1, land selection: It is best to choose sandy soil with high terrain, very deep soil layer, good drainage and dryness, and loose land is the best, although it is good to achieve the same properties of the soil layer, it is best to be slightly acidic.
2. Ditching and soil preparation: It is more suitable to plant long-rooted varieties according to the row spacing of about 1 m. The width of the 3 ditches on the land is 27 ~ 31cm and the depth is 145 cm. The excavated soil should be placed on two sides of the ditch according to the upper and lower layers. After several days of drying, the soil in the lower layer should be leveled and compacted first, and it should be leveled and compacted every 20 cm, starting from the lower layer to the upper layer, and all the sundries should be cleaned up.
3. Apply sufficient base fertilizer: after sowing and planting, until emergence. After that, turn the soil between two rows of the planting ditch18 ~ 28 cm deep, and apply the base fertilizer into it.
Second, the planting time
It is most suitable for planting in North China in late April, in the Yangtze River valley in the first half of April, and in South China from March to April. Generally speaking, the basic planting time is in April.
Extended data Chinese yam grows on hillsides and valleys at an altitude of150-1500m, in thickets or weeds beside streams and roadsides. Dioscorea is a short-day and warm-loving crop. Optimum temperature for seedling growth 15-20℃.
The optimum growth temperature is 25-28℃, and the growth is slow below 20℃. It is suitable to grow in loose, fertile and deep soil, but flat species 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%.
Distributed in Korea, Japan and China; In China, it is distributed in Henan, south of Huaihe River in Anhui, Jiangsu, Zhejiang, Jiangxi, Fujian, Taiwan Province, Hubei, Hunan, Guangdong (Niutou Mountain in Zhongshan), Guizhou, northern Yunnan (Gongshan, Deqin and Lijiang), Sichuan, eastern Gansu and southwestern Shaanxi (350-1500m).
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