Potassium sulfate and potassium chloride are physiological acidic fertilizers, but contains different ingredients, into the soil, the soil physical and chemical properties and growth and development of different crops, also have a great impact. In order to improve the utilization of potassium fertilizer, application should be “five to”.
To be applied to the potassium-deficient soil soil fertilization experience according to the formula, the effective potassium content of less than 80ppm, especially below 50ppm of potassium-deficiency soil, potassium fertilizer is low, the effect of potassium fertilizer production is the most significant. Cold field, muddy field, peat field, although organic matter content is high, but the groundwater level is high, water temperature is low, microbial activity is poor, slow decomposition of organic matter, available potassium content is very small. However, these types of fields, should not be applied potassium sulfate, if the application of its sulfate in the hypoxic conditions, will be reduced to hydrogen sulfide, toxic gas can make rice black root, rot, resulting in rice seedlings, it can only Application of potassium chloride or other potash fertilizer.
To nitrogen, phosphorus and potassium with nitrogen, phosphorus and potassium with the application, in order to promote each other, give full play to the effectiveness of the fertilizer. Potash fertilizer should be applied at the same time with nitrogen and phosphorus fertilizer, and farm fertilizer with the role of better. Potassium fertilizer applied to the soil, the clay can absorb more potassium, less loss, and poor adsorption capacity of sandy soil, quick loss of potassium easily, so the clay can be more than one application of potassium fertilizer.
To apply early deep clay soil, potash fertilizer is generally used as a basal fertilizer, before planting or transplanting a one-time application; heavy clay, neutral soil available potassium total 2/3 or 1/2 for basal, the rest for top dressing Early application; sandy soil and leaking fields, should be sub-topdressing in order to reduce the loss of potassium. Crops should be used as basal full-layer facilities or ditch dug facilities, top dressing should also ditch facilities, digging facilities, Shi after casing. Fertilization depth should be moderate, most of the crop roots are concentrated in the 10-25 cm soil layer, so as the base fertilizer full layer facilities, facilities, facilities should be 10-15 cm below; top dressing can not be shallow than 8-10 cm.
To the amount of application of moderate amount of potassium fertilizer is not enough to achieve the role of potassium to promote production, while the amount is too much, the economic benefits will decline. This is because in a certain range, the crop yield is increased with the increase in the amount of potassium fertilizer delivery, but the yield per kilogram of potash efficiency, are with the increase in the amount of potassium decreased. Therefore, in the potassium-deficient soil, generally acres of potassium sulfate 7.5-10 kg, 6.5-8.5 kg of potassium chloride is more moderate. While hybrid rice, potato, cotton, peanut and other crops like potassium, potassium fertilizer can be a corresponding increase.
To avoid excessive long-term excessive application of potassium sulfate and potassium chloride over the years of application, will make soil acidification, acidity in the soil will increase the acidity, if applied a certain amount of lime, can neutralize soil acidity, for crop growth to create appropriate Soil environment. In addition, the calcareous soil for many years the application of potassium sulfate is not good. Excessive application of potassium sulfate for many years, sulfate ions and soil calcium combined to produce calcium sulfate. In the rain and irrigation leaching, will cause soil pore blockage, ground knot, calcium decreased, therefore, potassium sulfate and potassium chloride should be applied rotation
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