Technical points of soybean topdressing

Bean is a crop with high nitrogen fertilizer. Although its rhizobium has nitrogen fixation, it can not meet the nutrient requirements of soybean growth period, and it still needs to absorb 60%-70% of nitrogen nutrition from soil.
According to the law of soybean growth and development. Mainly master the topdressing of two periods, one is the seedling period, and the other is the flowering and pod-forming period.
After the emergence of soybeans, generally, when a compound leaf of soybean buds is unfolded, 3-5 kg ​​of urea can be used for topdressing per acre, green food soybeans, no fertilizer, but organic fertilizer, and 500 kg of high-quality agricultural fertilizer. If the seedling grows strong and there is no shortage of fertilizer, the seedling stage may not be applied with nitrogen fertilizer or less nitrogen fertilizer, so as to avoid plant growth.
Flowering and pod-forming period is the critical period of fertilizer requirement, and it is also the most vigorous period of soybean growth and development. Applying proper amount of nitrogen fertilizer 5-7 days before flowering or early flowering can promote the formation of carbohydrates and proteins, and also reduce flowers. The pods fall off, promote early maturity, increase yield, and have obvious effects. Tests show that in this period, the application of nitrogen fertilizer increased by more than 10% compared with the general mu without nitrogen fertilizer. Generally, about 200-250 kg of ammonium nitrate is applied per hectare, or about 130-160 kg of urea, combined with cultivating and cultivating soil for top dressing.
In addition, soybeans should supplement the grain fertilizer, soy enters the pod-forming period, the root activity declines, and the ability to absorb fertilizer is weakened. The root dressing should be used, that is, the method of foliar spraying to carry out topdressing and improve soybean maturity. Degree, increase 100-grain weight, improve soybean quality, has a very important role.

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