Topdressing is a fertilizer applied to supplement the lack of base fertilizer during crop growth. Topdressing is very important for the increase of soybean yield. In order to meet the demand for nutrients in soybean growth and development in a timely manner, topdressing fertilizers are applied with quick-acting fertilizers. Today, Xiaobian will take you to understand the most suitable time for soybean topdressing and the precautions for application.
First, the most suitable period for soybean topdressing
Topdressing generally begins at the flowering stage of soybeans and enters the most vigorous stage of growth. At this time, soybean plant height, leaf area coefficient and dry matter accumulation are relatively fast, and more nutrients are needed. However, at this time, the available nutrients in the soil usually drop to a low value, and the nutrient supply is insufficient. Therefore, the quick-acting nitrogen fertilizer at the early flowering stage of soybean can significantly increase the dry matter accumulation and photosynthetic rate, and is an effective measure for high yield of soybean.
Second, the precautions of soybean topdressing
1. Soybean topdressing nitrogen fertilizer should be flexibly controlled according to the growth of the plant and the soil fertility. If the soil is malnourished, the bean seedlings are thin, and the top dressing time should be appropriate.
2. The plot that has been topdressed during the seedling period, if the flowering period is still lack of fertilizer, it can be supplemented once.
3. If the bean sprouts grow robustly, the leaf area factor is too large, so it is not necessary to trace the nitrogen fertilizer during the initial flowering period of soybeans, so as to avoid causing lengthening and lodging.
4, thin and weak seedlings can be more appropriate for topdressing.
5, topdressing with ditch is good, urea can also be applied to the line, preferably combined with cultivating and irrigation to ensure fertilizer efficiency.
6, the application should avoid spreading the fertilizer on the leaves to prevent burns on the leaves.
In addition to the above top dressing, soybeans have another type of foliar top dressing, which can be applied later. But this is just a way to topdress the roots, not to replace the root dressing of soybeans. Therefore, soybean growers still have to do a good job of topdressing in this period of soybeans in order to play a good role in the growth and yield of soybeans in the later period.
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