1. Deep application of urea, whether as a base fertilizer or as a top dressing, should be applied with a deep cover. It is advisable to apply a depth of 10 to 12 cm. According to the test, urea meter or shallow application of 2 to 3 cm, the utilization rate is only 30%; application depth of 5 cm, the utilization rate of 45%; deep application of 10 to 20 cm, the utilization rate of up to 65%.
2. Early application of urea belongs to Ammonium Ammonium Nitrogen Fertilizer, which can not be directly absorbed and utilized by the crop after being applied to the soil. It needs to be converted into ammonium nitrogen under the action of urease in the soil before it can be absorbed by the crop roots. Therefore, the application time is too late, which is not only unfavorable to the exertion of fertilizer effect, but also may cause the crop to become greedy and late.
3. Spraying urea has a small volume and is easily absorbed by the leaves. It is the best fertilizer for foliar spraying. Foliage spraying is highly targeted, fast in absorption rate, free from influence of soil environment factors, high nutrient utilization rate, low fertilization, and significant yield increase effect, especially in poor soil environment, excessive water or drought, soil acidity or over When alkali causes the absorption of roots to be impeded and crops urgently need nitrogen nutrients and the root activity of crops declines during the later period of growth, the foliar spraying can make up for the lack of root absorption.
4. The combined use of urea and organic fertilizers, phosphorus and potash fertilizers and trace element fertilizers can maintain the balance of soil nutrients, maximize nutrient utilization and play a role in fertilizer production.
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