How to choose potassium?

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/2016-08-23
/By Huifeng Runda

How to choose potassium?

Rational use of potassium is necessary to consider the following points:
The role of potassium sulfur nutrition can provide potassium or sulfur improve crop nutrition, when the soil available sulfur (S) is less than 12 mg / kg, the crop will generally sulfur deficiency. In the following cases easier to lack: ① away from the town, by the chimney and dust less polluted areas; ② long to DAP instead of superphosphate and rock phosphate, urea, ammonium sulfate, ammonium bicarbonate instead of that not applied sulfur fertilizer areas, particularly in northern and other remote northwest and northeast regions; ③ long-term organic fertilizer, soil fertility degradation or lack of administration is more serious, which may be higher than field crops of vegetables, fruit trees easier to sulfur deficiency; ④ saline-alkali soil and sand larger areas, soil sulfur deficiency, potassium or chlorine, more than other areas need to be administered potassium; ⑤ soybean, canola and other hi sulfur crops may be more a lack of sulfur, or need potassium fertilizer than other crops.
Potassium is a physiological acidic fertilizer due to the relatively large number of crop uptake of potassium ions or faster than the absorption of sulfate ions can cause rhizosphere soil acidification, thereby increasing the effectiveness of soil phosphorus and trace elements in nutrients. This is especially important for physiological acidification northern rice seedling. In order to cultivate strong seedling and reduce pests and diseases, requires seedbed soil nutrition soil or pH control in rice seedling 4.5-5.5, for which, in addition to administration of ammonium nitrogen with sulfuric acid and an appropriate amount of water to the outside, potash potassium sulfate should be used, administered 50 grams per square meter, or per seedling tray administered 5 grams. This rhizosphere soil acidification helpful.
Potassium fertilizer to improve the relevance of various soil and crop potassium has a broad spectrum, but its high price, it is better to make the steel blade. When there are several different soils and crops the same time, to give priority to the crop or the soil is most needed, such as fruit, vegetables and other cash crops more general field crops need more potassium; field crops, legumes, oilseed rape, potatoes and sugar crops need more than other crops, application of potassium; alkali soil arid and sandy soils need more general application of potassium.
Balanced fertilization balanced fertilization mentioned here refers to combined application of nitrogen and phosphorus and potash fertilizers and other nutrients. A large number of production practices and scientific experiments proved that only the crop but lack the necessary nutrients with the administration, and in close coordination with other agricultural production measures, in order to achieve high-quality, high yield, high efficiency and the overall efficiency of the goal of environmental protection. Paying particular attention by soil testing, fertilizer, fertilizer will be controlled at a suitable level to prevent excessive potassium caused a crop calcium, magnesium deficiency.