Four tricks of applying urea

Urea is the most commonly used high-quality nitrogen fertilizer in production at present, but its utilization rate is usually only 45% to 50% after it is applied to the soil. Mastering the following four tips can improve the utilization rate of urea.

1. Deep application of urea, whether used as base fertilizer or topdressing fertilizer, should be applied deeply to cover the soil, and the suitable depth is 10-12 cm. According to the experiment, urea surface application or shallow application 2cm, the utilization rate is only 30%; the depth of application is 5 cm, the utilization rate is 45%; deep application of 10 cm 20 cm, the utilization rate can reach 65%.

two。 Early application of urea belongs to acyl ammonium nitrogen fertilizer, which can not be directly absorbed by crops after being applied to soil. It needs to be transformed into ammonium nitrogen under the action of urease in soil in order to be absorbed by crop roots. Therefore, its application time is too late, not only is not conducive to fertilizer efficiency, but also may cause crops greedy green late ripening.

3. Spraying urea is the most suitable chemical fertilizer for foliar spraying because of its small molecular size and easy to be absorbed by leaves. Foliar spraying has the advantages of strong pertinence, fast absorption rate, not affected by soil environmental factors, high nutrient use efficiency, less fertilizer application, and significant yield increasing effect. especially when the root absorption is blocked due to poor soil environment, excessive water or drought, soil excessive acid or alkali, crops in urgent need of nitrogen nutrition and the decline of root activity in the later stage of crop growth, foliar spraying can make up for the deficiency of root fertilizer absorption.

4. The combined application of urea with organic fertilizer, phosphorus and potassium fertilizer and trace element fertilizer can maintain the balance of soil nutrients, maximize the utilization rate of nutrients and give full play to the role of fertilizer in increasing production. Huang Qingsong