A Leaf Layer Spectral Model for Estimating Protein Content of Wheat Grains

文献类型： 外文期刊

第一作者： Xiao, Chun-Hua

作者： Xiao, Chun-Hua;Li, Shao-Kun;Wang, Ke-Ru;Wang, Fang-Yong;Li, Shao-Kun;Wang, Ke-Ru;Lu, Yan-Li;Bai, Jun-Hua;Xie, Rui-Zhi;Gao, Shi-Ju;Wang, Qiong;Li, Shao-Kun

作者机构：

关键词： wheat canopy;leaf distribution;direction spectra;view angle;model

期刊名称：COMPUTER AND COMPUTING TECHNOLOGIES IN AGRICULTURE IV, PT 4

ISSN： 1868-4238

年卷期： 2011 年 347 卷

页码：

收录情况： SCI

摘要： The spectral signatures of crop canopies in the field provide much information relating morphological or quality characteristics of crops to their optical properties. This experiment was conducted using two winter-wheat (Triticum aestivum) cultivars, Jingdong8 (with erect leaves) and Zhongyou9507 (with horizontal leaves). We analysiced the relation between the direction spectral characteristics and the laeves nitrogen content(LNC). The result showed that the spectral information observed at the 0 degrees angle mainly provided information on the upper canopy and the lower layer had little impact on their spectra. However, the spectral information observed at 30 degrees and 60 degrees angles reflected the whole canopy information and the status of the lower layer of the canopy had great effects on their spectra. Variance analysis indicated that the ear layer of canopy and the topmost leaf blade made greater contributions to CDS. The predicted grain protein content (GPC) model by leaf layers spectra using 0 degrees view angle was the best with root mean squares (RMSE) of 0.7500 for Jingdong8 and 0.6461 for Zhongyou9507. The coefficients of determination, R-2 between measured and estimated grain protein contents were 0.7467 and 0.7599. Thus, grain protein may be reliably predicted from the leaf layer spectral model.

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