In the season of winter and spring, the cultivation of green manure has obvious effect on soil improvement. Specifically: First, it can provide a rich nutrient for the soil. The young shoots 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, magnesium and various trace elements in the soil. For every kilogram of green manure, it is generally available for 6.3 kg of nitrogen, 5 kg of phosphorus, and 5 kg of potassium, equivalent to 13.7 kg of urea, 6 kg of superphosphate and 10 kg of potassium sulfate. The second is to transform the insoluble nutrients in the soil and facilitate the absorption and utilization of crops. The secretion of green manure crops during the growth process and the organic acids produced by decomposition after overturning can convert the insoluble P and K in the soil into effective P and K that can be used by crops. The third is to improve the physical and chemical properties of the soil. After the green manure is turned into soil and continuously decomposed under the action of microorganisms, in addition to releasing a large amount of effective nutrients, humus is also formed. The combination of humus and calcium enables the soil to be cemented into agglomerate structure, maintains water and fertility, and regulates water and fertilizer. The good performance of gas and heat is conducive to the growth of crops, and the fourth is to promote the activity of soil microorganisms. After the green manure is applied to the soil, fresh organic energy substances are added, so that the microorganisms can multiply rapidly and their activities increase, and the formation of humus and nutrients can be effectively promoted, and soil ripening can be accelerated.
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