进入九十年代以来,大兴县甘薯生产发展迅速.据生产调查,每亩薄沙土地一季春甘薯的利润在800～1000元,高于中等水平西瓜生产的收益.为了甘薯产区的农民的收益,群众采取甘曹与地膜西瓜接茬套种的种植方式,不但可以在地上、地下获得高产,而且能实现一膜两用,使低肥力的薄沙土地也能创造出高产高效益 Into the nineties, the rapid development of sweet potato production in Daxing County.According to the production survey, per acre thin sandy land a quarter of spring sweet potato profits in 800 to 1,000 yuan, higher than the average level of watermelon production benefits.In order to sweet potato farmers’ income , The masses take Gan Cao and mulching watermelon cropping intercropping cultivation methods, not only in the ground, underground access to high yield, but also to achieve a dual-purpose film, so that low-fertility thin sand land can also create high yield and high efficiency