title: Nitrogen transformations in soils. 3. In calcareous soil under barley and cow-bean in a two year's rotation.
mesh_terms: D001711:Biotransformation; D002118:Calcium; D002523:Edible Grain; D009584:Nitrogen / Q000032:analysis*; D009586:Nitrogen Fixation; D012987:Soil / Q000032:analysis*; D013025:Glycine max; D013997:Time Factors
chemical_list: D012987:Soil; D009584:Nitrogen; D002118:Calcium