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Keyword [AvailablePhosphorus]
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1. The Response Of Crop Yield, Soil Phosphorus And Phosphorus Fractions Of Rotating System To Conservation Tillage On The Loess Plateau
2. Changes Of Soil Organic Matter And Nutrients In Three Soils Of Shandong Province Over25Years
3. Study On Influences Of Nitrogen And Phosphate Application On Yield And Environmental Effects Of Wheat-maize Rotation
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