It is not only economical, safe, and effective to manage crop pests and diseases using plant ash, but it also helps reduce the need for chemical pesticides. Additionally, it acts as a natural fertilizer, does not harm beneficial insects, and is environmentally friendly. This makes it a versatile and sustainable solution that is well worth promoting in agricultural practices.
Plant ash is a rich source of essential nutrients, including potassium, phosphorus, calcium, magnesium, sulfur, and trace elements such as boron, manganese, copper, zinc, and molybdenum. To use it effectively, mix 10 kg of plant ash with 50 kg of water, let it soak for 24 hours, then filter the solution and spray it on crops to control aphids. During the seedling stage of cotton, applying 20–25 kg of plant ash per 667 square meters around the ridges can help raise soil temperature and reduce the occurrence of diseases like cotton blight, anthrax, and red rot.
Before planting onions, garlic, or leeks, apply 20 kg of plant ash per 667 square meters into the furrows. During the seedling stage of these vegetables, spraying 15 kg of ash per 667 square meters and then scratching and covering the soil can help prevent root rot and increase vegetable yields by 15% to 20%. When wheat sheath blight appears early, spreading 30–40 kg of plant ash per 667 square meters over the base of the wheat plants when morning dew is still present can help slow the spread of the disease.
For fruit trees suffering from root rot, first loosen the soil around the roots, gently remove the diseased parts, allow the roots to dry slightly, and then bury 2.5–5 kg of plant ash around each tree. Within about 1–2 months, the affected trees may begin to grow new roots and recover. Using plant ash in this way not only supports plant health but also contributes to long-term soil fertility and ecological balance.
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