debidos tanto a procesos naturales como a las modificaciones antrópicas, se pueden caracterizar a través de la modificación de la cobertura y sus implicaciones ambientales en el tiempo. El objetivo del presente estudio es proponer y aplicar un geoindicador de modificación de la cobertura para evaluar la condición ambiental del territorio dentro del ámbito funcional de las unidades de paisaje. La evaluación del geoindicador se basa en el análisis multitemporal de imágenes de satélite Landsat de resolución espacial media y su clasificación no supervisada de acuerdo a la dirección tipificada de transiciones en el uso de la tierra. Incluye la detección de cambios entre pares de imágenes entre 1973, 1991 y 2001 para identificar áreas sin cambio y áreas en las que se observan cambios ambientales positivos o negativos con base en la cobertura. La metodología propuesta se aplicó en la zona costero-palustre de Campeche, México, y los valores encontrados durante los períodos 1974-1991 y 1991-2001 fueron: bajos, de 46.5% y 40.9%, respectivamente, debido a las limitaciones intrínsecas de los humedales costeros para las actividades primarias. Grados altos para las zonas de transición urbana y suburbana con 39.5% y 32.1% para el primero y segundo período, respectivamente. El grado de modificación moderado, oscila entre el 4.9% para el primer período y 5.7% para el segundo periodo, y se observó en unidades del paisaje en etapas sucesionales retrogresivas. El geoindicador propuesto muestra: evidencias fisonómicas directas y funcionales indirectas de la afectación a la cobertura original por las actividades humanas, los patrones dispersos de regeneración, la introducción de elementos alóctonos antrópicos y la artificialización del paisaje original.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ LAReferencia - Red F...arrow_drop_down
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Isela Carrera;

    Underwater robots have considerably changed the exploration of deep sea. Even more, these robots allow performing operations in remote subsea installations. The future of this technology is promising. The purpose of this work is to provide an insight into the subject to postgraduate students, engineers and researchers interested in underwater robotics. Additionally, this work presents a survey of the different subjects that this branch of robotics include. © 2014 CEA. Publicado por Elsevier España, S.L. Todos los derechos reservados.

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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Repositorio Instituc...arrow_drop_down
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Arcângelo Loss; André Geraldo de Lima Moraes; Marcos Gervasio Pereira; Eliane Maria Ribeiro da Silva; +1 Authors

    A evolução de C-CO2 por meio da atividade microbiana do solo pode ser utilizada como parâmetro para evidenciar diferenças em sistemas de produção agroecológica. Este trabalho teve como objetivo avaliar a atividade microbiana do solo por meio da evolução de C-CO2 (carbono mineralizável) oriundo da respiração dos microorganismos sob diferentes sistemas de produção. Foram selecionadas cinco áreas:cultivo de figo; consórcio maracujá – Desmodium sp.; cultivo de milho/feijão, com preparo convencional (PC) do solo; cultivo de berinjela/milho, em sistema plantio direto (PD) e um sistema agroflorestal (SAF). Foram coletadas amostras de solo nas profundidades de 0-0.05 m e 0.05 - 0.10 m, sendo avaliada a evolução de C-CO2 em laboratório e o acúmulo de C-CO2 durante 37 dias. Logo após a incubação, todos os sistemas avaliados apresentaram picos de C-CO2, com variações desses picos mais acentuadas até o 9º dia. Aos 21 dias verificou-se a estabilização da atividade microbiana. O cultivo de figo acarretou em maiores picos de evolução de C-CO2 e, também maiores acúmulos ao final dos 37 dias. A área cultivada sob PD manejado agroecologicamente apresentou menor acúmulo de C-CO2. O PC do solo acarretouem menores picos de C-CO2 em 0.05-0.10 m. The C-CO2 evolution via soil microbial activity can be used as a parameter to highlight differ-ences in agroecological production systems. This work aimed to evaluate the microbial activity of soil through the evolution of C-CO2 (mineralizable carbon) from the respiration of microor-ganisms under different production systems. Was selected five areas: cultivation of fig; passion fruit consortium - Desmodium sp.; cultivation of corn/beans, with conventional tillage (CT) of the soil, cultivation of eggplant/corn under no-tillage (NT) and agroforestry system (AFS). Soil samples were collected at depths of 0.0 - 0.05 and 0.05 - 0.10 m, and was assessed microbial activity (C-CO2 evolution in the laboratory) and the accumulation of C-CO2 for 37 days. Soon after hatching, all systems evaluated showed peaks of C-CO2, with variations of these peaks more pronounced until the 9th day of evaluation. At 21 days there is stabilization of microbial activity. Growing fig resulted in higher peaks of C-CO2 evolution, and also higher accumulations at the end of the 37 day trial. The acreage under NT agroecological showed lower accumulation of C-CO2. The conventional tillage resulted in lower peak C-CO2 at a depth of 5-10 cm. A evolução de C-CO2 por meio da atividade microbiana do solo pode ser utilizada como parâmetro para evidenciar diferenças em sistemas de produção agroecológica. Este trabalho teve como objetivo avaliar a atividade microbiana do solo por meio da evolução de C-CO2 (carbono minera-lizável) oriundo da respiração dos microorganismos sob diferentes sistemas de produção. Foram selecionadas cinco áreas: cultivo de figo; consórcio maracujá – Desmodium sp.; cultivo de mi-lho/feijão, com preparo convencional (PC) do solo; cultivo de berinjela/milho, em sistema plantio direto (PD) e um sistema agroflorestal (SAF). Foram coletadas amostras de solo nas profun-didades de 0-0.05 m e 0.05 - 0.10 m, sendo avaliada a evolução de C-CO2 em laboratório e o acúmulo de C-CO2 durante 37 dias. Logo após a incubação, todos os sistemas avaliados apre-sentaram picos de C-CO2, com variações desses picos mais acentuadas até o 9º dia. Aos 21 dias verificou-se a estabilização da atividade microbiana. O cultivo de figo acarretou em maiores picos de evolução de C-CO2 e, também maiores acúmulos ao final dos 37 dias. A área cultivada sob PD manejado agroecologicamente apresentou menor acúmulo de C-CO2. O PC do solo acarretou em menores picos de C-CO2 em 0.05-0.10.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ LAReferencia - Red F...arrow_drop_down
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    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Acta Agronómica
    Article . 2013
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    Article . 2013
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Sánchez Sarmiento Luz Yaneth; Andrade Castañeda Hernán Jaír; Rojas Molina Jairo;

