Research Progress on the Water and Nitrogen Detection Using Spectral Reflectance
作物水分和氮素光谱诊断研究进展

Water and nutrient are the main limitation factors for crop production. On-site and precise detection of crop water and nutrient content is necessary for improving crop water and nutrient management, and the use efficiency of water and nutrients;reducing environmental pollution caused by over fertilization; and promoting water-saving agriculture production. In this paper, firstly, a brief introduction to the eco-physiological basis of plant spectral characters and the principles of spectra detection of plant water and nitrogen content were presented. An overview was then given on the developments of the detection of crop water and nitrogen status by remote sensing. Finally, the current research highlight, the existing difficulties, and the future development trends and the prospect of remote sensing of crop water and nitrogen status were discussed.