00351nam a22001337a 4500003000400000082001700004100001900021245009300040260003200133300000900165502001500174650001700189650001100206OSt  a631.41bS48S  aSingh, Dwarika  aStudies on Ammonium Fixation in the Soil Associations of White Sugar Belt of North Bihar  aPusa, SamastipurbRAUc1979  a95P.  bMsc.d1979  aSoil Science  aThesis