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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２）水稻获得普遍高产，平均６６７米２产达５８９公斤，最高单产达７２０公斤，每６６７米２覆膜直播稻可比播秧稻增收节支１５０元以上。由承德?
National Key Scientific and Technological Project --- Research on Rice Covering Direct Seeding in Poverty Area of Northern China Achieved Success in Chengde County, Hebei Province. Last year, 2 million mu (667 m2) of rice broadcast live with this new technology was generally high yield, with an average yield of 589 kg at 667 m 2 and a maximum yield of 720 kg per 667 m 2. Support 150 yuan or more. By Chengde?