Take effective measures to prevent the falling of soybeans
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First, due to seedlings to fertilizer. Insufficient soil or base fertilizer, before flowering, potassium sulfate can be applied to 7.5-10 kilograms per acre, and applied to the underground tillage in the ditch; the plants in the flowering stage can not be closed in time due to lack of fertilizer and can be used in the early flowering stage. Once again, topdressing once, usually topdressing 5 kg of urea or 10 kg of ammonium sulfate per acre, can reduce the loss of calyx.
Second, outside the top dressing. In the flowering stage, generally 0.5 kg of urea per mu, 1.5 kg of superphosphate, 0.25 kg of potassium sulfate, 0.02 kg of borax, 50 kg of water, extract leachate, and spray on the leaves, suitable for spraying on cloudy days or after 4 pm , It helps 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. The high-yield plots can be sprayed with 15% paclobutrazol 20g/50kg per acre for the initial flowering period, which can improve the soybean plant type, extend the functional period of the leaves, improve the ventilation and light transmission conditions in the field, and optimize the growth environment of the soybeans, thereby promoting flower development. Cockroach grows and reduces shedding.
Fourth, pay attention to drought relief. From the flowering stage to the sowing period is the period of the fastest water absorption and maximum water consumption during the whole life of a soybean. If the absolute water content of the soil is less than 25%, it should be watered during this period. Usually, water is poured every 5 to 7 days. Continuous irrigation 2 - 3 times, should not flood flooding, soybean is a kind of poor resistance to the crops, flooding is also easy to cause falling flowers and falling, so pay attention to drainage and prevent waterlogging. Fifth, strengthen disease prevention and control. Virus disease can be controlled at the beginning of the disease with 5% Mycotoxin 250 times liquid spray, and purple spot can be treated with 50% mancozeb 800 times after flowering.