Abstract: Using DJI P4 Multispectral UAV, the spectral data of maize in the whole growth period were obtained and the growth status was monitored in 3 experimental fields with different maize varieties in Anning, Kunming, Yunnan. Based on the spectral data, the normalized difference vegetation index （NDVI） of corn was constructed to evaluate the growth of corn. The results showed that the maize variety LD556 of test plot 1 in the five different growth stages of maize was better than the maize varieties of the other two test plots （XL, JD16）, and the mean and maximum values of NDVI of test plot 1 were higher than those of the other two test plots. In this paper, compared with the traditional ground monitoring, the corn growth monitoring test by multi spectral UAV was more rapid and efficient, which could greatly reduce the financial and human costs, and also promote the development of precision agriculture to a certain extent.

Key words: corn, UAV remote sensing technology, multispectral, growth monitoring