Study on Plant Nutrition Indicator Using Leaf Spectral Transmittance for Nitrogen Detection
The low fertilizer utilization at growing season and environment pollution coursed by unreasonable fertilization are becoming global outstanding problems in agricultural production. Scientific and reasonable fertilization based on rapid and nondestructive plant nutrient detection will be a valuable solution for solving above problems. In this study, spectral transmittance in wavelength ranged from 300 to 1100 nm, chlorophyll content and nitrogen content of rice and cucumber leaves treated with culture solution in five different nitrogen levels were measured. According to the correlation analysis between them, 560, 650, and 720 nm as feature wavelengths and 940 nm as reference wavelength were determined for nitrogen detection. Correlation analysis between 21 spectral feature parameters composed by the transmittance at above wavelength, the leaf chlorophyll content and nitrogen content, and combined with their regression examination indicated that spectral feature parameters of (T94O-T560) / (T940 + T560), log (T940/T560) and log (T940/T650) are useful to conduct plant nutrient diagnosis with less than 8％ relative error in rice and cucumber leaves. Therefore, the above spectral feature parameters as plant nitrogen indicators can be used to estimate the chlorophyll content and nitrogen content, furthermore support for nondestructive plant nutrient detection and fertilizer recommendation based on testing soil.
Chlorophyll content Nitrogen content Spectral feature parameter Spectral transmittance.
Juanxiu Hu Dongxian He Po Yang
Key Lab. of Agriculture Engineering in Structure and Environment,College of Water Conservation and Civil Engineering, China Agricultural University,Beijing, P.R. China
国际会议
南昌
英文
504-513
2010-10-22（万方平台首次上网日期，不代表论文的发表时间）