Urea is suitable for basal fertilizers and top dressings, and is generally not used as a seed fertilizer. Because the high concentration of urea can destroy the structure of the protein and make the protein deteriorate, affecting the seed germination and the seedling root growth, the seed will lose its ability to germinate when severe. Urea makes chemical fertilizers suitable for high soil temperature environment, otherwise it will reduce the temperature and affect the growth of roots. 1, autumn application Urea application in autumn is better than that in spring. Under the same conditions, according to the test, the utilization rate of urea can be increased by more than 10.8% over the spring season. If organic fertilizer and other fertilizers are used, the effect is better. 2, outside the top dressing Urea makes the amide fertilizer, organic, neutral, without auxiliary components, not easy to cause burns on the leaves; urea molecular volume is small, easy to enter the cells through the cell membrane, urea itself is hygroscopic, easily absorbed by the leaves, urea into the leaves When penetrated, it is not easy to cause plasmolysis, and even if it occurs, it will recover quickly. Therefore, urea as top dressing is better than other nitrogen fertilizers. The concentration and time of spraying outside the root varies with the type of crop. Generally, the use of urea is 0.5-2.5 kg per acre, once every 4-5 days, 2-3 times. 3, deep application The urea is applied to the soil and is first subjected to the action of microorganisms in the soil, and finally it is hydrolyzed to ammonium carbonate or ammonium bicarbonate before it can be absorbed by the crop roots. Ammonium carbonate is very unstable, in the soil or the soil surface decomposition of free ammonia, volatile loss, so urea should also apply deep cover soil, cover soil depth is generally about 10 cm. 4, cloudy or after the rain The urea has good hygroscopicity and the topdressing in the drylands is as much as possible after rain so that the fertilizer dissolves quickly and is absorbed by the soil. And because of the low temperature, it is not easy to volatilize ammonia. At the same time, the leaves can absorb some of the fertilizer through the leaves, increase the fertilizer efficiency, and reduce losses. 5, use in the morning or evening Do not use it in direct sunlight at noon, otherwise it will cause the decomposition of ammonium carbonate or ammonium bicarbonate to produce ammonia gas, causing damage to the leaves and causing damage. 6, with other fertilizers Urea is a unit fertilizer, which should be used in combination with phosphate fertilizer or other fertilizers to meet the needs of crops for various nutrients, but also to play a role in helping between fertilizers. 7, Urea and organic fertilizers are used together The effective measures to increase urea fertilizer efficiency in the application of urea and organic fertilizers can be used to complement each other, improve efficacies, save fertilizers, promote microbial activities, improve crop nutrient conditions, reduce production costs, increase production, increase income, etc., thereby increasing fertilizers. Utilization and economic efficiency.
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