    En Esparza (Costa Rica) se evaluó la viabilidad de invertir en bancos forrajeros (BF) como alternativa de suplementación para vacas en sistema doble propósito durante la época seca (125 días). Se usaron como indicadores de rentabilidad el Valor Presente Neto (VPN) y la Tasa Interna de Retorno (TIR). Se realizó un análisis de sensibilidad para el incremento del precio de la leche, los concentrados, la gallinaza y la mano de obra. Los modelos se elaboraron comparando los BF de plantas leñosas perennes de corte y acarreo de Cratylia argentea + caña de azúcar (Saccharum officinarum) (BFC) y de ramoneo Leucaena leucocephala (BFL) vs. suplementos comerciales tipos concentrado y gallinaza. En los BFC se requirieron 71.1 jornales/año y el análisis financiero indicó que son rentables al compararlos con la gallinaza (VPN = US$362.2, TIR = 17%) y concentrados (VPN = US$1953.9; TIR=39%). En BFL se requirieron 13 jornales/año y fueron igualmente rentables en comparación con gallinaza (VPN = US$1594.7; TIR = 21%) y con concentrados (VPN = US$3619.6; TIR=35%). Los modelos fueron sensibles a la producción y cambios de precios en la leche, gallinaza, concentrados y el valor del jornal. Los BF son una buena alternativa para la suplementación de ganado en la época seca y una importante fuente de empleo en la región; sin embargo, los altos costos de la mano de obra contratada pueden limitar la adopción. We made a financial analysis in order to assess the feasibility to invest in Fodder Banks as an alternative for supplementing animals in dual purpose systems during the dry season (125 days). Models were constructed to compare cutting and carrying of perennial woody fodder banks (Veranera) Cratylia argentea + sugar cane (Saccharum officinarum) and browsing fodder banks of Leucaena leucocephala with two supplements: concentrates and chicken manure. The indicators used for the financial evaluation of the systems were Net Present Value (NPV) and Internal Return Rate (IRR). A sensitivity analysis was carried out with an increase in milk, concentrate and chicken manure and labor prices. We found that Perennial Fodder Banks required in average 71.1 man labor year-1 for their management. Financial analysis showed that they are profitable when compared to chicken manure (NPV= US$ 362.2; IRR=17%) and concentrates (NPV: US$ 1953.9; IRR=39%). Fodder banks with Leucaena required 13 man labor year-1 for their management.. They are profitable when compared to chicken manure (NPV=US$1594.7; IRR=21%) and with concentrates (NPV=US$3619.6; IRR=35%). The models were sensible to changes in milk production, reduction in price of chicken manure and concentrates and reduction both in the labor price and price of milk. In summary, fodder banks are a good alternative for supplementing animal in the dry season and an important source of employment in the region; nevertheless, the high cost of hired labor could limit their adoption.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Acta Agronómicaarrow_drop_down
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    Acta Agronómica
    Article . 2010
    Data sources: DOAJ-Articles
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    Acta Agronómica
    Article . 2010
    Data sources: DOAJ-Articles
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    Article . 2010
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    Article . 2010
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      Acta Agronómica
      Article . 2010
      Data sources: DOAJ-Articles
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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      Acta Agronómica
      Article . 2010
      Data sources: DOAJ-Articles
      DOAJ
      Article . 2010
      Data sources: DOAJ
      DOAJ
      Article . 2010
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    Authors: Luna Arraes, Christiano; Camacho-Tamayo, Jesús; Tarlé Pissarra, Teresa; Bueno, Célia P; +1 Authors

