If the soil is topped off by the seedlings, if the soil is poor or the base fertilizer is insufficient, before the flowering, potassium sulfate can be applied at a rate of 7.5-10 kilograms per acre, and the ditch can 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. Usually 5 kg of urea or 10 kg of ammonium sulfate per acre can reduce the loss of calyx.
Fertilizer outside the root usually spray 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, spray on the leaves, suitable for cloudy or 4 pm After spraying, it will help preserve flowers, increase grain growth, reduce grain size, and increase grain weight. Root-spraying fertilizers can be linked to disease prevention and pest control to increase labor efficiency.
Chemically regulating soy use paclobutrazol has strong strains, growth branches, shaping the ideal plant type, and increase production. 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 leaves, improve the conditions of ventilation and light in the field, optimize the growth environment of soybeans, so as to promote growth and reduce shedding.
Pay attention to the drought-restraint discharge from the flowering stage to the pod-bearing stage is the fastest time of water absorption in soybeans and the period of maximum water consumption, and in the main soybean producing area in Huaibei this period happens to coincide with the dry season, resulting in a large number of falling flowers. In this period, if the absolute water content of the soil is less than 25%, it should be filled with water. Usually every 5-7 days of irrigation water, irrigation 2-3 times, should not flood irrigation. Soybean is also a kind of crop with poor waterlogging resistance. After flooding, it is easy to cause flowers to fall and fall. Therefore, we must pay attention to drainage and avoid waterlogging.
Strengthen the pest control virus disease in the early stage of the disease can be sprayed with 5% of the bacteria poison clear 250 times solution; purple spot can be sprayed after flowering 50% of Benzol or 800 times solution of dexamethasone; soybean ground pests can take 1.8% The abamectin 3000 times solution was used for prevention and treatment.
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