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| Souza,Paulo Jorge de Oliveira Ponte de; Ribeiro,Aristides; Rocha,Edson José Paulino da; Farias,José Renato Bouça; Loureiro,Renata Silva; Bispo,Carlos Capela; Sampaio,Leila. |
| 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... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Amazon region; Leaf area index; Radiation interception. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009001000001 |
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| Oyarzún,Ricardo; Stöckle,Claudio; Wu,Joan; Whiting,Matthew. |
| In many crop models, the process of radiation transmittance through the canopy is normally described as an exponential attenuation process (Beers Law equation), which is assumed to be valid for canopies covering the ground with a random spatial distribution of leaves. However, for discontinuous canopies, where a distinctive row pattern of plant exists, there is a more complex situation because of the presence of gaps between individual plants. This must be accounted for when characterizing radiation relationships for these kinds of systems, in particular when short time-scales are of interest. Photosynthetically active radiation (PAR) transmittance (τPAR) is more commonly studied and reported than global solar radiation (Sg) transmittance... |
| Tipo: Journal article |
Palavras-chave: Radiation interception; Extinction coefficient; Crop simulation model. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000100015 |
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