In acidic soils, the excess sulfate may aggravate soil acidity and even increase the toxicity of active aluminum and iron to soil. In flooded conditions, excessive sulfate will be reduced to generate hydrogen sulfide, so that damage to the root black. Therefore, the long-term use of potassium sulfate and farm manure, alkaline phosphate and lime with, reduce acidity, in practice, should also be combined with drainage measures to improve ventilation. Second, in calcareous soils, sulfate and calcium ions in soil to form insoluble calcium sulfate (gypsum). Too much calcium sulfate will cause soil compaction, this time should pay attention to increased manure application. Third, the focus on the avoidance of chlorine crops, such as tobacco, tea, grapes, sugar cane, sugar beet, watermelon, potato and other potassium sulfate not only increased yield, but also improve quality. Potassium sulfate price than potassium chloride expensive, less supply, should focus on the use of chlorine-sensitive and hi-K potassium hi-cash crops, the benefits will be better.
Potassium sulfate chemical neutral, physical acidic fertilizer, widely applicable to all types of soil and a variety of crops, in particular, avoid chloride, potassium sulfate instead of potassium chloride, a good potash fertilizer. The specific use of the main methods are:
(1) can be used as base fertilizer. Dryland with potassium sulfate as basal fertilizer, be sure to deep casing, in order to reduce the potassium crystal fixed, and conducive to crop root absorption, improve utilization.
(2) for top dressing. As the potassium in the soil mobility is small, should focus on the application of facilities or points to the root system is more dense soil layer to promote the absorption.
(3) can be used as fertilizer and root top dressing. For the kind of fertilizer acres of the amount of 1.5 to 2.5 kg, can also be formulated into 2% to 3% solution, for root dressing.
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