Mr. Zhang, Shangqiu, Henan: How to return corn stalks? Will it not be applied after the return of the field?
Expert: Straw returning method: After manually removing the ear of corn, use the returning machine to smash the straw into a small section of no more than 10 cm, spread it evenly on the ground, and then rotate it with a disc harrow or a rotary tiller. The straw is evenly distributed in the 0-10 cm soil layer, and the deep tillage is carried out before sowing to create conditions for sowing. Note that before the soil is introduced, an appropriate amount of nitrogen fertilizer (about 5 kg of urea per mu) should be added to adjust the carbon to nitrogen ratio of the straw to accelerate the straw maturity. Otherwise, not only the straw is hard to rot, but also competes with the crop for nutrients and yellow seedlings. The average corn stover contains potassium (K2O) of 1.42%. If it is returned to 400 kg per mu, it is equivalent to applying 9.5 kg of potassium chloride. However, the potassium in the straw can only be released and used by the crop after being rotted. Therefore, it is necessary to carry out the straw returning to the field for many years, and apply the appropriate amount of potassium fertilizer in the first few years, but the application amount can be reduced year by year.
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