Green manure improves soil

First, it can provide rich nutrients for the soil. The young stems and leaves of various green manures are rich in nutrients. Once they are decomposed in the soil, they can greatly increase the organic matter and nitrogen, phosphorus, potassium, calcium, magnesium and various trace elements in the soil. Every kilogram of green manure fresh grass, generally available for nitrogen 6.3 kg, phosphorus 1.3 kg, potassium 5 kg, equivalent to 13.7 kg urea, 6 kg superphosphate and 10 kg potassium sulfate. The root system of the green manure crop is developed. If the ground part produces 1,000 kilograms of fresh grass, the underground root system has 150 kilograms, which can increase soil organic matter, improve soil structure and improve soil fertility. Legume green manure crops can also increase nitrogen in the soil. It is estimated that 2/3 of the nitrogen in legume green manure comes from the air.

Second, it can transform the poorly soluble nutrients in the soil to facilitate the absorption and utilization of crops. The secretion of green manure crops during growth and the organic acids produced by decomposition after tumbling can convert the insoluble phosphorus and potassium in the soil into the availability of phosphorus and potassium.

Third, it can improve the physical and chemical properties of the soil. After the green manure is turned into the soil, it is continuously decomposed under the action of microorganisms. In addition to releasing a large amount of effective nutrients, it also forms humus. The combination of humus and calcium can make the soil cement into agglomerate structure, and the soil with agglomerate structure is loose, breathable and water-retaining. It has strong fertility and good performance in regulating water, fertilizer, gas and heat, which is conducive to crop growth.

Fourth, promote soil microbial activities. After the green manure is applied to the soil, the fresh organic energy materials are added, so that the microorganisms can rapidly multiply and the activities are enhanced, and the formation of humus and the effective nutrient are promoted, and the soil ripening is accelerated.
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