title: Nitrate reductase and dehydrogenase activities of cowpea nodules as affected by ammonium sulphate and urea fertilizers.
mesh_terms: D000645:Ammonium Sulfate / Q000494:pharmacology*; D005308:Fertilizers; D009565:Nitrate Reductases / Q000378:metabolism*; D009586:Nitrogen Fixation / Q000187:drug effects; D010088:Oxidoreductases / Q000378:metabolism*; D010944:Plants / Q000378:metabolism / Q000382:microbiology*; D012231:Rhizobium / Q000187:drug effects* / Q000378:metabolism; D012988:Soil Microbiology; D014508:Urea / Q000494:pharmacology*
chemical_list: D005308:Fertilizers; D014508:Urea; D010088:Oxidoreductases; D009565:Nitrate Reductases; D000645:Ammonium Sulfate