Pure potassium chloride is a white, pale yellow, brick red crystal. The content of active ingredient (K2O) is usually about 60%. This kind of fertilizer has strong hygroscopicity and is easily soluble in water. The solubility in water increases with the increase of temperature.
Potassium chloride is most suitable for potassium-deficient soil and rice, wheat, cotton, corn, sorghum and other field crops; it is also more suitable for application on neutral calcareous potassium-deficient soils.
The use of potassium chloride has the following main methods:
(1) It is not suitable to apply chlorine-sensitive crops such as tobacco, sugar beet, sugar cane, potato, grape, etc.
(2) can be used as basal fertilizer, topdressing, but not for fertilizer. Because potassium chloride fertilizer contains a large amount of chloride ions, it will affect the seed germination and seedling growth. When used as a basal fertilizer, potassium chloride is usually applied to the soil in combination with cultivated land 10-15 days before sowing. The main reason for doing this is to wash away chloride ions from the soil. When potassium chloride is used as topdressing, it is generally required that the seedlings be applied after the seedling grows.
(3) dosage problem. Master the application amount of potash fertilizer with the most economic benefits. Generally, the application rate per mu is controlled between 7.5 and 10 kg. For the sand soil with poor fertility and relatively low water retention capacity, the principle of small amount of multiple application shall be followed.
(4) If potassium chloride is used as a basal fertilizer or as a top dressing, it should be applied early to facilitate the leaching of chloride ions to the lower layers of the soil through rainwater or irrigation water to remove or reduce the harm of chloride ions to crops.
Things to be aware of when using potassium chloride fertilizers:
(1) Potassium chloride combined with nitrogen fertilizer and phosphate fertilizer can better exert its fertilizer effect.
(2) Potassium chloride should not be applied to saline-alkali land with poor water permeability, otherwise it will increase the salt damage to the soil.
(3) When potassium chloride is applied to sandy soil, organic fertilizer should be used in combination.
(4) Acidic soils are generally not suitable for applying potassium chloride. For application, lime and organic fertilizers may be used in combination.
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