Yam has been eaten by humans since ancient times and is one of the earliest plants consumed by humans. As early as the Tang Dynasty poet Du Fu's poems, there is a famous line that "the intestines are full of yam". Yam tubers are thick, juicy, sweet, sticky, and delicious when eaten raw or hot.

1. Different appearance

Huaiyam: The surface is yellow-white or light yellow, with longitudinal grooves, longitudinal wrinkles and fibrous root marks, and occasionally light brown skin remains. It is heavy and solid, not easy to break, and its cross section is white and powdery with small dot-like protrusions. It has a slight odor, a light taste, a slight acidity, and is sticky when chewed. ?

Iron bar yam: As the name suggests, it is hard and straight in appearance, like an iron bar. Tieguang yam is relatively thin and will ache when pinched. The skin is earthy yellow or earthy brown, with smooth skin and white spots. The fibrous roots are long and dense, the hair eyes are prominent, and the reed head is tapered and long (20~30 cm). , sometimes with red irregular spots. When broken open, the cross section of Tieguang yam is whiter and the fiber is thinner.

2. Different origins

There are many origins of yam. It is very popular in Anhui, Jiangsu and other places in my country. In addition, it is also very popular in Guangzhou. many. Although it is grown in different places, its popularity is very high because everyone likes its taste and is also very concerned about some of the health care effects it brings. Therefore, this kind of yam is now also grown in many areas. Not only can it be eaten as a vegetable, but it can also be used as a dietary therapy to treat diseases.

The origin of Tieguan yam is Wen County, which is located in the upper reaches of the intersection of the Yellow River and Qin River. The mother river Yellow River and the Qin River originating from the Taihang Mountains both nourish this land. Surrounded by mountains on three sides and facing water on one side, it enjoys unique natural conditions.

The land in the county is divided into sandy soil near the Yellow River and sandy clay near the Qinhe River. The dividing line is roughly the current Changdian-Daquhe-Xiaonanzhang-Xulu Village line, and to the north is Qinhe clay soil and Yellow River sandy soil to the south. According to the experience of local yam growers, Qinhe clay soil is more suitable for growing yam. ?

Extended information:

1. As a highly nutritious food, yam contains a large amount of protein, carbohydrates, B vitamins, vitamin C, vitamin E, glucose, crude protein amino acids, and bile. Nutrients such as alkali, allantoin, iodine, calcium, iron, phosphorus and other indispensable inorganic salts and trace elements for the human body.

2. Distribution range: Distributed in Northeast China, Hebei, Shandong, Henan, Jiangsu, Zhejiang (450-1000 meters), Jiangxi, Fujian, Taiwan, Hubei, Hunan, Guangdong, northwestern Guangxi, Guizhou, Sichuan (700-500 meters), eastern Gansu (950-1100 meters), southern Shaanxi (350-1500 meters) and other places. It is also distributed in North Korea and Japan.

3. Growth environment: Grows on hillsides and valleys, in bushes or weeds by streams, roadsides. It likes light and has poor cold tolerance. It should grow in well-drained, loose and fertile loam. Avoid waterlogging.

History of Tiegun Yam:

Tiegun Yam is one of the many varieties of yam. The quality of Tiegun yam will vary due to different planting areas and different planting intervals. Among them, Huaishan medicine produced in ancient Huaiqing Prefecture has higher medicinal value. Huaiyam mainly refers to the yam produced in ancient Huaiqing Prefecture (its geographical scope is equivalent to Wenxian, Qinyang, Wuzhi and Mengzhou in Jiaozuo District, Henan Province today).

"Shen Nong's Materia Medica" states that Dioscorea, also known as potato, is used medicinally for its roots. Because its medicinal effect is comparable to that of ginseng, it is also called "Huai Ginseng".

It is recorded in "Jiaozuo Zhi" and "Agricultural Science Series" of the Qing Dynasty. It is valuable in both food and medicine.

Baidu Encyclopedia - Huaiyam

Baidu Encyclopedia - Iron Bar Yam

?