    The primary objective of this study was to estimate the amount of gas not emitted into the air in areas cultivated with sugarcane (Saccharum offcinarum) that were mechanically harvested. Satellite images CBERS-2/CCD, from 08-13-2004, 08-14-2005, 08-15-2006 and 08-16-2007, of northwestern São Paulo State were processed using the Geographic Information System (GIS)-IDRISI 15.0. Areas of interest (the mechanically-harvested sugarcane felds) were identifed and quantifed based on the spectral response of the bands studied. Based on these data, the amount of gas that was not emitted was evaluated, according to the estimate equation proposed by the Intergovernmental Panel on Climate Change (IPCC). The results of 396.65 km² (5.91% for 2004); 447.56 km² (6.67% for 2005); 511.54 km² (7.62% in 2006); and 474.60 km² (7.07% for 2007), calculated from a total area of 6,710.89 km² with sugarcane, showed a signifcant increase of mechanical harvesting in the study area and a reduction of gas emissions of more than 300,000 t yr-1. Este trabajo tuvo por objetivo estimar temporalmente la cantidad de gases que dejaron de ser emitidos al aire, en áreas cultivadas con caña de azúcar (Saccharum offcinarum), cosechadas mecánicamente, en el noroeste del Estado de São Paulo utilizando imágenes orbitales. Se utilizaron cuatro imágenes del satélite CBERS-2/CCD, con recepción los días 13/08/2004; 14/08/2005; 15/08/2006 e 16/08/2007, donde se procesó por medio del Sistema de Información Geográfca (SIG) IDRISI 15.0. Fue posible, por medio de la clasifcación supervisada, identifcar y cuantifcar las áreas de interés (caña cosechada mecánicamente) debido a las respuestas espectrales de las bandas estudiadas. Con base en estos datos, se valoró la cantidad de gases dejados de emitir, de acuerdo a la estimación propuesta por la Intergovernmental Panel on Climate Change (IPCC). Estas áreas calculadas corresponden a 396,65 km² (5,91% para el 2004), 447,56 km² (6,67% para el 2005); 511,54 km² (7,62% para el 2006) y 474,60 km² (7,07% para el 2007), de un total de 6710,89 km² con caña de azúcar, presentando un aumento signifcativo de la cosecha mecanizada y reducción de emisión de gases de efecto invernadero, superior a 300.000 t año-1, para la zona de estudio.

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    Authors: Xavier, Aloisio; da Silva, Rogério Luiz;

    Nos últimos anos tem-se assistido, no Brasil, a um aumento no interesse pela silvicultura clonal de Eucalyptus, principalmente decorrente das vantagens do processo quanto à possibilidade de contornar problemas de doenças, heterogeneidade e produtividade dos plantios florestais. Diante do crescente uso de clones, tanto pelas grandes empresas como por pequenos investidores, inclusive produtores rurais, têm-se observado consideráveis avanços tecnológicos, nas últimas décadas, quanto aos processos de seleção de árvores, resgate de árvores superiores, avaliação de clones, produção comercial de mudas (estaquia, miniestaquia e microestaquia) e em práticas silviculturais adotadas na implantação e condução dos plantios de florestas clonais. Buscou-se enfocar os principais temas relacionados ao processo de clonagem do Eucalyptus. Evolución de la silvicultura clonal de Eucalyptus en Brasil. En los últimos años, en Brasil, hubo un aumento en el interés por la silvicultura clonal de Eucalyptus, debido principalmente a las ventajas del proceso en cuanto a la posibilidad de resolver problemas de enfermedades, heterogeneidad y productividad de las plantaciones forestales. El creciente uso de clones, tanto por las grandes empresas como por pequeños inversionistas, inclusive productores rurales, generó considerables avances tecnológicos en las últimas décadas, con relación a procesos de selección de árboles, rescate de individuos superiores, evaluación de clones, producción comercial de plantas (estaquilla, miniestaquilla y microestaquilla) y en las prácticas silviculturales adoptadas en la siembra y conducción de plantaciones forestales clonales. En este sentido, se busca enfocar los principales temas relacionados al proceso de clonación de Eucalyptus, involucarados en un programa clonal de esta especie. Evolution in Brazil of Eucalyptus clonal silviculture. In the last years in Brazil there has been an increased interest in Eucalyptus clonal silviculture, mainly due to advantages in diseases control, reduced heterogeneity and increase in commercial plantations productivity. Clone usage has increased among large forestry companies, as well as small investors, including rural producers, due to a better perception of technology advances in last decades, such as processes of plus-tree selection and rescue, clonal evaluation, commercial cuttings production (cutting, minicutting and microcutting), as well as diverse new silvicultural treatments related to clonal forestry. This article focuses on main issues related to Eucalyptus clonal processes, as part of this tree species clonal silviculture.

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    Agronomía Costarricense
    Article . 2010
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      Agronomía Costarricense
      Article . 2010
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      DOAJ
      Article . 2010
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    Authors: Pedrosa Alves Daniel; Pugnal Mattedi André; de Sá Cardoso Tiago; Brunele Caliman Fabiano Ricardo; +1 Authors

