First, the physical properties:
Potassium sulfate: soluble in water, K2O content of 50%, white or light red crystal, better physical properties than potassium chloride, hygroscopicity, storage is not easy to agglomerate, is acidic fertilizer.
Potassium chloride: quick soluble potassium water, K2O content of 50-60%, white or light yellow or purple, hygroscopicity, can be caking in storage, pay attention to rain, moisture and packaging damage, An acidic fertilizer.
Second, the appropriate application of crops:
Potassium sulfate for a variety of crops, especially cruciferous crops such as sulfur is particularly effective for potassium sulfate less than potassium, due to potassium sulfate in the paddy field is easy to produce hydrogen sulfide poisoning, potassium chloride should be applied. Tobacco, sugar cane, potato, grape, citrus and other crops are like potassium crops, but chlorine resistance is weak, it should not be applied potassium chloride, so as not to reduce product quality.
Appropriate use of potassium chloride can improve the yield and lodging resistance of crops such as rice, wheat and corn. It is very effective for food crops such as rice, wheat and corn which are resistant to chlorine, but can not be applied to tobacco, sugarcane, potato , Tea, sugar beet and so avoid chlorine crops.
Third, the amount of potassium:
Potassium sulfate potassium content is generally 50% to 53%, and does not contain chloride ions.
Potassium chloride content is generally 60% to 63%, containing a large number of chloride ions.
Fourth, the implementation of standards:
Potassium sulfate is the implementation of the former Ministry of Chemical Industry promulgated HG / T3279-1990.
Potassium chloride implementation of the national standard GB6549-86.
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