Amount-decreased chemical fertilizer deep application method based on reducing rice field nitrogen and phosphor non-point source pollution

Abstract

The invention discloses an amount-decreased chemical fertilizer deep application method based on reducing rice field nitrogen and phosphor non-point source pollution. The method comprises the following steps: 1) determining the target yield of an amount-decreased chemical fertilizer deep application method of rice; 2) determining N, P and K nutrient quantity demands under the target yield; and 3) determining the fertilization application amount under the target yield; 4) applying chemical fertilizers: applying hole applied fertilizers and base fertilizers as fertilizers for early and late rice, wherein as for the hole applied fertilizers for early rice, the N fertilizer dosage is 25-30kg N / ha and the P fertilizer dosage is 25-30kg P2O5 / ha; as for the hole applied fertilizers for late rice, the N fertilizer dosage is 30kg N / ha; the base fertilizer dosages of early and later rice are equal to the fertilization application amounts under target yields of early and late rice minus the hole applied fertilizer dosages of early and late rice; the hole applied fertilizers of early and later rice are applied before rice transplanting in a spread manner, and the base fertilizers are prepared into fertilizer balls which are applied deep after rice transplanting. The method is capable of reducing the rice field nitrogen and phosphor non-point source pollution to a great extent and improving the fertilizer utilization efficiency, is high in operability in production, low in investment cost and relatively high in popularization and application value.

Description

technical field

[0001] The invention relates to the technical field of crop fertilization, in particular to a method for reducing the amount of chemical fertilizers and deep application based on reducing nitrogen and phosphorus non-point source pollution in paddy fields, which is suitable for reducing nitrogen and phosphorus in paddy fields under the premise of reducing the application of chemical fertilizers in successive years and maintaining stable yields for double-cropping rice in southern my country. Phosphorus non-point source pollution. Background technique

[0002] Rice is an important food crop in my country. At present, my country's rice planting area accounts for about 20% of the world's rice planting area, and rice nitrogen fertilizer consumption accounts for 37% of the world's total rice nitrogen fertilizer use. The average amount of nitrogen fertilizer used in a single season in rice fields in my country is as high as 180kghm -2 , this amount is about 75% hig...

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