How to use plant ash?
Ash is a widely used natural fertilizer, composed of the remnants from burned plant materials such as straw, firewood, and animal litter. It is rich in potassium, making it an effective source of this essential nutrient for plants. The color of plant ash typically ranges from gray-black to black, and it contains no nitrogen or organic matter—only mineral residues, with potassium and calcium being the most prominent elements.
The potassium in plant ash mainly exists in the form of potassium carbonate, along with small amounts of potassium chloride. Over 90% of this potassium is water-soluble, allowing it to be quickly absorbed by plants, which makes it highly efficient as a fertilizer.
Plant ash is classified as an alkaline fertilizer and should not be mixed with ammonium-based fertilizers like ammonium sulfate or ammonium nitrate, as this can lead to rapid nitrogen loss through evaporation. It should also not be combined with human or animal waste, as this can reduce its effectiveness and cause nutrient runoff.
It is suitable for most soil types except saline soils, and it particularly benefits acidic soils. Plant ash can be used as a base fertilizer or top-dressing. A typical application rate is about 50-100 kg per mu (approximately 667 square meters). Before applying, it should be mixed with moist soil, but excessive water should be avoided to prevent nutrient leaching.
In potting, plant ash can be mixed with soil in a proper ratio to improve potting conditions. It not only provides potassium but also helps loosen the soil, improves drainage, and promotes healthy root development. Whether you're preparing cutting soil, sowing seeds, or growing potted plants, plant ash is a versatile and beneficial addition to your gardening routine.
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