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What are the methods for preventing and controlling soybean flower and pod drop?

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1. Reasonable topdressing. Usually, soybean is topdressed once with nitrogen fertilizer at the early flowering stage, which can reduce the rate of flower and pod drop, extend the lifespan of the plants, increase grain weight, and raise yield. Generally, 150-230 kg of ammonium nitrate or 120-180 kg of urea can be applied per hectare; at the flowering and podding stage, foliar topdressing can be carried out, using 0.5 kg of urea, 1.5 kg of superphosphate, 0.3 kg of potassium sulfate, and 30 g of borax per mu, adding 50 kg of water, extracting the leachate, and spraying it on the leaf surface, which helps preserve flowers, increase pods and grains, and raise the 100-

1. Reasonable topdressing. Usually, soybean is topdressed once with nitrogen fertilizer at the early flowering stage, which can reduce the rate of flower and pod drop, extend the lifespan of the plants, increase grain weight, and raise yield. Generally, 150-230 kg of ammonium nitrate or 120-180 kg of urea can be applied per hectare; at the flowering and podding stage, foliar topdressing can be carried out, using 0.5 kg of urea, 1.5 kg of superphosphate, 0.3 kg of potassium sulfate, and 30 g of borax per mu, adding 50 kg of water, extracting the leachate, and spraying it on the leaf surface, which helps preserve flowers, increase pods and grains, and raise the 100-grain weight.

2. Chemical control treatment. For plots where soybean grows too luxuriantly, chemical control treatment can be carried out to prevent excessive vegetative growth, improve field ventilation and light transmission conditions, optimize the soybean growth environment, promote good soybean growth, and reduce flower and pod drop.

3. Drought resistance and waterlogging prevention. "When soybeans bloom, you can catch shrimp in the furrows." The period from flowering to podding is the time when soybean absorbs the most water and the fastest in its entire life. Drought during this period easily causes flower and pod drop, so reasonable irrigation should be carried out to prevent drought. Irrigation should be thorough at one time, and irrigation should be done whenever drought appears. Never use flood irrigation. Soybean is also afraid of waterlogging, and flooding can easily cause flower and pod drop, so waterlogging prevention work should also be done well at the same time.

4. Disease prevention and pest control. Because the area of continuous and alternating cropping is relatively large, the area affected by soybean diseases and insect pests is also relatively large and severe. Therefore, we must adhere to prevention first, combine prevention and control, and carry out integrated management to reduce flower and pod drop.

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