2. The main ingredient of grass ash is potassium carbonate. Potassium carbonate is a strong base and weak acid salt, hydrolysis occurs in water to produce OH- ions, grass ash is widely used in rural areas of a kind of agricultural potash fertilizer. The main component of grass ash is potassium, which is a kind of organic fertilizer rich in potassium, calcium and phosphorus, and also contains a small amount of boron, aluminum, manganese and other trace elements. It is suitable for acidic soil or clay soil, especially for sweet potatoes, potatoes and other chlorine-avoidant crops, and can also be used as a mulch for nursery and seedling.