重庆市万盛区金桥乡范家村社员霍仁录的承包田属冷砂田,土质粘重,酸性较强,稻苗长势差,年年稻瘟病危害严重,采用稻瘟净、异稻瘟净、三环唑等农药防治后,效果不理想,轻则减产10～20%,重则减产50%以上,亩产仅150～200公斤左右。1992年,霍仁录在农技干部的指导与帮助下,亩用 Chongqing Wansheng District Jinqiao Township Fan Village members Huo Ren recorded the contract field is cold sand fields, soil sticky, strong acidity, rice seedlings growing poor, year after year, the serious harm of blast, the use of blast net, different blast plague, tricyclic Azoles and other pesticide control, the effect is not satisfactory, ranging from 10 to 20% cut, while the weight reduction of more than 50%, only 150 to 200 kg per mu. In 1992, Huo Ren recorded the guidance and help of agricultural cadres, mu