Because nitrogen release from long-term nitrogen fertilizers is relatively slow and the peak release period is about 5 days later than urea, it should be earlier than the conventional application period of urea. Generally 5-6 days in advance in early spring and 3-4 days in summer. Long-acting nitrogen fertilizers have stronger nitrogen retention capacity in soil and higher utilization rates. Therefore, its use is slightly less than that of normal nitrogen fertilizers. It is usually 10-15% less than the constant. Due to different soil qualities, the long-acting nitrogen fertilizers also have significant differences in their ability to absorb and retain soil. The absorption and preservation ability of clay is strong, and the amount of clay can be more; the amount of sandy soil should be used in small amounts and multiple times. To apply long-acting nitrogen fertilizer scientifically according to different nitrogen uptake characteristics of crops.
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