00391nam a2200121Ia 4500008004100000082002600041100002000067245004200087260003800129300001300167600001800180650007100198140224s9999    xx            000 0 und d  a631.461.74:581.143 L7  aSubba Rao, N.S.  aSoil micro organisms and plant growth  aNew DelhibOxford and IBHcc 1977  aiv,287p.  aN.S.Subba Rao  aSoil micro-organisms,Plant growth,Micro-organisms, Nitrogen-fixing