00263nam a2200097Ia 4500008004100000082001600041100001800057245003200075260005000107300000800157140113s9999    xx            000 0 und d  a631.81   L3  a"Olson, R.A."  aFertilizer Technology & use  a1973bSoil Science Society of AmericacU.S.A.  a611