Each crop has its own growth characteristics, and the demand for fertilizer is also different. The nutrients needed for soybean growth come from rhizosphere bacteria in the soil. The main reason why rhizosphere bacteria can support soybean is that rhizosphere bacteria can fix nitrogen in the air. Therefore, this fixed nitrogen is used to absorb nutrients from soybeans. Soybean bloomed in North Asia, becoming the highest peak of nitrogen fixation, and its nitrogen fixation capacity decreased before flowering. Soybean needs more fertilizer than wheat and rice, and rhizobia can only fix nitrogen, but the nitrogen fixed by rhizobia can not fully meet the needs of soybean growth, so a certain amount of nitrogen, potassium and phosphorus need to be added during soybean growth. Only by applying sufficient fertilizer can we ensure sufficient nutrients in the process of soybean growth, make soybean grow normally and realize high yield of soybean. Of course, the more fertilizer, the better. Only the right amount of fertilizer can help the growth of soybeans.
There are many fertilization techniques for soybeans, but most of them are divided into two aspects. First, apply more organic fertilizer. The base fertilizer of soybean is generally organic fertilizer, and many farmers add a lot of organic fertilizer as the base fertilizer for planting soybean. The main reason for choosing organic fertilizer as base fertilizer is that organic fertilizer plays an important role in the growth and development of soybean and also promotes the growth of rhizobia. Rhizobia must be propagated step by step to improve the nitrogen fixation ability of soybean. After harvesting wheat, many farmers have no time to apply base fertilizer because of the tight sowing time.
In this case, more organic fertilizer should be added to the whole wheat field to enhance the organic fertilizer in the field. Only when the fertility of the previous crop is good can the growth of soybean be guaranteed in the later period. The second is to apply nitrogen fertilizer skillfully. Soybean itself has rhizobia, which can fix nitrogen, so it doesn't need much nitrogen during its growth. Therefore, when applying nitrogen fertilizer, the clever application of nitrogen fertilizer is emphasized. The nitrogen fixation ability of soybean is weak before flowering, and nitrogen application can supplement nitrogen and help soybean increase production. Fertilization can be applied before cultivation and then after cultivation. Of course, fertile land does not need this fertilizer.
Soybean needs a lot of phosphate fertilizer, so we should pay attention to the application of phosphate fertilizer during soybean growth. The mobility of phosphate fertilizer in soil is weak, so phosphate fertilizer should be used as base fertilizer. If the phosphorus in the soil is insufficient, it should be applied as soon as possible. If the soil is not short of phosphorus, there is no need to add phosphate fertilizer after soybean planting. In addition, it is necessary to supplement the extra-root expenses. With the growth of soybean and its entry into North Asia, the demand for nutrients has become more powerful and diversified. An obvious physiological feature of soybean after the grain filling stage is the decrease of absorption capacity, which may lead to premature aging due to insufficient fertilizer, and may eventually become the reason for soybean yield reduction. In addition, leaves are an important part of soybean, which is beneficial for soybean to absorb nutrients. Therefore, in the process of soybean planting, foliar spraying can be used, and at the same time, combined with the cost of killing outside the roots, a proper amount of plant growth agent needed by fertilizer solution can be added to improve soybean yield.