播期对华北平原雨养夏玉米产量形成与资源利用效率的影响
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Effects of Sowing Date on Rain-Fed Summer Maize Yield Formation and Resource Utilization in North China Plain
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图2. 播期对雨养夏玉米产量的影响 |
Fig.2. Effects of sowing date on yield of rain-fed summer maize |
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