Red earth rice field reduced fertilizer application method based on target yield

Abstract

The invention discloses a red earth rice field reduced fertilizer application method based on a target yield. The method includes the steps that (1) 95-105 percent of annual output of double cropping rice in recent five years serves as the target yield; (2) according to recommendation of an area research result, 90-100 percent of fertilizing amount serves as area average proper fertilizing amount; (3) organic fertilizer is applied, wherein farmland organic matter resources obtained by that straw is abandoned in fields and milk vetch is plowed and returned to the fields serve as organic fertilizer to replace chemical fertilizer, replaceable amount of nutrients of the organic resources is calculated according to the nutrient amount of N, P and K respectively being 0.826%, 0.119% and 1.708% in dry matter of the straw and the nutrient amount of N, P and K respectively being 3.085%, 0.301%, 2.065% in dry matter of the milk vetch, corresponding chemical nutrients are all replaced by P and K in the straw and the milk vetch after the straw and the milk vetch are returned to the fields, half amount of N contained in organic matter is used for replacing the amount of the corresponding chemical nutrient, and the reduced application amount of the chemical fertilizer is obtained; (4) the chemical fertilizer is applied, wherein the area average proper fertilizing amount minus chemical nutrient replacement amount is equal to applying quantity of the chemical fertilizer in the reduced fertilizer application method. Increased extra labor force for farmland organic waste utilization is quite little, and the method is easy and convenient to operate and easy to popularize.

Description

technical field [0001] The invention relates to the technical field of fertilizer utilization efficiency, and more specifically relates to a method for reducing chemical fertilizer application in red soil paddy fields based on target yield, which is suitable for efficient utilization of organic resources in paddy fields to replace chemical fertilizers and reduce non-point source pollution. Background technique [0002] At present, there are two outstanding problems in the application of fertilizers in rice cultivation, one is the excessive application of chemical fertilizers and its lower nutrient use efficiency, and the other is the resulting environmental pollution. How to improve the utilization efficiency of chemical fertilizers and reduce agricultural non-point source pollution is a key issue in the research fields of food security and ecological environment in my country. The improvement of chemical fertilizer utilization efficiency has mainly gone through two stages o...

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Problems solved by technology

[0006] The above-mentioned published articles did not involve specific fertilizer reduction programs, but only evaluated the effects of carbon, nitrogen fixation, and nitrogen use efficiency under reduced fertilizer application, but did not comment on the effects of reduced PK nutrients, let alone chemical fertilizers The method basis for reducing fertilizer application, that is, the method of reducing fertilizer application based on the target yield (regional target yield), and there is a lack of specific implementation methods for the method of reducing fertilizer application in the region

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