Rice nitrogen fertilizer recommendation method based on multispectral image of fixed-wing unmanned aerial vehicle

Abstract

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.

Description

technical field [0001] The invention belongs to the field of precise regulation and control of crop nitrogen fertilizers, in particular to a method for recommending rice nitrogen fertilizers based on multi-spectral images of fixed-wing unmanned aerial vehicles. Background technique [0002] China is a major rice production and consumption country in the world, and the stable production of rice is of great significance to ensure the food security and the stability of the food market in our country. Nitrogen is one of the important nutrients that limit rice yield. Therefore, in order to ensure high yield, farmers often apply excessive nitrogen fertilizer, resulting in fertilizer waste and environmental pollution. To improve this situation, agronomists are working to develop targeted nitrogen fertilizer recommendations for different crops. [0003] The first step in crop nitrogen fertilizer regulation is to diagnose crop nitrogen nutrition status in real time. Traditional ni...

AI Technical Summary

Problems solved by technology

Some studies lack the screening of reflectance of crops sensitive to nitrogen index bands, and cannot construct a vegetation index with better estimation accuracy; in addition, the existing nitrogen fertilizer regulation is mostly based on handheld platforms, which do not have efficiency advantages in practical applications. The fixed-wing UAV used in the invention is a relatively new UAV platform with higher speed and better endurance. It has great potential in large-scale farmland management and needs to be built for this platform. Reliable Nitrogen Fertilizer Recommendations

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