    Para avaliar o acúmulo de massa seca (MS) e a partição de fotoassimilados em tomateiro cultivado sob diferentes concentrações de CO2, foi conduzido um experimento no delineamento em blocos casualizados com 12 repetições e as cultivares (cv.) híbridas de tomateiro Andrea e Alambra. O enriquecimento com CO2 foi intermitente (não havendo enriquecimento no período das 10 h 30 min às 16 h) pela utilização de pilha de compostagem como fonte do gás, cuja concentração variou de 600 µl/lt a 750 µl/lt durante o período matinal. O enriquecimento com CO2 alterou somente a partição e o acúmulo de MS de caule na cv. Alambra, permanecendo as demais variáveis, em ambas as cultivares, insensíveis ao tratamento. Houve maior acúmulo de MS nas plantas cultivadas nos ambientes protegidos comparadas às do campo. A cv Andrea acumulou 786.39 g/planta de MS no ambiente protegido + CO2 (AP + CO2), e 815.49 g/planta no ambiente protegido normal (AP normal) e 637.41 g/planta no campo. A cv. Alambra acumulou 766.68 g/planta de MS no AP + CO2, 824.35 g/planta no AP normal e 592.44 g/planta no campo. O maior dreno de fotoassimilados foram os frutos, que acumularam 59%, 63% e 72% da MS das plantas nos AP + CO2, AP normal e campo, respectivamente. Intermittent CO2 enrichment and analysis of the dry matter accumulation and photoassimilate partitioning in tomato submitted to grown in protected environment and field conditions. To assess dry matter (DM) accumulation and photoassimilate partitioning in tomatoes growth under different CO2 concentrations an experiment was conducted in a randomized complete block design with 12 repetitions and two tomato hybrid cultivars cultivar (cv.) Andrea and Alambra. CO2 intermittent enrichment (no enrichment during 10:30a.m. to 4:00p.m.) was provide by compost pile, and gas concentration range from 600 to 750 µl l-1. The CO2 enrichment only changed DM partition and accumulation of the stem in the cv. Alambra, leaving the other variables in both cultivars, insensible to the treatment. DM accumulation was higher in protected environments compared with the field conditions. The cultivar Andrea accumulated 786.39 g of DM pl-1 in the CO2 enriched environment, 815.49 g pl-1 in the protected environment and 637.41 g pl-1 in the field. The cv. Alambra accumulated 766.68 g of DM pl-1 in CO2 enriched environment, 824.35 g pl-1 in the protected environment and 592.44 g pl-1 in the field. The higher sink of photoassimilates were the fruits, which accumulated 59%, 63% and 72% of the plant DM in the CO2 enriched environment, in the protected environment and in the field conditions, respectively.

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    Acta Agronómica
    Article . 2009
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    Acta Agronómica
    Article . 2009
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    Authors: Fábio Moreira Sobreira; Fabricio Moreira Sobreira; Gustavo Sessa Fialho; Gustavo Dias de Almeida; +2 Authors

    A Digital Object Identifier (DOI) não foi disponibilizada pela revista Este trabalho objetivou avaliar a necessidade de realizar análise de trilha individualizada para tomates tipo Salada (L. esculentum) e Cereja (L. esculentum var. cerasiforme), visando obter informações sobre quais variáveis estão relacionadas com a resistência pós-colheita (RPC), e orientar a seleção de materiais para programas de melhoramento. Realizaram-se análises de variâncias, correlações genotípicas, diagnóstico de multicolinearidade e o desdobramento das correlações genotípicas por meio de análise de trilha. As variáveis mais explicativas da RPC em tomates tipo Salada foram o diâmetro da cicatriz do pedúnculo (DCP) e o diâmetro médio do fruto (DMF); a espessura do mesocarpo (ESP) e o peso médio dos frutos (PMF) em tipo Cereja. Em tomates Cereja, ganhos podem ser obtidos na RPC por meio de seleção indireta via ESP. Estes serão maiores se dentre os frutos de maior ESP forem selecionados os de menor PMF. No caso de Salada, deve-se selecionar indiretamente os frutos de menor DCP e dentre estes os de maior DMF. A análise de trilha deve ser realizada considerando cada tipo de tomate, visto que as variáveis explicativas diferem entre estes. This study aimed to evaluate the need for individual path analysis to Cherry (L. esculentum var. cerasiforme) and Salad (L. esculentum) tomatoes type, seeking information about which variables are associated with post-harvest resistance (PHR), and guide the selection of material for breeding programs. We performed the variance analysis, genotypic correlations, multicolinearity diagnosis, and the display of genotypic correlations through path analysis. The more explicatory variables of PHR in Salad tomatoes type were the peduncle scar diameter (PSD) and the fruit mean diameter (FMD); the mesocarp thickness (MST) and fruit mean weight (FMW) in cherry type. For Cherry tomatoes, gains can be obtained in the PHR through indirect selection by MST. This will be greatest if among the fruits with more MST are selected that with lower FMW. In the case of Salad, it must indirectly select the fruits with lower PSD and among these, the fruits with the most FMD. The path analysis should be done considering each type of tomato, since the explicatory variables differ between them.

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    Acta Agronómica
    Article . 2009
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    Acta Agronómica
    Article . 2009
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    Article . 2009
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    Authors: Hoffmann, Odile; Linck, Thierry;

    Introducción a un número espacial de la revista TRACE dedicado a las transformaicones del mundo agrícola y rural mexicano.

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    ProdInra
    Article . 1993
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Henestrosa, Ángela; Román Punzón, Julio Miguel; Moreno Alcaide, Manuel; Ruiz Montes, Pablo;

    La aplicación de técnicas digitales para la documentación gráfica es, cada vez, más habitual en los proyectos de investigación arqueológica. Sin embargo, su implementación se ha realizado, en muchos casos, sin la necesaria reflexión crítica acerca de su utilidad real frente a los sistemas tradicionales, y/o un breve análisis que permita optimizar su uso. En este trabajo, pretendemos ofrecer ciertas evidencias al respecto de la relación entre tiempo, usabilidad y precisión en la aplicación de técnicas fotogramétricas para la representación gráfica en intervenciones arqueológicas a partir de nuestra experiencia en la villa romana de Salar. The application of digital techniques for graphical documentation is increasingly common in archaeological research projects. Nevertheless, in many cases these digital techniques have been implemented without the necessary critical reflection regarding their real-world usefulness compared with traditional methods, and/or a brief analysis of their optimal use. This article offers evidence about the relationship between time, usability and accuracy in the application of photogrammetric techniques to graphical representation in archaeological projects, based upon our experience in the Roman villa of Salar.

