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Keyword [soil fixed ammonium]
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1. The Study On Fixed Ammonium In Major Types Of Upland Soils And Paddy Soils In Hunan Province, China
2. Fixed Ammonium And Its Availability In Paddy Soils Of Hunan Province
3. Effect Of Combined Application N Fertilizer And Manure On Soil N Supply Capacity In Greenhouse Condition
4. Content Of Soil Fixed Ammonium And Its Influencing Factors In The Mu Us Desert
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