昌黎县从1988年以来大力推广地膜土豆大芽移栽新技术,取得了良好的经济效益和社会效益,深受广大农民的欢迎。全县推广面积已由初期的120亩发展到1996年的8万多亩,其技术规程不断得以完善和提高。实践证明,地膜土豆采用大芽移栽有四点好处:一可有效地利用早春拟温,把播期提前,提高时空利用率;二可提早15～20天收获,在蔬菜淡季上市;三可采用地膜土豆套种春玉米,复种秋菜花模式,实现吨粮田、双 Since 1988, Changli County has been vigorously promoting the new technology of transplanting large-sized plastic potato buds and has achieved good economic and social benefits. It has been well received by farmers. The promotion of the county area from the initial development of 120 acres to 1996, more than 80,000 acres, its technical regulations continue to be improved and improved. Practice has proved that the use of large potato bud potato transplanting has four advantages: one can effectively use the early spring to simulate the temperature, the sowing date in advance to improve space-time utilization; two can be harvested 15 to 20 days earlier, the vegetables in the off-season market; The use of plastic filming intercropping spring maize potatoes, multiple cropping patterns of autumn vegetables to achieve tons of grain, double