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追施氮肥时期对冬小麦旗叶叶绿素荧光特性的影响
鞠正春;于振文
Effects of nitrogen topdressing at different growth stage on chlorophyll fluorescence of winter wheat flag leaves
JU Zhengchun;YU Zhenwen
应用生态学报 . 2006, (03): 395 -398 .