Method of determining nitrogen fertilizer application in crops

Abstract

The invention discloses a method of determining nitrogen fertilizer application in crops, which can determine the nitrogen fertilizer application Nfert of the crops according to the quantitative relation of nitrogen fertilizer, soil nitrogen and nitrogen uptake by the crop at the crop root zone. The method can realize quick, accurate and quantitative nitrogen fertilizer application without testing the soil or plants, so that the cost for determining the nitrogen fertilizer application in the production is greatly saved.

Description

technical field [0001] The technical field of agriculture of the present invention particularly relates to a method for determining the amount of nitrogen applied to crops. Background technique [0002] There is still no theoretical breakthrough in the method of determining the amount of nitrogen application to obtain the target yield and reduce environmental pollution in agricultural production. Although methods such as the fertilizer effect function method focusing on field test biostatistics and soil testing and fertilization methods (such as soil fertility abundance index method and nutrient balance method) that emphasize soil testing have been developed at home and abroad, these methods are based on input-output relationship to determine nitrogen application rates, essentially treating the soil-crop system as a "black box". The essential issues of nitrogen transformation, flow and loss between soil-crop-environment have not been touched. [0003] The determination met...

AI Technical Summary

Problems solved by technology

The determination method based on soil testing first encounters the problem of finding reliable test indicators. So far, no practical indicators that can reflect the nitrogen supply of paddy field soil have been found. Although the dry farming system can use the nitrate nitrogen storage in the root zone soil layer as index, but there are also problems such as large space-time variation, strong mobility, and large sampling and measurement errors; secondly, the problem of converting the test value into the amount of nitrogen fertilizer application. In this conversion process, a series of parameters need to be introduced, and the selection of these parameters Uncertainty often leads to the calculated fertilization amount not being realistic, or even inferior to the amount determined by expert experience through the so-called "slapping the head", which limits the applicability of these methods in practice

Leading to the blind application of nitrogen fertilizer in actual production, causing serious environmental pollution and other problems

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