Corn straw returning technology
First, the carbon-nitrogen ratio of corn stover is 65-85:1, and the ratio of carbon to nitrogen that is suitable for microbial activity is 25:1. After the straw is returned to the field, the nitrogen in the soil is insufficient, and the microorganism competes with the crop for nitrogen. The wheat seedlings will suffer from nitrogen deficiency. Yellow, thin, poor growth. Solution: After the straw is crushed, spread 50 kg of ammonium bicarbonate or 20 kg of urea per acre on the surface of the straw, and then plow.
Second, anti-stalk crushed too thick. Some crushed stalks are too long and their length is less than 5 centimeters and more than 10 centimeters, which is not conducive to ploughing and affecting sowing. Solution: Use a large straw crusher with a relatively large horsepower, so that the straw is finely crushed, and the rotation is deeper, and the straw is evenly mixed with the soil.
Third, after the straw is returned to the field, the soil is too loose, large pores, wheat seeds can not be in close contact with the soil, affecting the germination and growth, root is not strong, and even "hanging root" phenomenon. To solve this problem, in addition to improving the quality of straw smash, we must pay attention to the following aspects: (1) Apply enough nitrogen, phosphorus and potassium fertilizers. (2) Improve soil moisture. (3) Improve the quality of sowing. (4) Timely suppression and watering. After wheat sowing, it was air-dried for 1 day and was pressed with Dendrobium to densify the soil.
In addition, the diseased straw can not be returned directly to the field, otherwise the summer corn is prone to disease. This kind of straw should be destroyed or put into the farmland after high-temperature composting.
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