00270nam a2200097Ia 4500008004100000082002100041245005200062260002300114300000900137650002600146130903s9999    xx            000 0 und d  a631.83 15/18  M8  aPotash; its need and use in modern agriculture.  aCanadabPPICc1983  a65p.  aPotassium Fertilizers