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国家重点科技攻关项目——北方贫水区水稻覆膜直播技术研究在河北省承德县获得成功。去年采用这一新技术直播的２万亩（６６７米勺水稻获得普遍高产，平均６６７米’产达５８９公斤，最高单产达７２０公斤，每６６７米’覆膜直播稻可比播秧稻增收节支１５０元以上。由承德县承
National Key Scientific and Technological Project - Research on Direct Seeding and Covering Technology of Rice Covering in Poverty Area of North China Successfully Implemented in Chengde County, Hebei Province. Last year, 2 million mu of live broadcasts of this new technology (667m spoons of rice were generally high-yielding with an average yield of 667m and 589kg and the maximum yield was 720kg. 150 yuan or more. Chengde County by the Cheng