How to use chlorinated fertilizer safely

Chlorinated fertilizer refers to a class of chemical fertilizers containing chloride ions, such as ammonium chloride and potassium chloride, as well as complex (mixed) fertilizers, special fertilizers, formula fertilizers, etc. prepared by using ammonium chloride and potassium chloride as raw materials. . Since the salt index of the chlorinated fertilizer is high, and the chloride ion is difficult to be adsorbed by the soil, the concentration of chloride ions in the soil is increased at the initial stage of application, which is liable to cause "chlorine damage". If improper application of chlorinated fertilizer can cause burning, injury and other phenomena, the following aspects should be noted in the specific application process:

Chloride-containing fertilizer should be applied preferentially to crops with high chloride tolerance or medium chlorine tolerance, such as rice, wheat, rapeseed, and tomato; for crops with weak chlorine tolerance, such as tobacco, tea, citrus, and grapes, Strictly control the dosage. There is a difference in the resistance to chlorine between different varieties of the same crop. For example, among rice varieties, the hybrid rice has the strongest chlorine tolerance, and the conventional early rice has the weakest chlorine tolerance.

In the rainy season or in areas with high precipitation, the application of chlorinated fertilizer, chloride ions leaching with water, can avoid "chlorine damage" to crops. It is best not to use or less chlorinated fertilizer in dry land without irrigation, salt-alkali land with poor drainage, high temperature and dry season, and water and rain.

When applying the chlorinated male compound, the application of the decomposed organic fertilizer can improve the fertilizer effect of the chlorinated fertilizer and reduce the adverse effects of the chloride ion. Formulating complex (mixed) fertilizer and formula fertilizer with chlorinated fertilizer and urea, ammonium phosphate, superphosphate, calcium magnesium phosphate, etc., can not only reduce the harm of chloride ion, but also can be used together with nitrogen, phosphorus and potassium. Balanced fertilization and complement each other.

Containing chlorinated fertilizer can be used as base fertilizer, but also as top dressing, but it is not suitable for seed fertilizer. When making the base fertilizer, it should be applied early and covered with soil. Generally, it should be applied at least one week before sowing or transplanting. Apply it to the underside of the seed or seedling. It should be 5 cm-7 cm away from the topsoil. Or the application, and from the crop plants 5 cm -10 cm, should not be applied. When the application amount is large, it can be applied in 2 or 3 times, and the chlorine sensitive period of the crop should be avoided. The chlorine sensitive period of crops is mostly in the seedling stage.

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