Fertilizer demand characteristics of high yield soybean
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Soybeans can be divided into pre-birth, mid-term and late life. The early period refers to the period from the emergence to the early flowering period; the middle period refers to the early flowering to the final flowering period; the latter refers to the final flowering to the mature period. In the early stages of soybean nutrient allocation, roots, growing points, and root nodules. In other words, photosynthetic products accumulating mainly in the aerial parts of plants, especially the leaves, mainly transported to roots, growing points, and root nodules. This can quickly root, increase, increase nodules, is conducive to strong seedlings. After flowering, the nutrient distribution center shifts from vegetative growth to reproductive growth, except that some nutrients are transported to the roots, stems, and leaves. Most of the nutrients are transported to flowers and pods, and later in the fertility stage, the nutrients are transported. Go to the pods. From the perspective of soybean nutrient distribution rules, high-yield soybeans should have the following characteristics of fertilizer requirements. 1. Soybeans both absorb nitrogen from soil and use rhizobia to fix nitrogen. According to this feature, production should not only ensure sufficient absorption of nutrients by the root system, but also create conditions for the development of root nodules and adequate nitrogen fixation, which is an important basis for increasing nutrient utilization and increasing soybean production. 2. The regularity of nitrogen absorption and utilization of high-yield soybean was less in the early stage, more in the medium stage, and less in the later stage. The applied nitrogen fertilizer should adhere to deep application (usually 15-20 cm) if it is applied once sowing, if the topdressing farm is carried out in the early flowering stage. Phosphorus absorption and utilization of the law is the first flowering needs less, flowering and scarring more than needed, and fewer grains and drums mature phase. Accordingly, the phosphate fertilizer must adhere to the deep application of base fertilizer. 3. High-yield soybeans absorb phosphorus more heavily than nitrogen. Although the amount of phosphorus absorbed by soybeans is not large, it is indispensable. The lack of phosphorus will have a greater impact on production. Because in the process of soybean growth and development, nodule development requires phosphorus, flowering period is a sensitive period of phosphorus, stalk solid and indispensable phosphorus, root and strong seedlings, adjust the ratio of nitrogen and phosphorus is conducive to nutrient absorption also need phosphorus. 4. Soybeans readily absorb phosphorus from farmyard fertilizers into the body. Therefore, the application of farmyard fertilizers to ensure the supply of phosphorus nutrition to meet the soybean has a positive effect on the demand for phosphorus nutrition.