solar radiation use efficiency by soybean under field conditions in the amazon region eficiência do uso da radiação solar pela soja em condições de campo na região amazônica

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ID: 186681
2009
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Ranked #64 of 193 articles by views in proc - the fourth ieee workshop on software technol for future embedded and ubiquitous syst, seus 2006 andthe second int workshop on collaborative comput, integr, and assur, wccia 2006

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Abstract
The objective of this work was to evaluate the efficiency of soybean (Glycine max) in intercepting and using solar radiation under natural field conditions, in the Amazon region, Brazil. The meteorological data and the values of soybean growth and leaf area were obtained from an agrometeorological experiment carried out in Paragominas, Pará state, during 2007 and 2008. The radiation use efficiency (RUE) was obtained from the ratio between the above-ground biomass production and the intercepted photosynthetically active radiation (PAR) accumulated to 99 and 95 days after sowing, in 2007 and 2008, respectively. Climatic conditions during the experiment were very distinct, with reduction in rainfall in 2007, which began during the soybean mid-cycle, due to the El Niño phenomenon. An important reduction in the leaf area index and biomass production was observed during 2007. Under natural field conditions in the Amazon region, the values of RUE were 1.46 and 1.99 g MJ-1 PAR in the 2007 and 2008 experiments, respectively. The probable reason for the differences found between these years might be associated to the water restriction in 2007 coupled with the higher air temperature and vapor pressure deficit, and also to the increase in the fraction of diffuse radiation that reached the land surface in 2008.
O objetivo deste trabalho foi avaliar a eficiência da soja (Glycine max) em interceptar e usar a radiação solar em condições naturais de campo, na região Amazônica do Brasil. Os dados de crescimento e área foliar da soja e dados meteorológicos foram obtidos em um experimento agrometeorológico realizado em Paragominas, PA, em 2007 e 2008. A eficiência do uso da radiação (ERU) foi obtida pela razão entre a produção de massa de matéria seca da parte aérea e o acúmulo da radiação fotossinteticamente ativa interceptada (RFA), até os 99 e 95 dias após a semeadura, em 2007 e 2008, respectivamente. As condições climáticas durante o experimento foram muito distintas, com redução na precipitação em 2007, iniciada na metade do ciclo de cultivo de soja, em consequência do fenômeno El Niño. Observou-se uma importante redução no índice de área foliar e na produção de massa de matéria seca durante 2007. Em tais condições de campo na região Amazônica, os valores de EUR foram de 1,46 e 1,99 g MJ-1 RFA, nos experimentos de 2007 e 2008, respectivamente. A provável razão para as diferenças encontradas entre os anos pode estar associada à redução de água em 2007, em conjunto com a elevada temperatura do ar e o deficit de pressão de vapor, e também ao aumento na fração de radiação difusa que atingiu a superfície do solo em 2008.
Reference Key
souza2009pesquisasolar Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Paulo Jorge de Oliveira Ponte de Souza;Aristides Ribeiro;Edson José Paulino da Rocha;José Renato Bouça Farias;Renata Silva Loureiro;Carlos Capela Bispo;Leila Sampaio
Journal proc - the fourth ieee workshop on software technol for future embedded and ubiquitous syst, seus 2006 andthe second int workshop on collaborative comput, integr, and assur, wccia 2006
Year 2009
DOI
10.1590/S0100-204X2009001000001
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009001000001
Keywords
leaf area index glycine max

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