Problems in the application of urea
First, it is not suitable for seed fertilizer. When urea is used as a seed fertilizer, high concentrations of urea can destroy the protein structure of the seed and also have toxic and inhibitory effects on the seed. If it is necessary to apply as a seed fertilizer, avoid contact with the fertilizer and control the dosage.
Second, it should not be mixed with alkaline fertilizer or applied at the same time. Alkaline fertilizers such as grass ash, lime, calcium magnesium phosphate, and urea are mixed or applied simultaneously, which promotes the nitrogen in the urea to become ammonia and volatilize. Therefore, in summer and autumn, urea and alkaline fertilizer should be staggered for 4 to 5 days, and winter and spring should be staggered for 7 to 8 days.
Third, it is not suitable for single application. Urea should be combined with organic fertilizer and phosphorus and potassium fertilizer to meet the needs of various nutrients of crops and improve the utilization rate of urea.
Fourth, it is not advisable to water immediately after application. The nitrogen in urea is an amide nitrogen, which is highly fluid and leached in the soil. Therefore, after applying urea, do not water it before it is converted, otherwise it will be wasted. Generally, summer and autumn seasons should be watered 2 to 3 days after application, and winter and spring seasons should be watered after 7 to 8 days.
5. It is not advisable to spray high-concentration foliage. Foliar spray should avoid excessive concentration of urea solution, otherwise it will burn out the leaves and poison the plants. Generally, the concentration of corn, wheat, rice, and cotton is preferably 2%; vegetables and fruits are preferably 0.5% to 1%.
Six, should not be shallow. Urea shallow nutrient is volatile and easily absorbed by weeds. The deep application of urea is beneficial to the exertion of fertilizer efficiency. When applying top dressing, apply a hole to the seedling or ditch on the side of the seedling, and the depth should be 10 to 15 cm.
Seven, should not be used too much, applied too late. The nitrogen content of urea is 44% to 48%, the nutrient content is high, and the application amount should not be too large to avoid waste. Urea is applied too late, which is easy to cause crops to be late and ripe. The average crop field is applied in an amount of 5 to 15 kg per mu, which is 4 to 7 days earlier than other nitrogen fertilizers.
Source: Hebei Science and Technology News
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