中国玉米品种保护现状分析
杨扬,田红丽,易红梅,刘亚维,任洁,王蕊,王璐,赵久然,王凤格(
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Analysis of the Current Status of Protection of Maize Varieties in China
Yang YANG,HongLi TIAN,HongMei YI,YaWei LIU,Jie REN,Rui WANG,Lu WANG,JiuRan ZHAO,FengGe WANG()
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图7. 玉米品种不同品种权保护阶段的年际变化
Fig. 7. Inter-annual variations of total number of maize varieties in different PVP stages
