Corn was planted in field under different treatments of fertilizer application

and indices of corn growth shape

fluorescence spectra

laser induced fluorescence spectra of live leaves as well as fluorescence spectra of the extracting solution of leaves were measured in the different growth stages. The results showed: 1) different conditions of fertilizer application not only are expressed in corn growth vigors

but also affected the efficiency of photosynthesis and the content of chloro-phyl as well as the fluorescence spectra of corn

2) peak intensities of 440nm

550nm and 685 nm can be used to monitor the nutrient supplying condition of corn

and it will be better to use ratios of those peak intensities. The study provided a new approach and reliable basis for monitoring the growth shape and estimating the yield of corn using laser induced fluorescence technology of remote sensing. The optimum monitoring period is jointing stage of corn due to the requirment of fertilizer

farming season

disparity of fluorescence spectra as well as the possibility of remote sensing.