There are two critical periods for applying nitrogen to soybeans: The critical period for the first nitrogen requirement is the “seedling periodâ€, and the demand is small, but it is critical. Applying a small amount of nitrogen fertilizer at the time of sowing can promote seedling growth. Especially in plots with special nitrogen deficiency, early application of nitrogen fertilizer can promote seedling growth and root development. Carbohydrates in the shoots are transported to the roots, which can induce nodules nitrogen fixation. In the seedling stage, diammonium phosphate is used as a seed fertilizer, or compound fertilizer strips containing low-nitrogen phosphorus and potassium are applied. It is advisable to apply a depth of 2 to 3 inches below the seed. The preferred varieties of soybean nitrogen fertilizer include ammonium nitrate, ammonium sulfate and potassium nitrate. The “first flower†to “pod fruit period†are the second critical period for soybeans to have a large amount of nitrogen. The lack of nitrogen affects both the yield and the quality and reduces the content of amino acids. You can top up a small amount of urea.
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