After the soybean enters the grain-filling period, the demand for phosphorus and potassium fertilizers increases, but the nutrient conversion and release capacity below the soil layer during this period weakens, causing the soybean nutrient demand and the soil fertilizer supply capacity to be inconsistent, leading to premature aging of soybeans. The effect of extra-root fertilizer application in the soybean grain-bearing period is good, which can alleviate the contradiction between soybean requirement fertilizer and fertilizer supply, accelerating the accumulation and transformation of assimilation products, promoting grain filling and increasing grain weight. The specific method is: spraying with 0.5% urea, 0.3% potassium dihydrogen phosphate, 0.1% borax, spraying once every 7 days, and even spraying 2 times.
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