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    Authors: Palacio-Aponte, Gerardo;

    Environmental changes due to natural processes and anthropic modifications can be characterized by the degree of land cover modification and its environmental implications over time. The main goal of the present study was to propose and apply a land cover modification geoindicator in order to assess the environmental condition of the territory per landscape units. It was designed to interpret diffuse information and transform it into a synthetic indicator that will be useful for environmental managers. The geoindicator evaluation was performed through a multi-temporal analysis of medium resolution Landsat satellite images and their unsupervised classification according to the direction of land use transitions. A change detection analysis between image pairs from 1973, 1991 and 2001 was made to detect unaffected areas and the areas in which positive or negative land cover changes could be observed. The proposed methodology was applied in the coastal palustrine area; specifically, in the marine-terrestrial ecotone of Campeche, Mexico. Geoindicator values during the 1974-1991 and 1991-2001 periods were low, 46.5% and 40.9%, respectively, due to the intrinsic limitations of coastal wetlands for productive activities. Urban and suburban transition areas showed high degrees of modification of about 39.5% and 32.1% for the first and the second period, respectively. Moderate modification, 4.9% in the first period and 5.7% in the second, was observed in isolated landscape units with recovering vegetation. The proposed geoindicator showed physiognomic and functional evidence of affectation levels from human activities, regeneration patterns and alteration of the landscape structure, modulated by the historical-economic process in the studied area. Rev. Biol. Trop. 62 (3): 1111-1128. Epub 2014 September 01. Los cambios ambientales debidos tanto a procesos naturales como a las modificaciones antrópicas, se pueden caracterizar a través de la modificación de la cobertura y sus implicaciones ambientales en el tiempo. El objetivo del presente estudio es proponer y aplicar un geoindicador de modificación de la cobertura para evaluar la condición ambiental del territorio dentro del ámbito funcional de las unidades de paisaje. La evaluación del geoindicador se basa en el análisis multitemporal de imágenes de satélite Landsat de resolución espacial media y su clasificación no supervisada de acuerdo a la dirección tipificada de transiciones en el uso de la tierra. Incluye la detección de cambios entre pares de imágenes entre 1973, 1991 y 2001 para identificar áreas sin cambio y áreas en las que se observan cambios ambientales positivos o negativos con base en la cobertura. La metodología propuesta se aplicó en la zona costero-palustre de Campeche, México, y los valores encontrados durante los períodos 1974-1991 y 1991-2001 fueron: bajos, de 46.5% y 40.9%, respectivamente, debido a las limitaciones intrínsecas de los humedales costeros para las actividades primarias. Grados altos para las zonas de transición urbana y suburbana con 39.5% y 32.1% para el primero y segundo período, respectivamente. El grado de modificación moderado, oscila entre el 4.9% para el primer período y 5.7% para el segundo periodo, y se observó en unidades del paisaje en etapas sucesionales retrogresivas. El geoindicador propuesto muestra: evidencias fisonómicas directas y funcionales indirectas de la afectación a la cobertura original por las actividades humanas, los patrones dispersos de regeneración, la introducción de elementos alóctonos antrópicos y la artificialización del paisaje original.

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    Authors: Isela Carrera;

    Underwater robots have considerably changed the exploration of deep sea. Even more, these robots allow performing operations in remote subsea installations. The future of this technology is promising. The purpose of this work is to provide an insight into the subject to postgraduate students, engineers and researchers interested in underwater robotics. Additionally, this work presents a survey of the different subjects that this branch of robotics include. © 2014 CEA. Publicado por Elsevier España, S.L. Todos los derechos reservados.

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    Authors: Arcângelo Loss; André Geraldo de Lima Moraes; Marcos Gervasio Pereira; Eliane Maria Ribeiro da Silva; +1 Authors

