Retaining sorghum at the time of wheat harvest is the easiest and most effective way to increase the production of fertilizers. It has been widely used for many years. According to measurements, wheat straw contains 0.4 to 0.6% N, 0.2 to 1.4% P2O5, and 0.5 to 0.9% K2O, and also contains trace elements. After wheat straw is returned to the field, it will not only directly provide nutrients to the soil, but also improve soil structure, increase soil water storage and soil conservation capacity, indirectly increase soil fertility and increase soil organic matter content. According to a consecutive four-year high wheat stubble test, the soil organic matter was determined. The amount of soil organic matter remaining was gradually increased from 8.8 g/kg to 10.6 g/kg, while the organic matter remained undisturbed was still 8.2 g/kg. The increase of soil organic matter content by 1.8 grams per kilogram over four years shows that high stubble retention in wheat is the most scientific way to increase fertility by solving the current shortage of agricultural fertilizer, summer harvesting and summer sowing, and buffering labor and material resources. It is also an effective measure to implement ecological agriculture. According to many years of field experiments, 15 cm of sorghum were left, about 150 kg of stubble were left in the mu, 20 cm of sorghum were left, 175 kg of straw were left in the mu, 25 cm of sorghum was left, and 250 kg of stalks were left in the mu. 5 to 10 centimeters, only 80 to 130 kilograms of stalks are returned. From the perspective of yield increase, it is best to increase the yield by 15 to 20 cm. Retaining 15-20 cm more than the conventional stubble yield of 23.1 kg of wheat per acre, an increase of 9.8%.
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