When autumn soybeans grow in autumn, they will fall off without the necessary moisture. In the autumn drought year, the activity of soybean rhizobia weakened, and the fixed nitrogen was far from meeting the needs of the flowering stage.
Topdressing of flower buds and fertilizers is the period when most fertilizers are needed. In order to avoid adverse effects of nitrogen fertilizers on the nodule formation, nitrogen fertilizers are generally not recommended as seed fertilizers, base fertilizers, and seedling fertilizers. Appropriate amount, therefore, the appropriate amount of nitrogen fertilizer after flowering, to promote the late growth and development of soybean, reduce the loss of calyx has a good effect. Flower manure is generally applied at the early flowering stage, with 4-5 kg ​​of urea per mu and 7.5-10 kg of superphosphate. In the soybean root side about 5 cm open hole application, Shi Hou soil cover fertilizer.
The foliar fertilizer is sprayed on the roots 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 the leachate, and sprayed on the leaves, suitable for cloudy days or Spraying after 4 pm will help 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.
Chemically modulating the effects of paclobutrazol on soybean production, increasing branching, shaping ideal plant type, and increasing yield. Soybean sprayed paclobutrazol is generally an indeterminate clam-type cultivar with a greater yield increase than a limited scab-type cultivar. The suitable concentration used is 0.01%-0.02% dilution, and the best spraying period is before and after flowering. Spraying concentration in the infinite scab type and growing good soybeans can be appropriately higher, and limited scab types and growth should generally be lower.
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