Yam's Needed Fertilizer Characteristics and Fertilization Technology

Yam has a long growth period and requires a large amount of fertilizer, especially organic fertilizer with a long fertilizer effect. When fertilizing, basal fertilizers are generally used, supplemented by topdressing.

Need fertilizer characteristics. Yam has a long growth period and requires a large amount of fertilizer, especially organic fertilizer with a long fertilizer effect. As the formation of tubers is accompanied by the accumulation of starch and other substances, the demand for phosphorus and potassium is relatively large. In the early stage of growth, due to the low temperature and slow release of organic nutrients, it is advisable to supply appropriate amount of available nitrogen fertilizer to promote the growth of stems and leaves. The growth of tubers in the mid-to-late growth period requires a large amount of nutrients, especially phosphorus and potassium fertilizers, and special attention must be paid to prevention. Fat and premature aging. The yam is a chlorine-tolerant crop. Excessive chloride ions in the soil will affect the growth of yam, which is characterized by vigorous growth of vines, reduced tuber yield, decreased quality, fragility and breakage, and impatience for storage and transportation. Therefore, it is not appropriate to use chlorine-containing fertilizers.

Fertilization technology. Yam fertilization is generally based on basal fertilizer supplemented by top dressing. Basal fertilizer is mainly composed of high-quality farmyard manure and compound fertilizer that are fully decomposed and can also be applied with nitrogen, phosphorus and potassium. The focus of topdressing is in the period of tuber enlargement. It is necessary to apply appropriate amount of available fertilizer to the plant to promote health and prevent premature decline. Maturity of farmyard manure per acre 2000 to 4000 kg, equal amount of compound fertilizer (18-18-18) 60 to 80 kg (before the application of the two fully mixed), or 2000 kg of organic fertilizer, 25 kg of urea, diammonium phosphate 25 kg, 30 kg of potassium. The basal fertilizer was spread evenly throughout the field before planting. After application, the fertilizer was ploughed into a 30 cm plow layer. The principle of skillful top-dressing is "early weight, medium-term stability, and late-term anti-aging."