Method for estimating plant nitrogen content based on three-waveband spectrum index
A technology of spectral index and nitrogen content, which is applied in the field of remote sensing of agricultural vegetation, can solve the problems of slow increase of NDVI and influence on sensitivity, etc., and achieve the effect of overcoming sensitivity decline, high precision and accuracy, and realizing real-time acquisition
Active Publication Date: 2012-05-02
神农智慧农业研究院南京有限公司
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However, one of the main defects of NDVI is that when the vegetation coverage is greater than 80%, the NDVI value increases slowly and becomes saturated, which seriously affects the sensitivity of monitoring.
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[0028] The present invention will be further described below in conjunction with the accompanying drawings.
[0029] S101 Determination of plant nitrogen content, spectral sampling
[0030] The sample information comes from different varieties of rice and wheat in different ecological points, and a total of 8 rice and wheat experimental fields were treated with different nitrogen fertilizers and water treatments. Rice varieties include Wuxiangjing 9, Huajing 2, Nipponbare, Wuxiangjing 14, 27123 and Liangyoupeijiu; wheat varieties include Ningmai 9, Yangmai 12, Yumai 34, Huaimai 25 and Xumai 856. Nitrogen fertilizer treatment (rice: 0~405kg·hm -2 , Wheat: 0~270kg·hm -2 ). Water treatment (-60, -40, -20, 5cm water layer irrigation, field water capacity percentage 40%-45%, 60%-65%, 75%-80% and 100%). Ecological sites include Nanjing and Huai'an. The sample information was collected from 2004 to 2009.
[0031] This implementation monitors the nitrogen content of rice and whe...
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The invention discloses a method for estimating plant nitrogen content based on a three-waveband spectrum index, which belongs to the field of plant remote sensing and monitoring. In the method, a blue-green light waveband and a correcting coefficient thereof are added on the basis of a near-infrared light wavelength and a visible red light wavelength, a monitoring model for the three-waveband spectrum index and the nitrogen content is built, meanwhile, a test model of the monitoring model is provided. The method overcomes the defect that the sensitivity is declined when the traditional two-waveband spectrum index method tends to be saturated; the method has higher precision and accuracy particularly for monitoring nitrogen content of wheat leaves and paddy rice with different varieties, different water content treatments and different nitrogen levels; the method realizes real-time acquisition of crop nitrogen information; and the method facilitates wide application of a crop non-destructive monitoring technology based on a spectrum technology.
Description
technical field [0001] The invention relates to the field of agricultural vegetation remote sensing, in particular to a method for estimating plant nitrogen content based on a three-band spectral index. Background technique [0002] The application of nitrogen fertilizer is an effective way to improve crop yield and quality, but unscientific nitrogen fertilizer input will make crops unable to fully absorb and utilize it, resulting in economic losses and ecological pollution. Therefore, in recent years, people have begun to study precise nitrogen fertilizer management, thereby improving the effective way of nitrogen fertilizer use efficiency, and accurate and real-time acquisition of nitrogen status of field crops is the basis of precise nitrogen fertilizer management. [0003] The traditional method of obtaining plant nitrogen nutrition mainly relies on destructive sampling and indoor analysis and measurement. Although the results are relatively reliable, they have a certain...
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Inventor 朱艳姚霞王薇曹卫星田永超倪军刘小军孙传范
Owner 神农智慧农业研究院南京有限公司