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Urea contains 46% nitrogen, which is the most commonly used high-quality nitrogen fertilizer in production. However, the utilization rate of urea after being applied to the soil is usually only about 30%. So how do you improve the utilization of urea?
1. Deep application. Whether urea is used as a base fertilizer or as a top dressing, deep application of soil should be applied, and the depth of fertilization is 10-12 cm. The deep application of urea can significantly improve the utilization rate. According to the test, the urea is applied or applied 2-3 cm in shallow application, the utilization rate is only 30%; the application depth is 5 cm, the utilization rate is 45%; the deep application is 10-20 cm, and the utilization rate is up to 65%.
2. Early application. Urea is an amide nitrogen fertilizer. It can not be directly absorbed and utilized by crops after being applied to the soil. It needs to be converted into ammonium nitrogen in the soil to be absorbed by the roots. Therefore, the application time is too late, which is not only harmful to the effect of fertilizer, but may also cause The crops are late and ripe.
3. Spray. The urea molecule is small in volume and easily absorbed by the leaves, and is the most suitable fertilizer for foliar application. Foliar spray is highly targeted, fast in absorption, free from soil environmental factors, high in nutrient utilization, and low in fertilization, and significant in yield increase, especially in poor soil environment, excessive water or drought, and soil over-acid or When alkali causes the absorption of roots to be impeded and the crops need nitrogen nutrients urgently and the root activity declines in the late stage of crop growth, foliar application can make up for the deficiency of root fertilizer.
4. Mixed use. Urea combined with organic fertilizer, phosphorus and potassium fertilizer and trace element fertilizer can maintain soil nutrient balance, maximize nutrient utilization and increase fertilizer production. Urea and organic fertilizer combined application is an effective measure to improve urea fertilizer efficiency. It can take advantage of long-term supplement and quick recovery; improve fertilizer efficiency, save fertilizer; promote microbial activities, improve crop nutrient conditions; reduce production cost, increase yield, increase income, etc. Economic benefits.
5. Do not mix with alkaline fertilizer. Urea is a neutral fertilizer. When topdressing, it should not be mixed with alkaline fertilizer to prevent reducing fertilizer efficiency.
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