Urea nitrogen 46%, is currently the most commonly used production of high-quality nitrogen fertilizer, but the utilization of urea applied to the soil is usually only 45% -50%. So, how to increase the utilization of urea?
Deeply. Whether urea is used as a base fertilizer or as a top dressing, the soil should be deeply applied. The depth of fertilizer should be 10-12 cm. The urea deep application can obviously increase the utilization rate.æ¤ experiment, urea meter or shallow application of 2-3 cm, the utilization rate is only 30%; fertilization depth of 5 cm, the utilization rate of 45%; deep application of 10-20 cm, the utilization rate of up to 65%.
Apply early. Urea belongs to Ammonium Ammonium Nitrogen Fertilizer and can not be directly absorbed and utilized by crops after being applied to soil. It needs to be converted into ammonium nitrogen for the root system to absorb in the soil under the action of urease; late application time is not only unfavorable to the exertion of fertilizer, but also may cause Crops are greedy and late.
Foliar spraying. The urea molecule is small and easily absorbed by the leaves. It is the most suitable fertilizer for foliar spraying. The foliar spray has strong pertinence, fast absorption rate, no influence from soil factors, high nutrient utilization rate, and low fertilization amount. The effect of increasing production is obvious, especially in poor soil environment, excessive water or drought, over-acid or over-alkali soil. When the absorption of roots is impeded by the roots and the crop needs urgently nitrogen nutrition and the vitality of the roots of the crops at the later stage of growth is subsided, the foliar spraying can fill up the deficiency of sucking roots.
Application in conjunction with the rest of the fertilizer. Urea should be combined with organic fertilizers, phosphorus and potash fertilizers and trace element fertilizers to maintain soil nutrient balance, maximize nutrient utilization and play a role in fertilizer production.
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