00281nam a2200097Ia 4500008004100000082001500041100004000056245004700096260003200143300000800175140113s9999    xx            000 0 und d  a631.8   L0  a"Tisdale,Samuel.L. and Nelson,W.L."  aSoil fertility and Fertilizers 2nd edition  a1970bMacMillan Co.cLondon  a694