Bean is a crop that requires higher nitrogen fertilizer. Although its rhizobia have nitrogen fixation, it is far from meeting the needs of soybean growth period for nutrients, and still needs to absorb 60%-70% of nitrogen nutrition from soil.
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 piece of soybean sprouts is unfolded, 3-5 kilograms of urea can be used for top dressing per acre. Green food soybeans are not chased by chemical fertilizers and 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 podling stage is the critical period of fertilizer requirement, and it is also the most vigorous growth period of soybean. Applying appropriate amount of nitrogen fertilizer before or 5-7 days before flowering of soybean can promote the formation of carbohydrates and protein, and at the same time, reduce 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. Source: Guangdong Agricultural Resources Market Network
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