优化施肥下长江流域冬小麦产量及肥料增产效应
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Effects of Yield and Fertilization on Yield Increase of Winter Wheat in Yangtze Valley Under Optimized Fertilization
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图4. 长江流域各省(市)冬小麦氮、磷、钾肥农学效率 |
Fig. 4. Comparison of agronomic efficiency to N, P and K fertilizer application among provinces in Yangtze Valley |
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