Rapid Diagnostics of Early Phosphorus Deficiency in Mini-Cucumber Plants under Protected Cultivation by Near Infrared Spectroscopy
SHI Ji-yong1, ZOU Xiao-bo1*, ZHAO Jie-wen1, MAO Han-ping2, WANG Kai-liang1, CHEN Zheng-wei1, HUANG Xiao-wei1
1. School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China 2. Key Laboratory of Modern Agricultural Equipment and Technology, Jiangsu University, Zhenjiang 212013, China
Abstract:The morphological symptom of phosphorus deficiency at early stage is similar to the appearance of leaf aging process in preliminary phase, so that visual diagnostics of phosphorus deficiency in mini-cucumber plants at early stage is practically impossible. Near infrared reflectance spectra contain information about differences in compositions of leaf tissues between phosphorus-deficient plants and healthy plants. In the present paper, near infrared reflectance spectroscopy was used to provide diagnostic information on phosphorus deficiency of mini-cucumber plants grown under non-soil conditions. Near infrared spectra was collected from 90 leaves of mini-cucumber plants. Raw cucumber spectra was preprocessed by SNV and divided into 27 intervals. The top 10 principal components (PCs) were extracted as the input of BP-ANN classifiers by principal component analysis (PCA) while the values of nutrient deficient were used as the output variables of BP-ANN and three layers BP-ANN discrimination model was built. The best experiment results were based on the top 3 principal components of No.7 interval when the spectra was divided into 27 intervals and identification rates of the ANN model are 100% in both training set and the prediction set. The overall results show that NIR spectroscopy combined with BP-ANN can be efficiently utilized for rapid and early diagnostics of phosphorus deficiency in mini-cucumber plants.
Key words:Diagnostics of deficiency;Near infrared spectroscopy;Phosphorus;Mini-cucumber plants;BP-ANN
石吉勇1,邹小波1*,赵杰文1,毛罕平2,王开亮1,陈正伟1,黄晓玮1 . 基于近红外光谱的设施栽培水果黄瓜磷元素亏缺初期快速诊断[J]. 光谱学与光谱分析, 2011, 31(12): 3264-3268.
SHI Ji-yong1, ZOU Xiao-bo1*, ZHAO Jie-wen1, MAO Han-ping2, WANG Kai-liang1, CHEN Zheng-wei1, HUANG Xiao-wei1. Rapid Diagnostics of Early Phosphorus Deficiency in Mini-Cucumber Plants under Protected Cultivation by Near Infrared Spectroscopy . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2011, 31(12): 3264-3268.
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