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豫玉１８号杂交制种技术要点王懿波王振华王永普张新（河南省农业科学院粮食作物研究所，郑州４５０００２）１隔离空间隔离：要求与其它玉米田相距３００ｍ以上；时间隔离：春播制种田播期应与其它玉米田播期错开４０天，夏播错开３０天以上。２父母本行比由于父本花粉量...
Key Techniques of Hybrid Seed Production of Yuyu 18 WANG Yi-bo WANG Zhen-hua WANG Yong-pu ZHANG Xin (Institute of Food Crops, Henan Academy of Agricultural Sciences, Zhengzhou 450002) 1 Isolation space isolation: more than 300 m away from other maize fields. Time isolation: sowing date And other corn sowed staggered 40 days, summer sow stagger more than 30 days. 2 parental line due to the male pollen amount ...