What are the fertilizer requirements of soybeans?
2021-02-18 15:20:10
Soybean is a crop that requires more fertilizer. For every 100 kilograms of soybean seeds produced and their corresponding stems, leaves, and oyster shells, it is necessary to absorb 5.3-7.2 kg of nitrogen, 1.0-1.8 kg of phosphorus pentoxide and 1.3-4.0 kg of potassium oxide. Soybeans absorb more nitrogen, phosphorus, and potassium than rice and wheat. The content of nitrogen in soybean seeds is more than twice that of wheat, which is more than four times that of rice. The amount of phosphorus is 30% more than wheat and 40% more than rice. The potassium content is more than twice that of wheat and four times that of rice. . Soybeans have different fertilizer application at different growth stages: from the emergence to the initial flowering period, the absorption of three elements accounts for 25-33% of the total; from the flowering stage to the drumstick stage, it is the peak period of absorption and the amount of nitrogen absorption is the total amount. Of the 54.6%, phosphorus absorption accounted for 51.9% and potassium absorption accounted for 61.9%. After the drumsticks, the absorption of nitrogen and potassium is greatly reduced, but the absorption of phosphorus has not yet stopped. Therefore, the application of soybean fertilizer should be based on organic fertilizer as the base fertilizer, and the application of available nitrogen and phosphorus fertilizers at seedling stage and early flowering stage should have good effects on soybean branching, flower bud differentiation and flowering and scarring.
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