title: The effect of the ratio of magnesium: calcium on numbers of Rhizobium in liquid medium.
mesh_terms: D002118:Calcium / Q000494:pharmacology*; D002452:Cell Count; D003470:Culture Media; D008274:Magnesium / Q000494:pharmacology*; D012231:Rhizobium / Q000254:growth & development*
chemical_list: D003470:Culture Media; D008274:Magnesium; D002118:Calcium