Long-term nitrogen fertilizers generally refer to coated urea and long-acting ammonium bicarbonate with high nitrogen content. Currently, coated urea is commonly used. It is coated with urease inhibitors, which can reduce the volatilization and decomposition of ammonium nitrogen, increase the utilization rate of 10%, and have a long fertilization period, generally about 90 days.
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Long - term Nitrogen Fertilizer Application Techniques for Summer Maize . The fertilizing amount of mu is 25 kg of corn-specific fertilizer, 30 kg of coated urea, or 5 to 10 kg of diammonium phosphate, 30 kg of coated urea, and 10 kg of potassium chloride.
Fertilizer and seed are sown on the same machine during application, fertilizer is on the side of the seed, and the distance between seed and fertilizer is 5-6 cm. It is also possible to have the seed on the same vertical line as the fertilizer and the fertilizer on the lower side of the seed, spaced 8 to 10 cm apart. Or use a fertiliser machine to apply the fertilizer first, then insert the seeds with a seeder, and the seed and fertilizer are placed in a parallel distance of 5-6 cm.
The above methods are all applied at the end of one time and no fertilizer is added in the middle period. After sowing, herbicides are used to control weeds. One-time application of summer maize long-term fertilizer can increase production by 10% to 17%, and increase the benefit by 18% to 25%.
Winter Long - term Nitrogen Fertilizer Application Techniques for Winter Wheat . The amount of fertilized fertilizer was 15 kg of diammonium phosphate, 30 kg of coated urea, and 10 kg of potassium chloride. Or 25 kg of special fertilizer, coating 30 kg of urea.
Application of phosphorus and potash fertilizer or special fertilizer all at the end of the application, coating 50% of urea at the end of application, 50% at the jointing period. Wheat coated urea can increase production by 10% to 15% and increase the benefit by 15% to 20%.
Flower growth nitrogen fertilizer application technology. The amount of fertilizer used for the mu was 20 kg of diammonium phosphate, 15 kg of coated urea, and 10 kg of potassium sulfate.
Before applying ploughing, 50% of nitrogen and phosphate fertilizers were applied, and 50% of nitrogen and phosphate fertilizers and all potassium sulfate fertilizers were applied before ridging and filming. Fertilizers were not chased for fertilization in the whole growth period, and groundnuts were applied in this way. Coating urea can reduce the number of labor, reduce input costs and increase efficiency. At the same time, the coated urea fertilizer has a long period of validity. It can meet the demand of nitrogen for crops in a timely manner and increase the leaf area, which is conducive to photosynthesis and constitutes a yield increase of crops. The conditions for efficiency increase are new types of fertilizers that are worth promoting. (Wu Jing)