    A evolução de C-CO2 por meio da atividade microbiana do solo pode ser utilizada como parâmetro para evidenciar diferenças em sistemas de produção agroecológica. Este trabalho teve como objetivo avaliar a atividade microbiana do solo por meio da evolução de C-CO2 (carbono mineralizável) oriundo da respiração dos microorganismos sob diferentes sistemas de produção. Foram selecionadas cinco áreas:cultivo de figo; consórcio maracujá – Desmodium sp.; cultivo de milho/feijão, com preparo convencional (PC) do solo; cultivo de berinjela/milho, em sistema plantio direto (PD) e um sistema agroflorestal (SAF). Foram coletadas amostras de solo nas profundidades de 0-0.05 m e 0.05 - 0.10 m, sendo avaliada a evolução de C-CO2 em laboratório e o acúmulo de C-CO2 durante 37 dias. Logo após a incubação, todos os sistemas avaliados apresentaram picos de C-CO2, com variações desses picos mais acentuadas até o 9º dia. Aos 21 dias verificou-se a estabilização da atividade microbiana. O cultivo de figo acarretou em maiores picos de evolução de C-CO2 e, também maiores acúmulos ao final dos 37 dias. A área cultivada sob PD manejado agroecologicamente apresentou menor acúmulo de C-CO2. O PC do solo acarretouem menores picos de C-CO2 em 0.05-0.10 m. The C-CO2 evolution via soil microbial activity can be used as a parameter to highlight differ-ences in agroecological production systems. This work aimed to evaluate the microbial activity of soil through the evolution of C-CO2 (mineralizable carbon) from the respiration of microor-ganisms under different production systems. Was selected five areas: cultivation of fig; passion fruit consortium - Desmodium sp.; cultivation of corn/beans, with conventional tillage (CT) of the soil, cultivation of eggplant/corn under no-tillage (NT) and agroforestry system (AFS). Soil samples were collected at depths of 0.0 - 0.05 and 0.05 - 0.10 m, and was assessed microbial activity (C-CO2 evolution in the laboratory) and the accumulation of C-CO2 for 37 days. Soon after hatching, all systems evaluated showed peaks of C-CO2, with variations of these peaks more pronounced until the 9th day of evaluation. At 21 days there is stabilization of microbial activity. Growing fig resulted in higher peaks of C-CO2 evolution, and also higher accumulations at the end of the 37 day trial. The acreage under NT agroecological showed lower accumulation of C-CO2. The conventional tillage resulted in lower peak C-CO2 at a depth of 5-10 cm. A evolução de C-CO2 por meio da atividade microbiana do solo pode ser utilizada como parâmetro para evidenciar diferenças em sistemas de produção agroecológica. Este trabalho teve como objetivo avaliar a atividade microbiana do solo por meio da evolução de C-CO2 (carbono minera-lizável) oriundo da respiração dos microorganismos sob diferentes sistemas de produção. Foram selecionadas cinco áreas: cultivo de figo; consórcio maracujá – Desmodium sp.; cultivo de mi-lho/feijão, com preparo convencional (PC) do solo; cultivo de berinjela/milho, em sistema plantio direto (PD) e um sistema agroflorestal (SAF). Foram coletadas amostras de solo nas profun-didades de 0-0.05 m e 0.05 - 0.10 m, sendo avaliada a evolução de C-CO2 em laboratório e o acúmulo de C-CO2 durante 37 dias. Logo após a incubação, todos os sistemas avaliados apre-sentaram picos de C-CO2, com variações desses picos mais acentuadas até o 9º dia. Aos 21 dias verificou-se a estabilização da atividade microbiana. O cultivo de figo acarretou em maiores picos de evolução de C-CO2 e, também maiores acúmulos ao final dos 37 dias. A área cultivada sob PD manejado agroecologicamente apresentou menor acúmulo de C-CO2. O PC do solo acarretou em menores picos de C-CO2 em 0.05-0.10.

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    Acta Agronómica
    Article . 2013
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    Authors: Sánchez Sarmiento Luz Yaneth; Andrade Castañeda Hernán Jaír; Rojas Molina Jairo;

    En Esparza (Costa Rica) se evaluó la viabilidad de invertir en bancos forrajeros (BF) como alternativa de suplementación para vacas en sistema doble propósito durante la época seca (125 días). Se usaron como indicadores de rentabilidad el Valor Presente Neto (VPN) y la Tasa Interna de Retorno (TIR). Se realizó un análisis de sensibilidad para el incremento del precio de la leche, los concentrados, la gallinaza y la mano de obra. Los modelos se elaboraron comparando los BF de plantas leñosas perennes de corte y acarreo de Cratylia argentea + caña de azúcar (Saccharum officinarum) (BFC) y de ramoneo Leucaena leucocephala (BFL) vs. suplementos comerciales tipos concentrado y gallinaza. En los BFC se requirieron 71.1 jornales/año y el análisis financiero indicó que son rentables al compararlos con la gallinaza (VPN = US$362.2, TIR = 17%) y concentrados (VPN = US$1953.9; TIR=39%). En BFL se requirieron 13 jornales/año y fueron igualmente rentables en comparación con gallinaza (VPN = US$1594.7; TIR = 21%) y con concentrados (VPN = US$3619.6; TIR=35%). Los modelos fueron sensibles a la producción y cambios de precios en la leche, gallinaza, concentrados y el valor del jornal. Los BF son una buena alternativa para la suplementación de ganado en la época seca y una importante fuente de empleo en la región; sin embargo, los altos costos de la mano de obra contratada pueden limitar la adopción. We made a financial analysis in order to assess the feasibility to invest in Fodder Banks as an alternative for supplementing animals in dual purpose systems during the dry season (125 days). Models were constructed to compare cutting and carrying of perennial woody fodder banks (Veranera) Cratylia argentea + sugar cane (Saccharum officinarum) and browsing fodder banks of Leucaena leucocephala with two supplements: concentrates and chicken manure. The indicators used for the financial evaluation of the systems were Net Present Value (NPV) and Internal Return Rate (IRR). A sensitivity analysis was carried out with an increase in milk, concentrate and chicken manure and labor prices. We found that Perennial Fodder Banks required in average 71.1 man labor year-1 for their management. Financial analysis showed that they are profitable when compared to chicken manure (NPV= US$ 362.2; IRR=17%) and concentrates (NPV: US$ 1953.9; IRR=39%). Fodder banks with Leucaena required 13 man labor year-1 for their management.. They are profitable when compared to chicken manure (NPV=US$1594.7; IRR=21%) and with concentrates (NPV=US$3619.6; IRR=35%). The models were sensible to changes in milk production, reduction in price of chicken manure and concentrates and reduction both in the labor price and price of milk. In summary, fodder banks are a good alternative for supplementing animal in the dry season and an important source of employment in the region; nevertheless, the high cost of hired labor could limit their adoption.

