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胶南县地处沿海丘陵地带,汛期早,高温季节短,过去夏玉米面积小,产量低。1976年以来,试验推广了麦田分期套种玉米,促进了玉米增产。1979年玉米面积24.8万亩,套种23万亩,亩产718斤;1980年30万亩夏玉米,全部套种,亩产869.7斤。分期套种玉米满足了中、晚熟玉米品种对积温、光照、水分的要求,可解决夏直播玉米“堵门涝”和后期“青枯”问题,从而保证玉米正常成熟。同时,分期套种玉米早收获、早倒茬、早整地,为适时种麦创造了条件,促进小麦增产,全年丰收。
Jiaonan County is located in the coastal hills, flood season early, high temperature season is short, the past summer corn area is small, low yield. Since 1976, experiments have promoted the intercropping of maize in wheat fields and promoted the increase of corn production. In 1979, the area of corn was 248,000 mu, covering 230,000 mu and 718 kg per mu. In 1980, 300,000 mu of summer maize were planted, with 869.7 kg of mu per mu. Staged intercropping of corn to meet the late maturing varieties of corn on the temperature, light, water requirements, to solve the summer live sowing “plug waterlogging” and the late “brown” problem, so as to ensure the normal maturity of corn. At the same time, staging intercropping of corn early harvesting, early stubble, early preparation for the timely creation of wheat seed conditions, and promote wheat yield, annual harvest.