Fourth, how to carry out the direct return of rice to the soil The nutrient that rice absorbs from the soil, the ratio of remaining in the straw is probably nitrogen 30%, phosphorus 20%, potassium 80%, calcium 90%, magnesium 50%, silicon 80%, That is to say, straw contains higher nutrients, especially potassium and silicon. Potassium oxide is 1.13% to 3.66% with an average of 1.83%; silica is 5.3% to 15.0% with an average of about 11.0%, and rice straw is easily rotted. Therefore, rice straw returning is the most effective fertilization method for paddy field. The method of returning to field: the straw is crushed or broken with a lawn machine, the length is 16-23 cm; the crushed or broken good straw is evenly spread on the field surface, generally about 666.7 m2 and 300 kg of returning field; When the soil moisture content is 25%-30% (without car), the rice straw is turned into 15cm soil layer. The coverage of the straw in the plough layer is greater than 95%; before fertilization, fertilization is applied, and nitrogen is applied every 666.7m. Phosphate fertilizer 15-20 kg, nitrogen and phosphorus ratio of 3:1. Depression: The appropriate moisture content in the depression is 19%-23%.耙 耙 , , , , , , 耙 耙 耙 耙 耙 耙 耙 耙 耙 耙 耙 耙 耙 耙 耙 耙 耙 耙There are no large soil blocks in the rear plow layer, and the maximum size of the soil block larger than 5 cm per square meter is less than or equal to 5 pieces. The slurry management after straw returning: As a large amount of fresh straw organic matter enters the soil and decomposes under flooding conditions, the paddy soil will have a strong reduction effect, especially at the stage of vigorous decomposition of the straw. In order to prevent the accumulation of a large number of reducing substances and organic acids in paddy soils, which have caused toxic effects on the growth of rice roots, water slurry management in water-logged fields and intermittent irrigation is used.
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