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| SCHWERZ,FELIPE; CARON,BRAULIO O.; ELLI,ELVIS F.; STOLZLE,JOHN R.; MEDEIROS,SANDRO L.P.; SGARBOSSA,JAQUELINE; ROCKENBACH,ANA P.. |
| Abstract: Despite its economic importance, the microclimate in soybean canopies has not yet been studied in detail. Such a study can yield valuable information regarding the interaction of a crop with its environment. In this context, the aim of this study was to evaluate the solar radiation dynamic and yield responses for each canopy strata for two soybean cultivars with determined and undetermined growth habits. A field study was conducted during the 2013/2014 and 2014/2015 growing seasons in the city of Frederico Westphalen, Rio Grande do Sul, Brazil. The cultivar NA6411, with a determinate growth habit, presented a greater interception of radiation in the middle and lower canopies strata which results in higher soybean yield when compared to the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Canopy architecture; Glycine max L.; Radiation use efficiency; Extinction coefficient. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500861 |
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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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| Garrido,Marco; Román,Luis; Silva,Paola; Castellaro,Giorgio; García de Cortázar,Víctor; Acevedo,Edmundo. |
| The genetic coefficients, representative of a crop, are necessary to use growth models; in many cases the range of the species is known, but there are no specific values for varieties. Durum wheat (Triticum turgidumL. ssp. durum)'Llareta-INIA' and 'Corcolén-INIA' were sown under irrigation in the experiment station Antumapu of the Universidad de Chile on 29 June 2007, 19 May 2009, and 15 June 2010 in order to determinate four genetic coefficients: developmental thermal time, phyllochron (PHLN), extinction coefficient (k), and radiation use efficiency (RUE), and to evaluate the performance of these coefficients. Thermal times to anthesis and from anthesis to physiological maturity were 652 and 541 °C d, respectively. Two PHLN values were found, 46.6 °C d... |
| Tipo: Journal article |
Palavras-chave: Simulation; Thermal time; Radiation use efficiency; Extinction coefficient. |
| Ano: 2013 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392013000200002 |
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| Fochesatto,Elizandro; Nied,Astor Henrique; Bergamaschi,Homero; Dalmago,Genei Antonio; Pinto,Daniele Gutterres; Kovaleski,Samuel; Cunha,Gilberto Roca da; Gouvea,Jorge Alberto. |
| ABSTRACT: The objective of this study was to adjust parameters related to the interception of photosynthetically active radiation (PAR) by reproductive structures of spring canola, with different nitrogen levels and hybrids. Two field experiments were conducted, being one with different sowing dates and hybrids (Hyola 61 and Hyola 432) and another with doses of 10, 20, 40, 80, 160kg ha-1 of N, applied in top dressing. They were conducted in Passo Fundo and Coxilha, RS, Brazil, in 2011 and 2014, respectively.The evaluated variables were: area index of reproductive structures, interception efficiency and extinction coefficient of these structures for PAR. PAR interception increased by increasing the reproductive structures volume. Interception efficiency of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brassica napus; Interception efficiency; Extinction coefficient; Silique. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016001001790 |
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