Yam grows on hillsides, under valleys, in thickets or weeds by streams and roadsides at an altitude of150-1500m. Yam is a short-day and warm-loving crop. The optimum temperature for seedling growth is 15-20℃, the optimum temperature for peak growth is 25-28℃, and the growth is slow below 20℃.
Yam is suitable to grow in loose, fertile and deep soil, but flat and block species can also grow in shallow and sticky soil. Dioscorea opposita is drought-tolerant, but not waterlogging-tolerant, so it is not suitable for planting in soil with too shallow or too humid groundwater level. The water content of sandy soil and loam soil is about 18%.
Extended data:
In the early stage of yam, as long as the topsoil is wet below 5 cm, there is no need to water it. Generally, the top water is poured around the seedling 1 m; About 20 days apart, enter the peak growth period of branches and leaves, and then pour the second water. The first two times of water should be lightly poured, and it is forbidden to flood with water. After the second watering 1 month or so, the tuber will expand rapidly, and if the soil is dry, it should be watered thoroughly. In autumn, pay attention to drainage and flood prevention.
From the end of1October to 1 1 month, when all the stems and leaves wither, tubers will be harvested. Tuber storage is mainly about heat preservation and antifreeze, and the suitable temperature is 2-4℃ and the relative humidity is 80-85%. Can be stacked, buried or cellared. In the warm south of China and the Yangtze River valley, it can be listed with the collection. Reiyoshi must mature and harvest.