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    Acta Agronómica
    Article . 2010
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    Authors: Luna Arraes, Christiano; Camacho-Tamayo, Jesús; Tarlé Pissarra, Teresa; Bueno, Célia P; +1 Authors

    The primary objective of this study was to estimate the amount of gas not emitted into the air in areas cultivated with sugarcane (Saccharum offcinarum) that were mechanically harvested. Satellite images CBERS-2/CCD, from 08-13-2004, 08-14-2005, 08-15-2006 and 08-16-2007, of northwestern São Paulo State were processed using the Geographic Information System (GIS)-IDRISI 15.0. Areas of interest (the mechanically-harvested sugarcane felds) were identifed and quantifed based on the spectral response of the bands studied. Based on these data, the amount of gas that was not emitted was evaluated, according to the estimate equation proposed by the Intergovernmental Panel on Climate Change (IPCC). The results of 396.65 km² (5.91% for 2004); 447.56 km² (6.67% for 2005); 511.54 km² (7.62% in 2006); and 474.60 km² (7.07% for 2007), calculated from a total area of 6,710.89 km² with sugarcane, showed a signifcant increase of mechanical harvesting in the study area and a reduction of gas emissions of more than 300,000 t yr-1. Este trabajo tuvo por objetivo estimar temporalmente la cantidad de gases que dejaron de ser emitidos al aire, en áreas cultivadas con caña de azúcar (Saccharum offcinarum), cosechadas mecánicamente, en el noroeste del Estado de São Paulo utilizando imágenes orbitales. Se utilizaron cuatro imágenes del satélite CBERS-2/CCD, con recepción los días 13/08/2004; 14/08/2005; 15/08/2006 e 16/08/2007, donde se procesó por medio del Sistema de Información Geográfca (SIG) IDRISI 15.0. Fue posible, por medio de la clasifcación supervisada, identifcar y cuantifcar las áreas de interés (caña cosechada mecánicamente) debido a las respuestas espectrales de las bandas estudiadas. Con base en estos datos, se valoró la cantidad de gases dejados de emitir, de acuerdo a la estimación propuesta por la Intergovernmental Panel on Climate Change (IPCC). Estas áreas calculadas corresponden a 396,65 km² (5,91% para el 2004), 447,56 km² (6,67% para el 2005); 511,54 km² (7,62% para el 2006) y 474,60 km² (7,07% para el 2007), de un total de 6710,89 km² con caña de azúcar, presentando un aumento signifcativo de la cosecha mecanizada y reducción de emisión de gases de efecto invernadero, superior a 300.000 t año-1, para la zona de estudio.

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    Authors: Xavier, Aloisio; da Silva, Rogério Luiz;

    Nos últimos anos tem-se assistido, no Brasil, a um aumento no interesse pela silvicultura clonal de Eucalyptus, principalmente decorrente das vantagens do processo quanto à possibilidade de contornar problemas de doenças, heterogeneidade e produtividade dos plantios florestais. Diante do crescente uso de clones, tanto pelas grandes empresas como por pequenos investidores, inclusive produtores rurais, têm-se observado consideráveis avanços tecnológicos, nas últimas décadas, quanto aos processos de seleção de árvores, resgate de árvores superiores, avaliação de clones, produção comercial de mudas (estaquia, miniestaquia e microestaquia) e em práticas silviculturais adotadas na implantação e condução dos plantios de florestas clonais. Buscou-se enfocar os principais temas relacionados ao processo de clonagem do Eucalyptus. Evolución de la silvicultura clonal de Eucalyptus en Brasil. En los últimos años, en Brasil, hubo un aumento en el interés por la silvicultura clonal de Eucalyptus, debido principalmente a las ventajas del proceso en cuanto a la posibilidad de resolver problemas de enfermedades, heterogeneidad y productividad de las plantaciones forestales. El creciente uso de clones, tanto por las grandes empresas como por pequeños inversionistas, inclusive productores rurales, generó considerables avances tecnológicos en las últimas décadas, con relación a procesos de selección de árboles, rescate de individuos superiores, evaluación de clones, producción comercial de plantas (estaquilla, miniestaquilla y microestaquilla) y en las prácticas silviculturales adoptadas en la siembra y conducción de plantaciones forestales clonales. En este sentido, se busca enfocar los principales temas relacionados al proceso de clonación de Eucalyptus, involucarados en un programa clonal de esta especie. Evolution in Brazil of Eucalyptus clonal silviculture. In the last years in Brazil there has been an increased interest in Eucalyptus clonal silviculture, mainly due to advantages in diseases control, reduced heterogeneity and increase in commercial plantations productivity. Clone usage has increased among large forestry companies, as well as small investors, including rural producers, due to a better perception of technology advances in last decades, such as processes of plus-tree selection and rescue, clonal evaluation, commercial cuttings production (cutting, minicutting and microcutting), as well as diverse new silvicultural treatments related to clonal forestry. This article focuses on main issues related to Eucalyptus clonal processes, as part of this tree species clonal silviculture.

