Urea is favored by vegetable growers, but it should be noted when applying urea. It is not watered immediately after use. Because the nitrogen content in urea is ammonium amide, the ammonium amide is converted into ammonium carbonate or ammonium hydrogencarbonate for the absorption and utilization of vegetable roots under the action of urease secreted by soil microorganisms. If the urea is applied immediately after watering or encounters rain, the nitrogen in the ammonium amide state will be lost. Therefore, whether urea is used as vegetable base fertilizer or top dressing, it should be applied for 5~6 days after it is applied, so that it can be completely converted and then watered to avoid loss.
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