Method for fertilizing plough layer of soil by straw returning to field

Abstract

The invention belongs to the technical field of soil fertilization and provides a method for fertilizing a plough layer of soil by straw returning to field. The method comprises the following steps: (1) in a first year of straw returning, turning straw into soil along with autumn soil preparation at a turning depth of 40-50 cm; (2) in a second year of straw returning, turning straw into soil along with autumn soil preparation at a turning depth of 30-35 cm; (3) in a third year of straw returning, turning straw into soil along with autumn soil preparation at a turning depth of 15-20 cm; and (4) taking steps (1)-(3) as a cycle and returning straw to field according to the sequence. The method for fertilizing a plough layer of soil by straw returning to field can significantly improve the crop yield. The method enables an average yield of corn to be 10762 kg / hm<2> in a test period and the yield is increased by 64.76% compared with no-tillage. The method enables an average yield of soybeans to be 3330 kg / hm<2> and the yield is increased by 34.93% compared with no-tillage.

Description

technical field [0001] The invention relates to the technical field of soil fertilization, in particular to a method for returning straw to the field to fertilize the soil plow layer. Background technique [0002] The black soil in Northeast my country is one of the most fertile soils in the world. The soil environment is of good quality and suitable for the production of high-quality agricultural products. The black land in Northeast China is the ballast of my country's food security. The grain output accounts for 1 / 4 of the country's total, the commercial grain accounts for 1 / 4 of the country's total, and the transferred grain accounts for 1 / 3 of the country's total. The development of black land began in the late Qing Dynasty, and the reclamation was very slow. The first large-scale reclamation began in the late 1950s and early 1960s. In the early stage of reclamation, it was mistakenly believed that the fertile black land could be continuously used without any input, an...

AI Technical Summary

Problems solved by technology

However, after the straw mixed soil is returned to the field, it may not necessarily be able to retain water and moisture and improve the soil structure.

For example, when the depth of straw returning to the field is too shallow, it will not only fail to increase soil nutrients, but will also easily run away moisture and accelerate the loss of original nutrients

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