ASABE Technical Library - Abstract

Abstract.Quick access to crop growth is the basis of variable fertilization and precision agriculture. Gathering crops Information with spectral method israpid, non-destructive, which can satisfy the requirement of precision agriculture. The spectral technology was used to detect the chlorophyll content in the field, a field experiment was conducted on April 3, 2014. The area was in 1.5m X 30m. And the experimental subjects includes three kinds of winter wheat: Jimai22, Luyuan502, Tainong18. They were at jointing stage.Firstly, measure the winter wheat’s reflectance spectrum there times using spectrometer (ASD Inc). The range of wavelength is 325nm to 1075nm. Secondly measure the SPAD (Soil and Plant Analyzer Development) data of winter wheat’s top leaf and bottom leaf in the same site. The collected spectral data of winter wheat is applied to the analysis of crop growth. And the data of SPAD is used as the index of crop chlorophyll content, which is one of the important indicators of crop condition. The correlation coefficient between spectral data and SPAD data was calculated. The wavelengths were selected including 487 nm, 542 nm, 680 nm, 721 nm, 761 nm. A multiple linear regression module was established that the predicting and testing correlation coefficient were 0.5898 and 0.4580 separately.