Potassium sulfate appears as white crystals or colored crystals or granules. It is characterized by low moisture absorption, it is not easy to agglomerate when stored, and it is easily soluble in water. Applicable to all kinds of crops, can be used as base fertilizer, top dressing, seed fertilizer and extra-root fertilizer, base fertilizer generally 10-12.5 kg per mu, seed fertilizer amount of 1.5-2.5 kg, 0.5% foliar spraying fertilizer is suitable for 2%. Potassium can generally be absorbed by the soil and will not be lost. However, it is also necessary to adopt a “small amount of meal†measure on sandy soils with poor fertility retention. Generally, potassium is applied best to potatoes, melons, and other high-potassium crops. Wide range of use, large amount.
Potassium chloride has a white or light crystalline appearance and sometimes contains iron salts in red. Soluble in water, is a high concentration of available potassium fertilizer. Can be used as basal fertilizer and top dressing. The amount of basal fertilizer is 8-10 kg, and the amount of fertilizer is 5-7.5 kg. The scope of application is correspondingly smaller than that of potassium sulfate. Special attention should be paid to the use of chlorine-sensitive crops such as grapes, potatoes, and tobacco to prevent “chlorine pollutionâ€. In addition, potassium chloride is not suitable for use in saline-alkaline soils, but chloride ions in chlorides promote photosynthesis and fiber formation, and are particularly suitable for the application of fiber crops such as hemp.
To correctly distinguish and use these two kinds of fertilizers, one should pay attention to whether the appearance is consistent with the above explanation when first purchasing the potash fertilizer; secondly, see the bag labeling implementation standards, the Ministry of Chemical Industry of HG/T3279-1990, chlorine The implementation of the national standard GB6549-86 potassium, so in the process, the detection method is different; the third can not simply consider the price, mainly to see its nutrient content. Potassium fertilizers have relatively serious problems and there are many illegal products. Therefore, farmers are advised to ask their distributors for fertilizer inspection reports when they purchase fertilizers. Consult the soil fertilizer station or the fertilizer inspection department to avoid being deceived.
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