我县夏玉米生产曾出现过三次突破,一是1975年随麦田套种玉米面积的扩大,广泛应用杂交种,全县37.51万亩夏玉米,平均单产641斤;二是1979年改进与麦田套种的相适应的栽培技术,全县38.69万亩夏玉米,平均单产775斤;三是1980年以来,广泛推广紧凑型良种及逐步趋向指标化的栽培措施,1983年全县34万亩夏玉米,平均单产812斤,其中1,188.3亩,平均亩产1,362.1斤。其指标及措施如下: There were three breakthroughs in summer maize production in our county. First, in 1975, with the expansion of maize interplanted area in wheat fields, hybrid varieties were widely used. The average daily output of 375,100 mu of summer maize was 641 kg. Second, Third, since 1980, the widespread promotion of compact varieties and gradual trend of the indexed cultivation measures, in 1983 the county 340,000 acres of summer corn, the average Yield 812 pounds, of which 1,188.3 acres, an average yield of 1,362.1 kg. Its indicators and measures are as follows: