The invention provides a rice
nitrogen fertilizer recommendation method based on a
multispectral image of a fixed-wing unmanned aerial vehicle based on
spectral data of the image of the fixed-wing unmanned aerial vehicle, which is used for recommending the
nitrogen fertilizer application amount in a key growth period of rice topdressing. Through a rice field test, a
rice plant nitrogen accumulation amount monitoring model is constructed, and a
time sequence spectrum dynamic curve of the unmanned aerial vehicle is fitted. And a sufficient index
nitrogen fertilizer recommendation
algorithm is constructed by using the model and the curve, and the
algorithm is verified through an independent test. According to the method, the
spectral data characteristics of an unmanned aerial vehicle platform are fully considered, the nitrogen
nutrition status of the rice in the key growth period can be accurately and nondestructively monitored through sensitive
vegetation index screening and optimal
curve fitting methods, and finally the accurate
nitrogen fertilizer recommendation amount is given through the sufficient index
algorithm in combination with the monitoring result and the unmanned aerial vehicle spectral characteristics. According to the method, an optimization approach is provided for precise nitrogen management of the rice, and important theoretical basis and
technical support are provided for precise
agricultural management and decision-making of a regional scale.