00447nam a2200145Ia 4500008004100000082002100041100002300062245007500085250001200160260003800172300001000210600002400220600002400244650003300268140113s9999    xx            000 0 und d  a631.452:631.8 N9  a" Havlin, John L."  aSoil fertility and fertilizers: An introduction to nutrient management  a6th Ed.  b"New Delhi : Prentice-hall, 1999"  a497p.  a" Beaton, James D."  a" Beaton, James D."  aFertilizers ; Soil fertility