Soybean enters the spurt period, vegetative growth has basically stopped, reproductive growth is in a vigorous period, organic nutrient in the plant body is running to the grain, and the grain enlarges gradually, which is the period when soybean accumulates dry matter.
During this period, soybeans require more phosphorus and potassium fertilizers. During this period, these nutrients are taken from the soil below the tillage layer by the roots, and the nutrient conversion and release capacity of the soil below the tillage layer is weak, which leads to soybean nutrient. The demand does not harmonize with the soil fertility. It is prone to malnutrition and premature aging, which has become a major factor limiting the high yield of soybeans.
In the management of soybean grain size, extra-root fertilizer application should be carried out to alleviate the contradiction between soybean requirement fertilizer and fertilizer supply and accelerate the accumulation, transformation and transportation of assimilation products. It can promote the translocation of nutrients to grains, reduce and avoid pods, promote full grain, increase grain weight, and increase yield.
Soybean flowering begins and the absorption of phosphorus increases until it reaches maturity. Potassium can mainly regulate the physiology and biochemical function of plants, and cooperate with phosphorus in the late growth stage of soybean, accelerate the conversion of the material into a storage form, and promote grain swelling. Boron promotes the development of soybean meal and reduces the loss of loquat. Therefore, 0.5% urea, 0.3% potassium dihydrogen phosphate, and 0.1% borax were sprayed outside the root of the soybean grain during the grain-granulosa period, and then sprayed once every 7 days. This has a significant effect on reducing pods, increasing grain weight, and increasing yield.
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