Spatial Variability and Relationship of Spectral Reflectance and Growth Status to Corn Canopy in the Different Growth Stage

摘要

In order to finding a convenient way of acquiring chlorophyll spatial distribution in different growth stage, the canopy reflectance of corn seedling and the relationship between the spectral reflectance of corn seeding and growth were analyzed. The results indicated that the spatial variability of the canopy chlorophyll content of corn was variant in different growth stages. The variance was not reformed over the growth stages. There are not high correlations between chlorophyll content and RVI. The chlorophyll content showed better correlations on with NDVI and with reflectance of 550nm. Focus on the relationship between reflectance of 550nm and chlorophyll, it can be found that the correlation coefficient was about 0.88～0.69. It reached highest before five leaves. It showed that the reflectance on 550nm may characterize the amount of chlorophyll. It could help to guide the fertilization during the growth stages of corn.