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首页> 外文期刊>Journal of Agrometeorology >Canopy reflectance spectra of wheat as related to crop yield, grain protein under different management practices
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Canopy reflectance spectra of wheat as related to crop yield, grain protein under different management practices

机译：不同管理方式下小麦冠层反射光谱与作物产量，籽粒蛋白质的关系

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Afield experiment was conducted during the winter season of 2010-2011 in a sandy loam soil at the Research Farm of the Indian Agricultural Research Institute, New Delhi, India to study the relationship of canopy reflectance with the yield and proteincontent of wheat as infuenced by different irrigation and nitrogen levels. Three spectral reflectance indices (SRI) related to canopy photosynthetic area were calculated using spectral reflectance values viz., Red normalized difference vegetation index (RNDVI), Green normalized difference vegetation index (GNDVI) and Simple ratio (SR). The RNDVI, GNDVI and SR increased from Crown Root Initiation (CRI) to booting stage and there after decreased progressively till maturity. Among the three SRIs, GNDVI atmilking stage was most closely related to grain yield (r=0.97**) and biomass yield (r= 0.93**) of wheat and at booting stage it was most closely related to the protein content (r=0.90**). The GNDVI was the best index for prediction of grain yield, biomass yield and grain protein percentage in wheat.
机译：在2010-2011年冬季，在印度新德里印度农业研究所的研究农场的沙质壤土上进行了田间试验，研究了冠层反射率与小麦产量和蛋白质含量（受不同品种的影响）之间的关系。灌溉和氮水平。使用光谱反射率值即红色归一化差异植被指数（RNDVI），绿色归一化差异植被指数（GNDVI）和简单比率（SR），计算了与冠层光合面积相关的三个光谱反射率指数（SRI）。 RNDVI，GNDVI和SR从树冠起始（CRI）到启动阶段逐渐增加，然后逐渐下降直至成熟。在这三个SRI中，GNDVI处于泌乳阶段与小麦的籽粒产量（r = 0.97 **）和生物质产量（r = 0.93 **）最相关，而在孕穗期与蛋白质含量（r = 0.90 **）。 GNDVI是预测小麦籽粒产量，生物量产量和蛋白质含量的最佳指标。

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