When is the best time to apply fertilizer to soybeans?

Soybean topdressing time

Soybean's demand for fertilizers varies greatly at different growth stages. Generally, the demand for nutrients is highest from the flowering stage to the grain filling stage, which is also the best time to apply fertilizer.

Pumpkin topdressing fertilizer

During the fertilization process, soybeans should focus on phosphorus supplementation, and nitrogen and potassium should be appropriately supplemented. When planting soybeans, it is necessary to use base fertilizer well, applying 30-40 kg of phosphorus fertilizer and 50-60 kg of urea per mu; after entering the flowering period, boric acid or borax should also be sprayed to achieve the effect of increasing flowers and fertilizers.

Methods of topdressing for high yield of soybean

Soybean seedling fertilizer: The root nodules of soybean seedlings are in the formation stage and have no nitrogen fixation ability. If the nitrogen nutrition cannot keep up, it will affect the early growth of seedlings. Early topdressing can promote the growth of roots and leaves. Generally speaking, when the compound leaves unfold, the yield per mu can reach 4-6 kg. Applying an appropriate amount of phosphorus fertilizer in the seedling stage is conducive to the formation and development of soybean root nodules. The application amount of superphosphate can reach 8-10 kg.

Soybean flower fertilizer: The flowering and pod stage of soybeans is the peak period for fertilizer absorption. In the early flowering stage, an appropriate amount of nitrogen fertilizer can be applied to reduce the shedding of flowers and pods, and the yield per mu can be increased by 15-20%. Generally, 5-8 kg of urea is applied per mu, and a pit is dug 5-7 cm away from the bean root, and then covered in the ground. If the soil is fertile and the plants grow robustly, the effect of nitrogen topdressing is small. When the amount of phosphorus applied as basal fertilizer is insufficient, 7-10 kg of urea can be applied per mu.

Granulating fertilizer: After soybeans enter the pod-setting and grain-filling stage, the nitrogen-fixing ability of rhizobia and the vitality of the root system gradually decrease, and the ability to absorb fertilizer decreases. At this time, foliar spraying should be used to supplement nutrients to reduce pod drop. Generally, 50 kg of 0.3% potassium dihydrogen phosphate is used per mu, and it should be sprayed evenly on the leaves after 4 pm to the evening. Spray 2-3 times in a row. If denitrification occurs, 0.5 kg of urea can be added per mu for mixed spraying.