1. Potassium sulfate. Containing K2O 48%-52%, containing S18%, the commercial fertilizer is light gray or yellowish. Soluble in water, high concentration of quick-acting potassium fertilizer, low hygroscopicity, not easy to agglomerate, easy to store and transport. It is a chemically neutral, physiologically acidic fertilizer. Suitable for a variety of crops and soils, especially suitable for chlorine, sulfur-loving crops, such as yam, cruciferous crops, onion and garlic. Calcium magnesium phosphate, phosphate rock or other alkaline fertilizer should be applied to acid soil or long-term application to prevent soil acidification and compaction. It is effective in the application of sulfur-deficient soil and vegetables requiring more sulfur such as onion, leeks and garlic. Therefore, it should be used first on crops that are sensitive to chlorine and potassium. It is not suitable for application in aquatic vegetables. Applied on neutral and calcareous soils, combined with the application of organic fertilizers. The sandy soil with poor water retention and fertilizer retention capacity should be applied separately according to the base fertilizer and top dressing.
Can be used as base fertilizer, top dressing, seed fertilizer and foliar fertilizer. For top dressing, it should be applied early. For base fertilizer and top dressing, the method of concentrated application of strip application, ditch application and point application is adopted, and the application amount is 7.5-15kg/mu. The amount of seed fertilizer is 1.5-2.5kg/mu. Foliar fertilization concentration is 2%-3%.
2. Potassium chloride. The K2O content is 60%, and the commercial fertilizer content is 50%-60%, which is white or light yellow or light brick red crystal. Soluble in water, hygroscopic, long-term storage and easy to agglomerate. It is a chemically neutral, physiologically acidic fertilizer suitable for various soils other than saline and alkaline soils. In organic soils or long-term application of potassium chloride in large amounts of soil, attention should be paid to the application of organic fertilizers, calcium magnesium phosphate fertilizer, phosphate rock powder or other alkaline fertilizers (such as lime and lime). Long-term application of potassium chloride on neutral soil should be accompanied by calcium fertilizer. Potassium chloride should be applied reasonably or in small amounts according to the crop and soil conditions on the melon and fruit vegetables and under the cultivation conditions. It is strictly forbidden to apply the double-chlorine fertilizer made of potassium chloride and ammonium chloride. Application on sandy heavy soil should be combined with the application of organic fertilizer, and should be applied in small portions. In the dry season, the amount of potassium applied to the soil needs to increase appropriately. Can be used as base fertilizer, top dressing, not suitable for seed fertilizer. When used as a base fertilizer, it should be blended and mixed with organic fertilizer, phosphate rock powder, etc. on neutral and acidic soils. It is advisable to apply early when topdressing, and the application rate is generally 5-15kg/mu. The application rate of the base fertilizer can be slightly more than the top dressing. Avoid chlorine crops such as potatoes, etc., and use potassium sulfate and other potassium ions without chloride ions.
3, grass and ash. It is the residual ash after burning of plant residues such as straw, corn stalk, cotton stalk, rape stalk, litter, and chaff. It mainly contains potassium, phosphorus, calcium, magnesium, sulfur, silicon and various trace elements, but mainly potassium and calcium. The form of potassium is mainly potassium carbonate, followed by potassium sulfate. It is a quick-acting alkaline potassium fertilizer. Avoid rain and blisters when storing. It should not be mixed with ammonium nitrogen fertilizer, water-soluble phosphate fertilizer and fully decomposed organic fertilizer (such as human and animal urine). It is rich in calcium and cannot be mixed and mixed with superphosphate. Suitable for a variety of soils other than saline and alkaline soils, especially for acidic soils.
It can be used as base fertilizer, top dressing and cover fertilizer, and can also be used for top dressing. The dosage is 50-100kg/mu, and a small amount of water is added to make it moist before application. It should be applied intensively as a base fertilizer, using a ditch or a hole application, about 10cm deep, and covering the soil after application. For top dressing, it can be sprayed on the foliar surface. Used as a vegetable seedbed cover when used as a seed fertilizer. Use 1% grass ash water leaching solution for root dressing, which can prevent mites.
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