Five practical techniques of returning Rice Straw to Field

1. Technology of short-cut rice straw ploughing and returning to field. The straw is cut manually or mechanically to grow 15cm to 20cm and spread evenly in the rice field. Generally, the amount of dry straw per mu is 200,250 kg, and if early rice straw is returned to the field, the amount of dry straw per mu is 1 × 2 or 2 / mu. After spreading rice straw, on the basis of the original amount of fertilizer, 8: 12 kg of ammonium bicarbonate or 5: 6 kg of urea should be applied as base fertilizer per mu; in the case of cold-soaked fields, 15-25 kg of lime should be applied per mu to accelerate the soft rot of rice straw. Finally, the straw was ploughed and buried, keeping the 3-5 cm deep water layer for 5-6 days.

two。 The technology of rice straw short-cutting and ploughing and biological rot returning to the field. The rice straw grew 15 cm artificially or mechanically and evenly sprinkled 200 kg of dry straw per mu. If early rice straw was returned to the field, the field application rate per mu was 1 × 2 or 2 kg of the total straw per mu, and then evenly sprinkled with fine soil mixed with 1 kg / mu and 2 kg / mu, at the same time, on the basis of the original fertilizer per mu. Add 8-12 kg of ammonium bicarbonate or 5-6 kg of urea as base fertilizer and keep 2-3 cm deep water layer in the field for 5-8 days after ploughing.

3. The technology of returning rotten rice straw to the field with decaying agents. Soak dried straw with water so that its water content reaches 60%-70%, spray 1.5kg of accelerant in layers for every 1000 kg of dried straw (dissolved by 100kg of water, the following agents are the same), or 2kg of rotten straw, or 301kg of bacterial agent 1kg plus 5kg of urine and feces. The method is as follows: the soaked rice straw is layered (each layer is about 10 cm thick) and sprayed layer by layer to make a trapezoidal fertilizer pile with a length of 2.5 meters, a width of 1.5 meters and a height of about 1.5 meters. The surface of the pile is tightly sealed with mud (covered with plastic film in winter) to ferment; it can be completely cooked and ready for use after 8-15 days in summer and 15-25 days in winter.

4. Technology of returning rice straw with enzyme bacteria to the field. First soak the dried straw with water so that its water content reaches 60%-70%, and compost it according to the formula of 1000 kg of dried straw, 50 kg of rice bran and 5 kg of enzyme bacteria. The specific method is to spread the soaked straw on the ground into a thickness of 10 cm to 15 cm, then spread enzyme bacteria and rice bran evenly on the straw, so as to stack it layer by layer, and finally grow a trapezoidal fertilizer pile of 2 to 2.5 meters, 1.5 meters wide and 1.5 meters high. The surface of the pile is then sealed with mud (covered with plastic film in winter) for fermentation. Generally, it can mature in 10-15 days in summer and 20-25 days in winter.

5. The technology of returning straw to the field. It is mainly used for dry crops such as fruit trees and vegetables. The method is to cover the rows and borders of the crops with dry or soaked straw, which is generally 2 to 3 centimeters thick; if possible, it is best to cover the straw with a layer of fine soil. This method is simple and the effect of drought prevention is good. It should be noted that the thickness of straw mulching at seedling stage should be controlled so as not to affect the growth of seedlings, and sufficient basal fertilizer should be applied before field crop mulching, so as not to cause fertilizer deficiency in the later stage.