What are the precautions for summer agricultural fertilization? Mixing superphosphate with superphosphate containing 3.5%-5% of free acid, seed dressing will reduce seed germination rate and emergence rate. The use of superphosphate for topdressing should be deep trenching; for seed fertilizer, it should be applied to the bottom or side of the seed 8-10 cm to achieve seed isolation.
Urea and ammonium bicarbonate on the surface have high nitrogen content, but they are converted into ammonium nitrogen after being applied to the soil to be absorbed and utilized by crops. Urea is used as a top dressing, and the ditch should be applied to cover the soil. For foliar fertilizer application, the application concentration should be well controlled, and rice, cotton and corn should be sprayed at a concentration of 0.8-1%, and vegetables should be 0.3-0.5%. Ammonium bicarbonate is applied on the surface, which is easy to volatilize, and the volatile ammonia will smother the stems and leaves of the crop and cause fat damage. The correct method should be applied about 10 cm deep, and the soil should be covered immediately after application.
Potassium sulphate and potassium chloride in a single application of potassium fertilizer have a weak physiological acid reaction. After being applied to the soil, potassium ions are easily absorbed and fixed by other ions of the soil colloid, and the crop is difficult to use. Therefore, the application of potassium fertilizer should be mixed with nitrogen fertilizer and phosphate fertilizer, especially in the mountainous areas, infertile land and newly-opened wasteland, and should be mixed with phosphate fertilizer to fully exert the effects of potassium fertilizer and phosphate fertilizer.
The application of calcium, magnesium and phosphorus fertilizers, calcium, magnesium and phosphorus fertilizers is slow, and the fertilizer is short-lived. It is used as top dressing, especially in the late growth stage of crops, which has low utilization rate and poor effect. Therefore, calcium magnesium phosphate fertilizer should be used as base fertilizer and mixed with organic fertilizer, or applied as seed fertilizer. This fertilizer has a long effect and is beneficial to the steady growth of crops without premature aging.
There is a serious "antagonistic" effect between zinc fertilizer and phosphate fertilizer on the application of zinc sulphate and superphosphate. The combination of the two will inhibit the effect of zinc sulphate and reduce its effectiveness. Therefore, the phosphate fertilizer should be used as the base fertilizer, the zinc fertilizer should be used as the base fertilizer in the seedling stage, or the zinc fertilizer should be used as the base fertilizer, and the phosphate fertilizer can be used as the top dressing in the seedling stage to increase the fertilizer efficiency.
Applying chlorinated fertilizer to the chlorine-repellent crops such as sugarcane, tobacco, watermelon, citrus, etc. If chlorine chloride is added to ammonium chloride, potassium chloride, etc., the sugar content of sugarcane and watermelon is reduced due to the action of chloride ions; Combustion performance; citrus chronic poisoning, long-term gray and dull leaves.
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