Edible, containing a variety of vitamins and choline. The nutritional value is very high.
To cultivate Chinese yam, it is necessary to plough 35-45 cm sandy soil with fertile soil, deep soil layer, strong water and fertility conservation, good ventilation and convenient irrigation and drainage. When digging the soil deeply, the topsoil of 20-30 cm should be turned aside and then turned to 35-45 cm. It is forbidden to turn over the soil. After the land is deeply ploughed, a cultivation ditch is formed, and base fertilizer can be applied in the cultivation ditch. 20 kg of superphosphate was applied as base fertilizer, 3,000 kg of decomposed organic fertilizer and 200-300 kg of plant ash. When fertilizing, the original topsoil can be filled at the bottom of the planting ditch with a thickness of 15cm, then the base fertilizer is applied on the soil layer, and finally the soil is covered with 15cm.
Yam topdressing is mainly in the middle and late growth stage, and less fertilizer is needed in the early stage. Apply 20% human excrement and urine fertilizer 1 time after the yam emerges neatly, and then apply it 1 time every 20-30 days. When fertilizing, a fertilizing ditch with a depth of 1 6- 10 cm can be dug 30 cm away from the plant, and 700- 1000 kg of human excrement and urine can be applied per mu. When the underground tuber enters the vigorous growth period, it should be topdressing 1 time. Apply 20-30 kg of compound fertilizer and 40-60 kg of cake fertilizer in holes or ditches, and cover the soil after fertilization to ensure the tuber elongation and expansion and sufficient nutrients. Whether topdressing will depend on the growth of plants.