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1992年黑龙江省农科院育种所从吉林省农科院引进晚熟高产玉米新品种吉单159、吉单156;山东省农科院的掖单4号玉米品种,当年在试验地进行引进品种比较试验,参加试验的还有已在黑龙江省大面积种植的丹玉13和中单2号(对照)。试验
In 1992, Heilongjiang Provincial Academy of Agricultural Sciences introduced the late-maturing and high-yielding maize varieties Jidan 159 and Jidan 156 from Jilin Provincial Academy of Agricultural Sciences; compared with the introduced varieties of Yedan No.4 in Shandong Academy of Agricultural Sciences Tests, to participate in the experiment also have been planted in large areas in Heilongjiang Province Dan Yu 13 and Zhongdan 2 (control). test