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Keyword [economic coefficient]
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1. Effect Of Nitrogen Fertilizer On Yield Of YangDao6 (Conventional Indica) And Analysis Of Reasons
2. Research On Agricultural Ecosystem Succession And Farml-and Vegetation Carbon Storage Of Chengdu Plain
3. Effect Of Maize-soybean Intercropping And Reduced N Application On Crop Growth,Yield And Soil Nitrogen
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