Many people know that yam has rich nutritional value such as strengthening the spleen and stomach, helping digestion, benefiting the lungs and relieving coughs, lowering blood sugar and prolonging life. Recently, due to last year's yam production cuts, this year's yam prices have been on the rise, July 16, the average price of yam is 15.0 yuan / kg, compared with the same period last year, an increase of 382.57%. Take July as an example, July 16, '06 yam average price of 5.7 yuan / kg, July 16, '07 yam average price of 1.5 yuan / kg, '08 average price of 3.5 yuan / kg, '09 average price of 15.0 yuan / kg. From the market statistics department, the market yam mainly from Baoding, Shandong, Henan, Anhui and other places. Among them, mainly in Baoding, due to the impact of weather reasons, to the Baoding area of yam production, and the reduction of yam planting area in 2008, so that the price is always higher than the same period last year. In addition, the main reason for the increase in yam prices is due to 07 yam prices are too low, reducing the enthusiasm of growers, making 08 planting area reduction; In addition, due to the summer and summer seasons, high temperatures, the folk often use the method of eating medicine porridge to health care body, such as corn yam porridge to prevent gastritis and other diseases, lentil flower yam porridge to treat summer summer outside the summer dampness and other health care porridge, so that the consumption of yam increased. On the other hand, the increase in yam deep-processed product varieties, such as yam drinks (yam powder, etc.), yam leisure food, etc. is also one of the factors that increase the price of yam this year. It is expected that the new yam market to September, when the price of yam will fall.