variação espectral e eficiência de uso da radiação fotossinteticamente ativa em ensaio com genótipos de trigo spectral variation and radiation use efficiency in a wheat genotype trial

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2005
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Abstract
Medidas de radiometria de campo são utilizadas para quantificar a variação espectral e a eficiência de uso da radiação solar na produção de fitomassa (épsilonF), em um experimento com 20 genótipos de trigo, cultivado na área experimental da Universidade de Taubaté, Taubaté, SP, durante o período de maio a outubro de 1999. A cultura foi irrigada em intervalos semanais, visando manter o solo próximo à capacidade de campo. Foram obtidas oito medidas do fator de refletância da cultura do trigo, entre a emergência das plântulas e a maturação fisiológica dos grãos com o radiômetro Spectron SE-590. Essas medidas foram transformadas no índice de vegetação com diferença normalizada (IVDN) e, juntamente com dados de radiação fotossinteticamente ativa (RFA), foram utilizadas no cálculo da RFA absorvida acumulada (RFAAA) ao longo do ciclo da cultura, a fim de estimar os valores de épsilonF. Pelo resultado, em eF observou-se significativa variação entre genótipos, a técnica de radiometria de campo é uma ferramenta promissora na identificação de genótipos com maior épsilonF, e ainda, para produção de fitomassa, o aproveitamento da radiação, no processo fotossintético, é bem mais relevante do que a RFAAA.
Field radiometry measurements are used to quantify the spectral variation and the solar radiation use efficiency of biomass production (epsilonF), in an experiment with 20 wheat genotypes cultivated at the experimental site of the University of Taubaté in Taubaté, São Paulo State, Brazil, during the period from May to October of 1999. The crop was irrigated on a weekly basis in order to supply water close to soil field capacity. Eight radiometric measurements were taken with the field spectroradiometer Spectron SE-590, from plant emergency through physiological grain maturity. These measurements were transformed into the normalized difference vegetation index (NDVI) that, along with the photosynthetic active radiation (PAR) data, were used to calculate the accumulated absorbed PAR (AAPAR) over the crop growing season in order to estimate the values of epsilonF. The result showed that epsilonF presented a significant variation among genotypes and that the field radiometric technique is a promising tool to identify genotypes with high eF, and furthermore, for biomass production, the use of solar radiation, in the photosynthetic process, is much more relevant than AAPAR.
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moreira2005bragantiavariao Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Mauricio Alves Moreira, Bernardo Friedrich Theodor Rudorff, João Carlos Felício, José Guilherme de Freitas, Marcelo dos Santos Targa
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Journal revista espanola de salud publica
Year 2005
DOI
10.1590/S0006-87052005000300003
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052005000300003
Keywords
remote sensing wheat radiation use efficiency

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