Yam, alias yam, potato, pedicel, etc.; yam is a cultivar in the genus Dioscorea, which can form underground meaty roots, annual or perennial vines. Native to tropical regions of eastern Asia. It is generally believed that one of the major potatoes is native to East Asia; the common yam is native to China; the potato is native to Japan; and the yellow sole is native to South Asia. China has been cultivated since ancient times, and it has been widely distributed. It has been cultivated both in the north and the south, and cultivated in the alluvial soil areas of old waste rivers in the provinces of Jiangsu, Shandong, and Henan. It is served with roots and is rich in nutrients. It can be fried, cooked, distilled, dried and used as a nourishing and nourishing agent, and has an auxiliary effect on weakness, chronic enteritis, and diabetes. Per 100 grams of edible portion contains protein 1.5 grams, sugar 14.4 grams, crude fiber 0.9 grams, carotene 0.02 milligrams, vitamin B 10.08 milligrams, vitamin B2 0.02 milligrams, vitamin C4 milligrams, calcium l4 milligrams, phosphorus 42 milligrams, iron 0.3 mg. It is not only a vegetable, but also a nourishing and strengthening agent with high medical value. At the same time, it is one of the important vegetables for export in China. Features and characteristics After planting in spring, it can sprout new vines. Stems are more than 3 meters long, right-handed, often purple, round or prismatic. The leaves are heart-shaped or arrow-shaped. There are 1-3 buds (air tubers, also known as zero sons, yam eggs) between the leaves, which can also be used for breeding and eating. The underground hypertrophic roots are divided into clubs, palms, and blocks. The surface of the skin is rough, yellowish-brown or dark brown, and the surface is dense with fine roots. The flesh is white and lavender. In summer, the leafhoppers are clustered with pale yellow, brown or apricot flowers, which are spike-like, dioecious, rarely fertile, and cultivated on multiple lines for asexual reproduction. Yam requires a high temperature and a dry climate. The root of spring begins to germinate at a temperature of 10°C. The optimum temperature for growth is 25-28°C, and it grows slowly below 20°C. The above-ground parts suffer from frost and die. The roots are resistant to cold, they do not get cold at 0°C, and they can even pass winter at 15°C. The long growing period takes about 180 days. Short days favor the formation of tuberous roots and aerial tubers. For soil requirements, the best is sandy loam with loose soil, water and fertilizer, and deep, fertile soil. The deeper the soil, the bigger the roots and the higher the yield. In the slightly sticky soil cultivation, the roots are short, but the organization is dense, good quality, yam bogey continuation. China Agricultural Network Editor