Total deep plowing returning-to-field method for promoting rot of rice straw in northern cold areas

Abstract

The invention discloses a total deep plowing returning-to-field method for promoting rot of rice straw in northern cold areas. The method comprises the following steps that S1, rice is harvested mechanically after maturing, straw is crushed by a harvester for the first time, scattered on the ground and crushed for the second time with a stubble cleaner, the length of the crushed straw is less than15 centimeters; S2, an aqueous urea solution is sprayed on the surface of the straw; S3, a traction turnover moldboard plow overturns and buries the rice straw into the ground below 25 centimeters. The total deep plowing returning-to-field method for promoting the rot of the rice straw in the northern cold areas has the advantages that by improving the crushing degree of the straw, adjusting C / Nof the straw and increasing the overturning and burying depth, the decomposition speed of the straw can be quickened, the straw returns to the deep field, the paddy field operation and rice growth anddevelopment in the next year are not affected, the cyclic utilization of the straw is achieved, the agricultural non-point source pollution is reduced, the soil fertility is increased, the agricultural sustainable development is maintained, and the social and ecological benefits are significant.

Description

technical field [0001] The invention relates to the field of agricultural technology, in particular to a method for deep plowing and returning rice straws to fields in a cold area in northern China. Background technique [0002] Rice is one of the three major food crops in the world, and it is also the most important food crop in China. China is the largest rice producer in the world, and its total output ranks first in the world. From 1961 to 2013, the average annual rice planting area in China was 32 million ha 2 , accounting for 34.97% of the average planting area of ​​grain crops in my country, and the rice planting area in the northern region accounts for about 20% of the rice area in my country. [0003] The rice-to-grain ratio of rice is 1:1.1-1.2. The rice output in the northern cold area is 500-600 kg / mu, and the rice straw output is 600-700 kg / mu. The effective accumulated temperature in the northern cold area is low, and the straw decomposes slowly. Afterwards, i...

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Problems solved by technology

[0003] The rice-to-grain ratio of rice is 1:1.1-1.2. The yield of rice in the northern cold area is 500-600 kg / mu, and the output of rice straw is 600-700 kg / mu. The effective accumulated temperature in the northern cold area is low, the decomposition of straw is slow, and the rice straw is returned to the field Afterwards, it will adversely affect the growth and development of rice in the second year. Therefore, after the rice is harvested every autumn, farmers burn the straw in the field, causing serious environmental pollution and threatening human food safety and health.

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