First, what is long-acting urea China's urea fertilizer utilization rate is generally about 35%, the field fertilizer efficiency period is only 40-60 days. Scholars at home and abroad have tried to improve the urea utilization rate and extend the fertilizer efficiency period in various ways to facilitate agricultural production. There are two main aspects of these approaches: one is to solve the problem from tillage measures and fertilization techniques, such as deep fertilization, timely topdressing, formula fertilization, etc. On the other hand, starting from urea fertilizer, urea is made into long-term, sustained-release and high-utilization. A new variety of fertilizers - long-acting urea.
At present, long-acting urea developed, produced and applied at home and abroad is mainly made by adding a certain proportion of inhibitors to the common urea production process. The inhibitors mainly include urease inhibitors and nitrification inhibitors. Urease inhibitors can inhibit the ammoniation of urea, while nitrification inhibitors inhibit the nitrosation and nitrification of ammonia. There are many varieties of these two types of inhibitors, but the urease inhibitors currently used are mainly hydroquinone (hydroquinone), and the nitrification inhibitor is mainly dicyandiamide (dicyandiamide).
Long-acting urea is a mixture of urea and inhibitor. Due to the small amount of inhibitor added and almost no reaction with urea, the physicochemical properties of long-acting urea are basically the same as ordinary urea, but some varieties are brown or brown in appearance. Brown, other similarities such as specific gravity, melting point, solubility, etc., its particle size, water content, biuret content and so on are basically the same as urea, the nitrogen content is still 46%.
Second, the long-acting urea application results Years of production tests show that long-acting urea fertilizer efficiency can be more than doubled, reaching 110-130 days; nitrogen utilization can be increased by 10 percentage points, reaching 45%. Compared with the same amount of ordinary urea, the crop can increase production by 6-20%, and can save the labor of topdressing. After deducting the increase in the price of long-acting urea, the net income per mu can be increased by 40-100 yuan. In addition, long-acting urea can save 20% of urea under the same production conditions, thereby reducing transportation costs and reducing nitrogen pollution in farmland and groundwater. Therefore, long-acting urea not only has great economic benefits, but also has good social and ecological benefits.
Third, long-acting urea application technology Because long-acting urea fertilizer has a long period of effect and high utilization rate, it is different in application technology from ordinary urea. The specific application effects and application techniques vary from crop to crop, and are combined with different farming systems and soil conditions to simplify operations and save costs. For general crops, such as wheat, rice, corn, cotton, soybeans, and rapeseed, they can be applied one time before sowing (transplanting). In addition to the application before the spring sowing in the north, long-acting urea can be applied to the farmland during the autumn turn. If you need to topdress, you must do it in advance to avoid crops getting late. The long-acting urea is applied at a depth of 10-15 cm, applied to the seeds obliquely below or between the two seeds or mixed with the soil to prevent burning of the seedlings and prevent loss of fertilizer.
In addition, long-acting urea should be used preferentially in the methods of no-cultivation, rice-fishing, and mulching.
At present, long-acting urea developed, produced and applied at home and abroad is mainly made by adding a certain proportion of inhibitors to the common urea production process. The inhibitors mainly include urease inhibitors and nitrification inhibitors. Urease inhibitors can inhibit the ammoniation of urea, while nitrification inhibitors inhibit the nitrosation and nitrification of ammonia. There are many varieties of these two types of inhibitors, but the urease inhibitors currently used are mainly hydroquinone (hydroquinone), and the nitrification inhibitor is mainly dicyandiamide (dicyandiamide).
Long-acting urea is a mixture of urea and inhibitor. Due to the small amount of inhibitor added and almost no reaction with urea, the physicochemical properties of long-acting urea are basically the same as ordinary urea, but some varieties are brown or brown in appearance. Brown, other similarities such as specific gravity, melting point, solubility, etc., its particle size, water content, biuret content and so on are basically the same as urea, the nitrogen content is still 46%.
Second, the long-acting urea application results Years of production tests show that long-acting urea fertilizer efficiency can be more than doubled, reaching 110-130 days; nitrogen utilization can be increased by 10 percentage points, reaching 45%. Compared with the same amount of ordinary urea, the crop can increase production by 6-20%, and can save the labor of topdressing. After deducting the increase in the price of long-acting urea, the net income per mu can be increased by 40-100 yuan. In addition, long-acting urea can save 20% of urea under the same production conditions, thereby reducing transportation costs and reducing nitrogen pollution in farmland and groundwater. Therefore, long-acting urea not only has great economic benefits, but also has good social and ecological benefits.
Third, long-acting urea application technology Because long-acting urea fertilizer has a long period of effect and high utilization rate, it is different in application technology from ordinary urea. The specific application effects and application techniques vary from crop to crop, and are combined with different farming systems and soil conditions to simplify operations and save costs. For general crops, such as wheat, rice, corn, cotton, soybeans, and rapeseed, they can be applied one time before sowing (transplanting). In addition to the application before the spring sowing in the north, long-acting urea can be applied to the farmland during the autumn turn. If you need to topdress, you must do it in advance to avoid crops getting late. The long-acting urea is applied at a depth of 10-15 cm, applied to the seeds obliquely below or between the two seeds or mixed with the soil to prevent burning of the seedlings and prevent loss of fertilizer.
In addition, long-acting urea should be used preferentially in the methods of no-cultivation, rice-fishing, and mulching.
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