1, potassium sulfate. Contains k2o48%-52%, including s18%, commercial fertilizer is light gray or yellowish. Easily soluble in water, it is a high-concentration, quick-acting potash fertilizer with low hygroscopicity and easy to agglomerate. It is easy to store and transport. For chemical neutral, physiological acidic fertilizer. Suitable for all kinds of crops and soils, especially suitable for avoiding chlorine and sulfur-loving crops, such as yam, cruciferous crops, onion and garlic. In acid soil or long-term application, calcium magnesium phosphate fertilizer, phosphate rock powder or other alkaline fertilizers should be used to prevent soil acidification and hardening. In sulfur-depleted soils and vegetables that require more sulfur, such as onions, leeks, and garlic, the effect is good, so it should be used first for crops that are sensitive to chlorine and like potassium and sulfur. Not suitable for use in aquatic vegetables. For application on neutral and calcareous soils, organic fertilizers must be applied. For sandy soils with poor water retention and fertility retention, they should be combined with base fertilizer and top dressing separately.
Can be used as base fertilizer, top dressing, seed fertilizer and foliar fertilizer. Top dressing should be applied early. For basal fertilization and top dressing, concentrated fertilization methods are applied at the site, in the furrow, and at the point of application. The application rate is 7.5-15 kg/667 m2. Fertilizer dosage is 1.5-2.5kg/667m2. Foliar fertilizer concentration is 2%-3%.
2, potassium chloride. The k2o content is 60%, and the commercial fertilizer content is 50%-60%. It is white or light yellow or light brick red crystal. Soluble in water, hygroscopic, easy to store for a long time. It is a chemically neutral, physiologically acidic fertilizer suitable for all kinds of soils other than saline soils. In acidic soils or soils with long-term application of large amounts of potassium chloride, pay attention to the application of organic fertilizers, calcium magnesium phosphate fertilizers, phosphate rock powder or other alkaline fertilizers (such as lime and lime substances, etc.). Long-term application of potassium chloride in neutral soil should be accompanied by calcium fertilizer. Under the conditions of melon and fruit vegetables and under protective cultivation, potassium chloride should be applied reasonably or in small quantities according to the crop and soil conditions. It is strictly forbidden to use double chlorine fertilizers made of potassium chloride and ammonium chloride. For application on sandy soils, organic fertilizers should be used in combination with small amounts. In the dry season, the amount of potassium applied to the soil needs to increase appropriately. Can be used as basal fertilizer, top dressing, not as a fertilizer. When basal fertilizer is used on neutral and acidic soils, it should be used together with organic fertilizers, phosphate rock powder, etc. It is advisable to apply early when dressing, and the application amount is generally 5-15kg/667m2. The amount of basal fertilizer can be slightly more than top dressing. Chlorine-free crops such as potatoes should not be used. Potassium sulfate and other potassium-free potash fertilizers can be used.
3, plant ash. For the straw, corn stalks, cotton stalks, rape stalks, litter, husks and other plant residues after the combustion of residual ash. It mainly contains potassium, phosphorus, calcium, magnesium, sulfur, silicon and various trace elements, but mainly potassium and calcium. The potassium form is mainly potassium carbonate, followed by potassium sulfate. For quick-acting basic potassium fertilizer. Avoid rain blister during storage. It should not be mixed with ammonium nitrogen fertilizer, water-soluble phosphate fertilizer and fully mature organic fertilizer (such as human and animal urine). Rich in calcium, can not be mixed and mixed with superphosphate. Suitable for all kinds of soils other than saline soils, especially for acidic soils.
It can be used as basal fertilizer, top dressing and cover seed fertilizer, and can also be used for top dressing. The dosage is 50-100kg/667m2. Before application, add a small amount of water to make it moist. When used as a basal fertilizer, it should be applied centrally, using a furrow or a hole, about 10cm deep, and covering the soil after application. When used as top dressing, it can be sprayed. When used as a cover fertilizer, it is used as a vegetable bed cover. With 1% ash water leaching solution for extra-root fertilizer, can also prevent aphids.
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