003110000a22001210004500060000800000082001600008100001700024245004100041260005500082260000900137300000800146650003500154  a100  a631.422 KAN  aKanwar, J.S.  aSoil fertility : theory and practies  aNew Delhi, Indian Council of Agricultural Research  c1976  a533  aSoil fetility/ plant nutrients