Plant ash is the residue after plant burning, containing 6% to 12% of potassium oxide, also contains more calcium and phosphorus, but also contains trace elements such as magnesium, sulfur, boron, zinc, molybdenum, copper, etc. It is an ideal High-quality farmyard fertilizer. For a long time, the energy sources of life in the vast rural areas of our country are mainly straws, branches, leaves, etc. Therefore, ash is an important potassium fertilizer source in rural areas. Although plant ash is commonly used in agricultural production, it must be used scientifically in order to give full play to its fertilizer efficiency. Reasonable use of plant ash should focus on the following aspects: 1. Plant ash contains various potassium salts, of which potassium carbonate is the main, followed by potassium sulfate and a small amount of potassium chloride, belonging to the physiological alkaline fertilizer, so the plant ash It cannot be mixed with ammonium nitrogen fertilizer; nor can it be mixed with organic fertilizers such as human waste and circulatory fertilizers. In order to increase the efficiency of plant ash fertilization, it is necessary to carry out a single plot and apply it separately. 2. The potassium salts contained in the plant ash are more than 90% soluble in water and are readily available potassium fertilizers. According to this characteristic, ash can be used as basal fertilizer, seed fertilizer and topdressing fertilizer, and its aqueous solution can also be used for top dressing. In the paddy fields, ash can be used as a cover fertilizer in paddy rice fields to supply nutrients for seedlings, increase ground temperature, reduce moss, prevent rotting, loosen the topsoil, and facilitate rafting. In the production of cotton, it can be used as seed dressing after seed soaking, which is not only beneficial to the dispersion of seed, but also facilitates the seeding, and has a certain nutritional effect. 3. It is advisable to use the plant ash in a centralized manner, and use the planting methods and acupuncture points to apply it. The depth is 8 to 10 cm and the soil is applied after the application. Before use, mix 2 to 3 times of wet soil or spray with a little moisture before use to prevent ash from flying. 4. The source of plant ash is limited. It should be given priority to apply to potassium-depleted soil in order to give full play to the fertilizer efficiency of plant ash. In general, most of the sandy soil with coarse soil texture is potassium-deficient soil, and the effect is very obvious after the application of plant-wood ash. Therefore, limited plant ash should be applied preferentially to soil with lighter texture, so as to obtain better economic benefits. Followed by the preferential application of hi potassium crops, such as potatoes, sweet potatoes, sugar beet, cotton and legumes, the amount of mu is generally 30 ~ 50 kg is appropriate.
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