Estimation of Winter Wheat Protein Content Based on New Indexes
JIN Xiu-liang1, 2, 3, XU Xin-gang2, 3, LI Zhen-hai2, 3, WANG Qian2, 3, WANG Yan1, 2, 3, LI Cun-jun2, 3, WANG Ji-hua2*
1. Key Laboratory of Crop Genetics and Physiology of Jiangsu Province/Key Laboratory of Crop Physiology, Ecology and Cultivation in Middle and Lower Reaches of Yangtse River of Ministry of Agriculture, Yangzhou University, Yangzhou 225009, China 2. National Engineering Research Center for Information Technology in Agriculture, Beijing 100097, China 3. Key Laboratory for Information Technologies in Agriculture, Ministry of Agriculture, Beijing 100097, China
Abstract：Wheat protein content is an important indicator often employed in wheat sale price. Spectral indexes and concurrent winter wheat protein content (WWPC) samples were obtained across three years. Data from 2008/2009 and 2009/2010 were utilized to build the new ratio indexes and product indexes, and then selected grey relational method and partial least squares method were used to improve the estimation accuracy of WWPC, data from 2011/2012 was utilized to validate model. The results showed that the correlation coefficients between ratio indexes and WWPC were better than that between single indexes and WWPC. The r of single indexes and ratio indexes were 0.726 and 0.751, respectively, and the product indexes were used to improve the parts of single indexes. The estimation accuracy of WWPC was improved by using GRA-PLS, the determination coefficients (R2) of single indexes, ratio indexes and product indexes were 0.537, 0.631 and 0.521, respectively, and corresponding root mean square errors (RMSE) were 0.665%, 0.564% and 0.574%, respectively. The results indicated that it was feasible to estimate WWPC by building new ratio indexes and product indexes, and then applying the GRA-PLS.
Key words：New vegetation index;Protein content;Grey relational method;Partial least squares method
金秀良1, 2, 3，徐新刚2, 3，李振海2, 3，王 芊2, 3，王 妍1, 2, 3，李存军2, 3，王纪华2* . 基于新型植被指数对冬小麦蛋白质含量的估算研究 [J]. 光谱学与光谱分析, 2013, 33(09): 2541-2545.
JIN Xiu-liang1, 2, 3, XU Xin-gang2, 3, LI Zhen-hai2, 3, WANG Qian2, 3, WANG Yan1, 2, 3, LI Cun-jun2, 3, WANG Ji-hua2* . Estimation of Winter Wheat Protein Content Based on New Indexes . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(09): 2541-2545.
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