我县地处金衢盆地的低丘红壤。甘薯是旱地的主要作物,常年种植面积约3万亩左右,由于土壤粘、瘦,夏秋干旱严重,品种退化,栽培技术落后,以致常年鲜薯亩产只有2000斤左右,而且产量不稳,随伏旱程度轻重而波动。为了切实改变低丘红壤甘薯低产面貌,自1983年起先后在省农科院、省农 My county is located in the Jinqu basin hilly red soil. Sweet potato is the main crop in dry land. The perennial planting area is about 30,000 mu. Due to soil stickiness, leanness, severe summer and autumn droughts, variety degeneration and backward cultivation techniques, perennial fresh potato yields only about 2,000 kg, and the yield is not stable. Volatile degree fluctuates. In order to effectively change the hilly red sweet potato low-yield appearance, since 1983 successively in the provincial Academy of Agricultural Sciences, provincial agriculture