00320nam a2200097Ia 4500008004100000082002900041245006500070260003000135300000900165650004800174130903s9999    xx            000 0 und d  a631.84 85.001.7(047)  M0  aImproving efficiency of nitrogen and phosphorus fertilizers.  aNew DelhibI.A.R.I.c1980  a24p.  aNitrogen Fertilizers,Phosphorus Fertilizers