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According to the growth and development of soybeans. It mainly grasps fertilizers in two periods, one is the seedling stage and the other is the flowering and podging period.
After the emergence of soybeans, generally when a soya bean bud leaves is unfolded, 3 to 5 kg of urea per acre can be used for top dressing. Green food soybeans are not chased by chemical fertilizers, but chase organic fertilizer. Mushi high-quality fertilizer is 500 kg. If the seedling grows vigorously and there is no shortage of fertilizer, no nitrogen fertilizer or less nitrogen fertilizer may be applied during the seedling period to prevent the plants from becoming long-term.
Flowering and scarring is the critical period for fertilization. It is also the most vigorous period for soybean growth. Application of appropriate amount of nitrogen fertilizer to soybeans 5 to 7 days before flowering or early flowering can promote the formation of carbohydrates and proteins while reducing flowering.èš shed, promote premature, increase production, has a significant effect. Tests have shown that topdressing nitrogen fertilizers at this stage increases production by more than 10% compared to non-recovery nitrogen fertilizers. Generally about 200-250 kilograms of ammonium nitrate is applied per hectare, or about 130-160 kilograms of urea.
In addition, soybeans also need to make up for grain fertilizers, soy enters the pods and grains, the root activity declines, and the ability to soak up fertilizers weakens. We should use extra-root fertilizers, ie foliar sprays, to top-dress and improve soybean maturity. Degree, increase grain weight, improve the quality of soybeans, has a very important role.
Technical points of soybean topdressing
Soybean is a crop with high N requirement. Although its rhizobia have nitrogen fixation, it is far from meeting the need for nutrients in soybean growth period, and it still needs to absorb 60% to 70% of nitrogen nutrition from soil.