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Keyword [Biological validity]
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1. Relation Between The Soil Microbial Characteristic And Biological Availability Of Nitrogen For Tobacco, Nicotiana Tabacum L. K326
2. Dynamic Characteristic Of Biological Validity Of Cd In Soil-Rice System
3. Effects Of Different Measures Of Controlling Water And Fertilizer Supply On Biological Validity And Movement Of Deep Soil Nitrate
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