From the point of view of soybean requirement fertilizer, soybean differentiation from flower bud to initial flowering stage is a period of vegetative growth and reproductive growth, and it is also a time when soybean plants need a lot of nutrition. Under high-yield cultivation conditions, soil fertility alone and applied basal and seed fertilizers often fail to meet the requirements. During the period from the sowing of soybean to the initial flowering period, there is a clear effect of increasing yield. In particular, the soil fertility is low, and the early growth of soybeans is thin, and the ridges cannot be sealed. The effect of top dressing is even more pronounced. Soybean yield of 75 kg of urea per hectare and 37.5 kg of potassium sulfate can increase soybean production by 21.9%. However, in the case of more fertile soil, or in the case of basal fertility and seed fertilizer, soybean plants will grow vigorously. When they are relatively luxuriant, they are not suitable for root dressing, and nitrogen topdressing is not suitable. Otherwise, it will cause lodging and yield reduction. Available fertilizers can be used as top dressings, for example: urea, ammonium nitrate, potassium sulfate, potassium chloride, etc. Soybeans are top-dressed at the beginning of the flowering period and are dominated by nitrogen fertilizers. Phosphate fertilizers and potash fertilizers can be used in combination. Generally, 37.5-75 kg of urea or 150 kg of ammonium sulfate can be topdressed per hectare, followed by applying 75-150 kg of potassium chloride or potassium sulfate and 112.5-150 kg of superphosphate. The top dressing is usually combined with cultivating and weeding. After weeding, the ridges (distances of 5 to 10 cm from the plants) are ditched, and the ditch is 5 to 10 cm deep. The fertilizer is evenly applied to the ditch, and the soil is immediately applied to prevent nitrogen. Volatile losses, pay attention to rotating drugs, promote the use of high-efficiency, low-toxic biological pesticides. Light Color Halves Walnut Kernels
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