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近年来，昌黎县科技局、农林局，通过调查总结出一套上茬小麦、下茬玉米高产栽培经验。目标产量：小麦６６７ｍ２（亩）产４００ｋｇ（公斤），高产５００～５５０ｋｇ；玉米６６７ｍ２产５００ｋｇ，高产６００ｋｇ以上，两茬共产粮食９００～１１５０ｋｇ，６６７ｍ２产值１?
In recent years, Changli County Bureau of Science and Technology, Agriculture and Forestry Bureau, concluded through the investigation of a crop of wheat, the next crop of high-yield corn cultivation experience. Target production: Wheat 667m2 (mu) produce 400kg (kg), high yield 500 ~ 550kg; corn 667m2 produce 500kg, high yield more than 600kg, two crop of common grain 900 ~ 1150kg, 667m2 output value 1?