The introduction of bow is as follows:

In ancient times, it was like "Mao", yam. An edible herb whose cylindrical root contains starch and protein. Also known as "yam".

Yam is introduced as follows:

Rehmannia glutinosa, Dioscorea opposita, Achyranthes bidentata and Chrysanthemum are also called "four medicines". Iron stick yam is one of many varieties of yam, and it is a fine product in Huai yam. Iron stick yam has traces similar to rust, so it is named iron stick yam.

Iron stick yam has good nutrition and high medicinal value, and has been used as medicine in ancient books. Wen county, Jiaozuo, Henan Province is the geographical indication producing area of iron stick yam. According to the different cultivated soils, iron stick yam can be divided into sandy soil and loessial soil.

The characteristics of yam are introduced as follows:

Iron stick yam can be divided into two types due to different soil quality: iron stick yam with deep soil layer and iron stick yam with sandy soil. Among them, loam iron stick yam is strong in geology and porcelain, strong in viscosity and hard in soil. So twists and turns, although not good-looking, but tastes better; Sandy iron stick yam is planted in the sand, with soft soil, sweet taste and high nutritional value. Cylindrical, 60~80 cm long.

The maximum length can reach more than 100 cm, and the diameter is about 2.5 cm. The epidermis is dark brown, densely covered with fine hairs, and has purple-red dark spots. The meat is extremely delicate, white and yellow, firm and full, silty, with little mucus, and will not rot after long cooking. Fragrant, slightly sweet, very good taste, not greasy after long-term consumption.

Both medicine and food. The iron stick yam skin in loam and sand is very thin, especially after cooking. However, it should be noted that a person's daily amount is kept at about 3~4 Liang, and it is easy to get angry if he eats too much.

Generally, the single weight of iron stick yam does not exceed 250 grams, that is, five taels (but the weight of iron stick yam in sandy soil above 80 cm can reach about 500 grams, depending on planting technology and management).

Due to the low water content of iron stick yam, it is rich in yam polysaccharide, and the juice is thick. After cooking, it tastes dry, greasy and sweet, and it feels "sweet on the face" at the entrance, and it is accompanied by a faint hemp taste when eaten with skin.