Fertilizer characteristics of soybean

Soy is a crop that requires more fertilizer. For each 100 kg of soybean seeds produced and their corresponding stems, leaves, pods, etc., 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 much more nitrogen, phosphorus and potassium than rice and wheat. The nitrogen content of soybean seeds is more than twice that of wheat, which is more than 4 times that of rice. The phosphorus content is 30% more than wheat and 40% more than that of rice. The potassium content is more than twice that of wheat and more than 4 times that of rice. . Soybean fertilization in different growth stages is different: from the emergence to the beginning of flowering, the absorption of three factors accounts for 25-33% of the total; from the initial flowering period to the buccal period is the peak period of absorption, and the amount of nitrogen absorption accounts for the total amount. 54.6%, phosphorus absorption accounted for 51.9%, and potassium absorption accounted for 61.9%. After the drum, the absorption of nitrogen and potassium is greatly reduced, but the absorption of phosphorus has not stopped. Therefore, soybean fertilization should be based on the use of organic fertilizer as the base fertilizer. The seedling stage and the early flowering stage should be combined with the application of available nitrogen and phosphate fertilizer, which have a good effect on soybean branching, flower bud differentiation and flowering and pod formation.
Huaxian Agricultural Technology Promotion Center Lu Shuguang

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