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在田间栽种玉米,并按氮、磷肥的不同施用量分为10种情况处理。在不同生长期进行了生长形态指标测量和活体叶片的荧光光谱与激光诱导荧光光谱测量,并测试了叶片浸出液的荧光光谱。结果表明,不同的施肥条件.不仅使玉米在长势上有所反映,而且还会引起光合作用效率和叶绿素含量等的变化,因而导致了玉米叶片荧光光谱的变化。利用440,550,685nm等处的荧光强度可探测玉米的养分供应状况,当利用它们的比值时,表征更为明显。这就为遥感监测玉米的长势和估产提供了新的途径和可靠依据。从玉米的需肥情况、农时、荧光光谱的差异性以及遥感的可行性来看,在拔节期是遥感监测的最佳时期。
Corn planted in the field, and according to nitrogen, phosphate fertilizer application rate is divided into 10 cases. Growth morphological indexes were measured at different growth stages and fluorescence spectra and laser-induced fluorescence spectra of living leaves were measured. Fluorescence spectra of leaf leachate were also tested. The results showed that different fertilization conditions not only reflected the growth of maize, but also caused changes of photosynthesis efficiency and chlorophyll content, which led to the changes of fluorescence spectra of maize leaves. The fluorescence intensity at 440, 550, 685 nm etc. can be used to detect the nutrient supply status of corn, and the characterization is more obvious when their ratio is used. This provides a new way and a reliable basis for monitoring the growth of maize and estimating yield. From the corn needs of fertilizer situation, agricultural time, the difference of fluorescence spectra and the feasibility of remote sensing point of view, is the best time for remote sensing monitoring.