003490000a22001210004500060000800000082001600008100001600024245004000040260005500080260000900135300000800144650007500152  a100  a631.422 KAN  aKanwar, J S  aSoil fertility: theory and practice  aNew Delhi, Indian Council of Agricultural Research  c1976  a519  aSocial fertility/ Fertilizer management -Crop production/ Soil science