Improper use of chlorinated fertilizers can cause “chlorinating†phenomena such as seed burning and injury, and scientific application of such fertilizers should be “three cautionsâ€.
To prevent chlorine ions from accumulating chlorinated fertilizers in the soil, it is appropriate to use them in rainy seasons or in areas with high precipitation, so as to use rain showers to allow more chloride ions to escape from water and prevent them from accumulating in the soil. To avoid "chlorine harm" in crops. Therefore, it is better not to apply chlorinated fertilizer or to use less chlorinated fertilizer in dry lands without irrigation conditions, saline-alkaline lands with poor drainage, high-temperature and dry seasons, and areas with low water and rainfall.
It is necessary to use organic fertilizer combined with sufficient maturity to apply fertilizer containing chlorinated fertilizer, in conjunction with adequately applied organic fertilizer, to increase the fertilizer efficiency of chlorinated fertilizer and reduce the adverse effects of chloride ion. In the soil with low effective phosphorus content, chloride ions have an inhibitory effect on the absorption of phosphorus by crops, often resulting in the lack of phosphorus in crops. Therefore, it is necessary to pay attention to appropriate amount of phosphate fertilizer when applying chlorinated fertilizers. Complex (mixed) Hefei and formula fertilizers containing chlorinated fertilizer and urea, ammonium phosphate, calcium superphosphate, calcium magnesium phosphate, etc., can not only reduce the harm of chloride ions, but also be used in combination with nitrogen, phosphorus and potassium. It can balance the effects of fertilization.
To master the application of scientific methods containing chlorinated fertilizer can be used as base fertilizer or topdressing, but not as a fertilizer. When basal fertilizer is applied, it should be deepened and covered with soil in advance. Generally, it should be applied 7 days before sowing or transplanting, and it should be applied to the seed or the underside of seedlings, preferably 5 to 7 cm away from the topsoil. When topdressing, it can be applied to water or dilute urine water by means of acupuncture or sticking (avoid application), and it is 5 to 10 cm away from the crop plants. In the crop seedling stage, the amount of chlorinated fertilizer should not be too large. When a large amount of chlorinated fertilizer is needed in the middle and later stages of crop growth, it can be applied 2 to 3 times depending on the crop growth situation, with an interval of 15 to 20 days.
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