According to foreign data reports, soybeans are sprayed at the roots during the scab and grain stage, and the grain yield is increased by more than 50%. According to tests conducted by the Xiongyue Agricultural College, the soybean seedlings and shoots were sprayed with nutrient solution, and the grain yield increased by 32.06% to 54.01%. The effect of extra-root-spraying fertilizer on soybean production in late growth stage was significant, which was related to the characteristics of soybean sorptive fertilizer and soil nutrient supply rules. Soybean root uptake with the plant growth and development to the deep layer of the soil, that is, soybean in the early period of the main absorption of nutrients in the soil, the late reproductive period (reproductive growth) mainly absorb the nutrients in the soil below the tillage layer. According to the test, the percentage of deep nutrient uptake by soybean roots in soybeans is 93.3% at the seedling stage, 62.9% at the branching stage, 36.1% at the flowering stage, 26.2% at the stage of pods, and the root system can hardly use 10 cm at the grain stage. The nutrients in the deep soil, and the amount of nitrogen, phosphorus, and potassium required for flowering, grain, and ripening period accounts for about 80% of the total amount. This shows that the peak period of soybean need to be in the reproductive growth stage, that is, in the late growth period. These nutrients are taken from the soil below the plough layer by the roots, and the nutrient transformation and release capacity of the soil below the plough layer is much lower than that of the tillage layer, which leads to the inconsistency between the demand for nutrients during the peak period of soybean requirement and the soil fertility supply capacity. Sex. Soybean roots (especially lateral roots) are mainly concentrated in the surface soil and are prone to nutrient deficiency and premature senescence in the late middle and late reproductive periods, which has become a major factor limiting the high and stable yield of soybean. Therefore, spraying the nutrient solution outside the root of the soybean seedlings can alleviate the contradiction between the peak demand of soybean and soil fertility, accelerate the accumulation, transformation, and transportation of assimilation products, and at the same time promote the nitrogen fixation and root system of the rhizobia. Vitality, improve root intake of nutrients. The preparation method of the nutrient solution is: weigh 0.5 kg of urea, 105 g of superphosphate, 107.5 g of potassium sulfate, 12.5 g of boric acid, dissolve in 25 kg of water, and filter it as a nutrient solution. The foliar spraying should be carried out after 4:00 pm or in the evening, so that the leaves are evenly stained with nutrient solution and do not flow, and even spray three times, each time interval of 3-4 days.
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