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《Agricultural Research in the Arid Areas》 2015-04
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Monitoring nitrogen content of wheat on basis of an algorithm on the spectral angle of canopy

XIAO Chun-hua;LU Yin-liang;DIAO Wan-ying;LI Shao-kun;WANG Ke-ru;CHEN Bing;WANG Qiong;Agronomy College,Shihezi University,Key Laboratory of Oasis Ecology Agriculture of Xinjiang Construction Group;Institute of Crop Science,Chinese Academy of Agricultural Sciences,Key Laboratory of Crop Physiology and Ecology,Ministry of Agriculture;Institute of Cotton,Xinjiang Academy of Agricultural Reclamation Sciences;  
Nitrogen is an important factor for crop growth and environment. A search for real-time,rapid and accurate monitoring methods on nitrogen nutrition is a necessary approach for precise fertilization and efficiency enhancement. In this paper,three wheat varieties( Xinchun 6,Xinchun 17 and Xinchun 22) were selected to investigate the correlations between the canopy hyperspectral characteristics at four nitrogen levels and the leaves nitrogen content( LNC),and thereby an improved spectral angle( SA) could be utilized for prediction of LNC. The spectral angles of wheat canopy by different nitrogen treatments were higher with the nitrogen increased and the best spectral angle model for prediction of leaf nitrogen was y = 0. 3999x0. 3989. The coefficient of determination R2 was 0.6870,and the RE,RMSE and R2 were 1. 63%,0. 1609,and 0. 7515,respectively. Spectral angle was feasible for monitoring differences in leaves nitrogen content,providing a theoretical basis for precise fertilization in agriculture.
【Fund】: 国家科技支撑计划(2012BAH27B04);; 国家自然科学基金项目(31071371 31460326 31360302)资助;; 石河子大学高层人才项目(RCZX201217)
【CateGory Index】: S512.1
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