First, due to seedlings to fertilizer. If the soil is thin or the base fertilizer is insufficient, before the flowering, potassium sulfate 7.5 kg to 10 kg may be applied per acre, and the ditch may be applied to a subterranean plow layer. In the flowering period, the field where the plants can't be sealed due to lack of fertilizer can be applied again at the early flowering stage. Generally, 5 kg of urea or 10 kg of sulfuric acid is applied per acre, which can reduce the loss of flower buds.

Second, the root spray fertilizer. During the flowering stage, generally 0.5 kg of urea per mu, 1.5 kg of superphosphate, 0.25 kg of potassium sulfate, 25 g of borax, 50 kg of water added to extract leachate, sprayed on the leaves, suitable for spraying on cloudy days or after 4 pm, It is beneficial to preserve flowers, increase grain growth, reduce grain size, and increase grain weight. The root spray fertilizer can be combined with disease prevention and pest control to increase labor efficiency.

Third, chemical regulation. Soybeans use paclobutrazol for strong strains, increasing branching, shaping ideal plant types, and increasing yield. In high-yielding fields, 20 grams of paclobutrazol (15%) per acre can be applied to 50 kilograms of water per acre at the initial flowering stage. Can improve the soybean plant type, extend the functional period of the leaves, improve the ventilation and light conditions in the field, optimize the growth environment of soybeans, thereby promoting growth and reducing shedding.

Fourth, pay attention to drought relief. From the flowering period to the sowing period is the period of the fastest absorption of water in soybeans, the period of maximum water consumption, and in the main producing area of ​​soybean in Huaibei this period coincided with the drought-prone period, resulting in a large number of falling flowers. If the absolute water content of the soil is less than 25% during this period, irrigation should be performed. Generally every 5 days to 7 days irrigation water, continuous irrigation 2 times ~ 3 times, avoid flooding irrigation. Soybean is also a kind of crop with poor waterlogging resistance. After flooding, it is also easy to cause flower failure. Therefore, it is necessary to pay attention to drainage and prevent waterlogging. ?

Fifth, strengthen pest control. Virus disease can be sprayed with 5% bacteriophage 250 times at the beginning of the disease; purple spot can be sprayed with 50% benzene or 800 times solution of zein after flowering; soybean ground pest can use 1.8% of avi 3000 times solution of mycin to control. ?

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