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1978、1979年在北京农校农场进行玉米播种试验.以京早7号为材料进行单作夏播和春播.1978年6月下旬播种、10月4日收获,全生育期追施硫铵70斤/亩,每亩实收3910株,亩产712.9斤.1979年5月上旬播种、8月16日收获、全生育期追施硫铵120斤/亩,每亩实收3706株,亩产971.6斤.
Maize sowing experiment was conducted in Beijing Agricultural School Farm in 1978 and 1979. The maize was planted in summer seeding and spring sowing in Beijing on the morning of July 7. The sown crop was in late June 1978 and the harvest on October 4, Kg per acre, 3910 acre per acre, 712.9 kg per mu. May 1979 sowing, harvest August 16, the entire growing period of ammonium sulphate 120 kg / mu, 3706 acre per plant, mu 971.6 pounds.