Research on Fast Detecting Tomato Seedlings Nitrogen Content Based on NIR Characteristic Spectrum Selection
WU Jing-zhu1, WANG Feng-zhu2, WANG Li-li2, ZHANG Xiao-chao2, MAO Wen-hua2*
1. School of Computer and Information Engineering, Beijing Technology and Business University, Beijing 100048, China 2. Chinese Academy of Agricultural Mechanization Sciences, Beijing 100083, China
Abstract：In order to improve the accuracy and robustness of detecting tomato seedlings nitrogen content based on near-infrared spectroscopy (NIR), 4 kinds of characteristic spectrum selecting methods were studied in the present paper, i.e. competitive adaptive reweighted sampling (CARS), Monte Carlo uninformative variables elimination (MCUVE), backward interval partial least squares (BiPLS) and synergy interval partial least squares (SiPLS). There were totally 60 tomato seedlings cultivated at 10 different nitrogen-treatment levels (urea concentration from 0 to 120 mg·L-1)，with 6 samples at each nitrogen-treatment level. They are in different degrees of over nitrogen, moderate nitrogen, lack of nitrogen and no nitrogen status. Each sample leaves were collected to scan near-infrared spectroscopy from 12 500 to 3 600 cm-1. The quantitative models based on the above 4 methods were established. According to the experimental result, the calibration model based on CARS and MCUVE selecting methods show better performance than those based on BiPLS and SiPLS selecting methods, but their prediction ability is much lower than that of the latter. Among them, the model built by BiPLS has the best prediction performance. The correlation coefficient (r), root mean square error of prediction (RMSEP) and ratio of performance to standard derivate (RPD) is 0.952 7, 0.118 3 and 3.291, respectively. Therefore, NIR technology combined with characteristic spectrum selecting methods can improve the model performance. But the characteristic spectrum selecting methods are not universal. For the built model based on single wavelength variables selection is more sensitive, it is more suitable for the uniform object. While the anti-interference ability of the model built based on wavelength interval selection is much stronger, it is more suitable for the uneven and poor reproducibility object. Therefore, the characteristic spectrum selection will only play a better role in building model, combined with the consideration of sample state and the model indexes.
吴静珠1，汪凤珠2，王丽丽2，张小超2，毛文华2* . 基于近红外特征光谱的番茄苗氮含量快速测定方法研究 [J]. 光谱学与光谱分析, 2015, 35(01): 99-103.
WU Jing-zhu1, WANG Feng-zhu2, WANG Li-li2, ZHANG Xiao-chao2, MAO Wen-hua2* . Research on Fast Detecting Tomato Seedlings Nitrogen Content Based on NIR Characteristic Spectrum Selection . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2015, 35(01): 99-103.
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