Yam is a food and medicine that is used as a product of underground tubers. Due to its tuber hypertrophy, some varieties are as deep as 1-2 meters in depth, and need to use deep, well-drained sandy loam. The main branches and leaves of the yam during the seedling stage and the vine-bearing stage are mainly nitrogen fertilizers. After budding, it enters a period of prosperous growth. Underground tubers begin to expand, requiring a large amount of fertilizer, which is a critical period for fertilization. NPK needs to be applied in conjunction with it.
Before the yam basal fertilizer is applied, 2000-4000 kg of farmyard manure and 60-80 kg of compound fertilizer are applied per acre, and then turned to 30 cm.
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