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    Agronomía Costarricense
    Article . 2010
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      Agronomía Costarricense
      Article . 2010
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      DOAJ
      Article . 2010
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    Authors: Pedrosa Alves Daniel; Pugnal Mattedi André; de Sá Cardoso Tiago; Brunele Caliman Fabiano Ricardo; +1 Authors

    Para avaliar o acúmulo de massa seca (MS) e a partição de fotoassimilados em tomateiro cultivado sob diferentes concentrações de CO2, foi conduzido um experimento no delineamento em blocos casualizados com 12 repetições e as cultivares (cv.) híbridas de tomateiro Andrea e Alambra. O enriquecimento com CO2 foi intermitente (não havendo enriquecimento no período das 10 h 30 min às 16 h) pela utilização de pilha de compostagem como fonte do gás, cuja concentração variou de 600 µl/lt a 750 µl/lt durante o período matinal. O enriquecimento com CO2 alterou somente a partição e o acúmulo de MS de caule na cv. Alambra, permanecendo as demais variáveis, em ambas as cultivares, insensíveis ao tratamento. Houve maior acúmulo de MS nas plantas cultivadas nos ambientes protegidos comparadas às do campo. A cv Andrea acumulou 786.39 g/planta de MS no ambiente protegido + CO2 (AP + CO2), e 815.49 g/planta no ambiente protegido normal (AP normal) e 637.41 g/planta no campo. A cv. Alambra acumulou 766.68 g/planta de MS no AP + CO2, 824.35 g/planta no AP normal e 592.44 g/planta no campo. O maior dreno de fotoassimilados foram os frutos, que acumularam 59%, 63% e 72% da MS das plantas nos AP + CO2, AP normal e campo, respectivamente. Intermittent CO2 enrichment and analysis of the dry matter accumulation and photoassimilate partitioning in tomato submitted to grown in protected environment and field conditions. To assess dry matter (DM) accumulation and photoassimilate partitioning in tomatoes growth under different CO2 concentrations an experiment was conducted in a randomized complete block design with 12 repetitions and two tomato hybrid cultivars cultivar (cv.) Andrea and Alambra. CO2 intermittent enrichment (no enrichment during 10:30a.m. to 4:00p.m.) was provide by compost pile, and gas concentration range from 600 to 750 µl l-1. The CO2 enrichment only changed DM partition and accumulation of the stem in the cv. Alambra, leaving the other variables in both cultivars, insensible to the treatment. DM accumulation was higher in protected environments compared with the field conditions. The cultivar Andrea accumulated 786.39 g of DM pl-1 in the CO2 enriched environment, 815.49 g pl-1 in the protected environment and 637.41 g pl-1 in the field. The cv. Alambra accumulated 766.68 g of DM pl-1 in CO2 enriched environment, 824.35 g pl-1 in the protected environment and 592.44 g pl-1 in the field. The higher sink of photoassimilates were the fruits, which accumulated 59%, 63% and 72% of the plant DM in the CO2 enriched environment, in the protected environment and in the field conditions, respectively.

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    Acta Agronómica
    Article . 2009
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    Acta Agronómica
    Article . 2009
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    DOAJ
    Article . 2009
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    Article . 2009
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    Authors: Fábio Moreira Sobreira; Fabricio Moreira Sobreira; Gustavo Sessa Fialho; Gustavo Dias de Almeida; +2 Authors

    A Digital Object Identifier (DOI) não foi disponibilizada pela revista Este trabalho objetivou avaliar a necessidade de realizar análise de trilha individualizada para tomates tipo Salada (L. esculentum) e Cereja (L. esculentum var. cerasiforme), visando obter informações sobre quais variáveis estão relacionadas com a resistência pós-colheita (RPC), e orientar a seleção de materiais para programas de melhoramento. Realizaram-se análises de variâncias, correlações genotípicas, diagnóstico de multicolinearidade e o desdobramento das correlações genotípicas por meio de análise de trilha. As variáveis mais explicativas da RPC em tomates tipo Salada foram o diâmetro da cicatriz do pedúnculo (DCP) e o diâmetro médio do fruto (DMF); a espessura do mesocarpo (ESP) e o peso médio dos frutos (PMF) em tipo Cereja. Em tomates Cereja, ganhos podem ser obtidos na RPC por meio de seleção indireta via ESP. Estes serão maiores se dentre os frutos de maior ESP forem selecionados os de menor PMF. No caso de Salada, deve-se selecionar indiretamente os frutos de menor DCP e dentre estes os de maior DMF. A análise de trilha deve ser realizada considerando cada tipo de tomate, visto que as variáveis explicativas diferem entre estes. This study aimed to evaluate the need for individual path analysis to Cherry (L. esculentum var. cerasiforme) and Salad (L. esculentum) tomatoes type, seeking information about which variables are associated with post-harvest resistance (PHR), and guide the selection of material for breeding programs. We performed the variance analysis, genotypic correlations, multicolinearity diagnosis, and the display of genotypic correlations through path analysis. The more explicatory variables of PHR in Salad tomatoes type were the peduncle scar diameter (PSD) and the fruit mean diameter (FMD); the mesocarp thickness (MST) and fruit mean weight (FMW) in cherry type. For Cherry tomatoes, gains can be obtained in the PHR through indirect selection by MST. This will be greatest if among the fruits with more MST are selected that with lower FMW. In the case of Salad, it must indirectly select the fruits with lower PSD and among these, the fruits with the most FMD. The path analysis should be done considering each type of tomato, since the explicatory variables differ between them.

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    Acta Agronómica
    Article . 2009
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    Acta Agronómica
    Article . 2009
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    DOAJ
    Article . 2009
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    Article . 2009
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    Authors: Hoffmann, Odile; Linck, Thierry;

    Introducción a un número espacial de la revista TRACE dedicado a las transformaicones del mundo agrícola y rural mexicano.

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    ProdInra
    Article . 1993
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