1、 There are several

There are many kinds of yams, seven of which are common. They are common yam, fine wool yam, iron stick yam, Huai yam, Ma yam, Dahe yam and Ganoderma lucidum yam. Among them, tiebang yam is commonly used for eating, while some varieties such as Huai yam have high medicinal value.

2、 Which one is good

1. Common yam: this kind of yam is also a famous dish. It is characterized by coarseness, no rust like spots on the surface, more moisture and easy to break. Its skin is relatively thin. It can be removed with a brush. It feels greasy. Cut with a knife, the cut surface is easy to oxidize. Generally, the cooking time should not be too long, otherwise it is easy to be too rotten.

2. Iron stick Yam: this kind of yam belongs to a good variety. Compared with ordinary yam, its thickness is more uniform, and its diameter is usually between 1-2 cm. It has a lot of hair, dark skin color and dark red rust spots. It is very powdery and greasy. After cutting, the section is white or yellow. If it is usually used for cooking, it will not burn out after cooking for a long time.

3. Huaishan Yam: the original name of Huaishan yam is Huaishan yam. It is a specialty of Jiaozuo City, Henan Province, China. Because it was called Huaiqing mansion in ancient times, the variety produced is called Huaishan yam. The local soil is mostly mixed soil or sandy loam. The soil layer is relatively deep and has a lot of nutrients. Moreover, the sunshine and precipitation are also very suitable, which is very suitable for plant growth.