山药为多年生蔓性草本植物。一年栽培取其地下块根为食,根质柔滑,风味鲜美,营养丰富,可采药兼用,滋补食疗,近年来,市场对山药的需求不断增大。科学的栽培和管理下,山药亩产可达到3 000~4 500kg,经济效益十分显著。在四川地区主要种植的山药有大白皮山药、小白皮山药两种,其中大白皮山药适应性强、产量高,适宜浅丘陵山区大面积推广。2005年,黄荆沟镇在全县率先引种示范至今。其栽培技术如下: Yam is a perennial creeping herb. One year cultivation take root tuberous root for its food, silky root, tasty, nutritious, can be used both medicine and nourishing diet, in recent years, the market demand for yam growing. Scientific cultivation and management, yam per mu can reach 3 000 ~ 4 500kg, the economic efficiency is very significant. In Sichuan Province, the main planting yam large white yam, small white yam two, including large white yam adaptability, high yield, suitable for large-scale promotion of shallow hills and mountains. In 2005, Huang Jinggou town in the county took the lead in introducing demonstration so far. The cultivation techniques are as follows: