The demand of soybean for nitrogen fertilizer
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The key period of soybean nitrogen demand is mainly seedling stage and flowering stage. In the seedling stage, the nitrogen content in the cotyledons is exhausted, and the soybean seedlings may have short-term nitrogen deficiency before the nodule has begun to fix nitrogen. Applying a small amount of nitrogen fertilizer during the sowing period can promote the growth of seedlings, and the disadvantages of nitrogen fixation in the subsequent nodules are small. In the early stage of flowering, the nitrogen requirement of soybean reached its peak. At the same time, the nitrogen content in the soybean begins to flow to the seed. The function of the leaf is seriously weakened due to the decrease of nitrogen in the seed. The nitrogen fixation of the rhizobium begins to weaken. The application of nitrogen fertilizer at the early flowering stage is an effective stimulation measure.
From: Haishu Agricultural Economic Net