For a long time, wheat straw, corn stalks, cotton wood, branches, leaves and leaves have been used as fuel in the vast rural areas. The ash produced by burning has contained various ash elements such as phosphorus, potassium, calcium, magnesium and various trace elements. The amount of potassium and calcium is relatively large, and it is generally regarded as potassium fertilizer. Plant ash contains a variety of potassium salts, of which potassium carbonate is the main, followed by potassium sulfate, potassium chloride content is low, generally containing potassium (K2O5) 5% -10%. Potassium in plant ash is 90% soluble in water and is a potent potassium fertilizer. Grass ash can be used as base fertilizer, seed fertilizer or top dressing. Its aqueous solution can also be used for top dressing. Potato seed dressing with grass ash has both bactericidal and certain nutritional effects.
However, pay attention to the following issues in storage and application:
(1) Since the fertilizer is mainly composed of potassium carbonate, it is an alkaline fertilizer. It cannot be mixed with ammonium nitrogen fertilizers, nor can it be mixed with organic fertilizers such as human waste and circulatory fertilizers to avoid the loss of nitrogen. In rural areas, it is often wrong to sprinkle plant ash in the pit or pigsty.
(2) The correct method for storing the ash is to store it separately in the room to prevent wind and rain. The effluents of trees and ash washed by water are very poor.
(3) The plant ash is usually suitable for centralized application. The depth of application is about 10 cm and the soil is covered immediately after application. The ash texture is light, easy to fly and inconvenient when applied. Therefore, it can be mixed with 2-3 times wet soil before application, or sprayed with a small amount of moisture to make it moist, and then applied again.
(4) The plant ash should be applied preferentially to crops that are sensitive to chlorine but prefer potassium, such as tobacco, potato and sweet potato.
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