It is jicama, also known as sago, cool potato, groundnut.

The jicama, also known as sago, cool potatoes, groundnut. Native to southern China, Mexico, Central and North America. It is more widely cultivated in Sichuan and Chongqing areas of China, Shaoxing Shengzhou City of Zhejiang Province and Taiwan Province.

Sweet potato belongs to the Fabaceae family, the cultivated species of the genus Sweet Potato that can form tuberous roots, annual or perennial twining herbaceous vines. The tuberous roots of sweet potatoes are fat, white and juicy, rich in sugar and protein, but also rich in vitamin C. It can be eaten raw, but also cooked.

The root system is strong, drought and barren tolerance. In the main root near the stem end of the accumulation of nutrients and the formation of tuberous roots, flat round or fusiform, with shallow longitudinal grooves, the epidermis yellowish, skin thin and tough, easy to peel. The edible part is composed of thin-walled cells, especially developed secondary xylem. The stem is trailing, 1.5~2 meters long, with right-handedness. The leaves are ternately compound.

Cool potatoes to weathered, permeable, well-drained yellow soil is preferred. Sex like warmth, heat resistance, growth temperature of 25 ~ 30 ℃, flowering and fruiting period especially need higher temperatures. Long growing period, early sowing or early planting of seedlings can make full use of the warm season. Tubers are fat, white, crisp and juicy, rich in sugar and protein, and rich in various vitamins. It can be eaten raw or fried.