00261nam a2200097Ia 4500008004100000020001500041082002000056100002100076245003000097260003600127220204s9999    xx            000 0 und d  a0120007932  a631/635bADV.75  aSparks, Donald L 0aAdvances in agronomy V.75  aSan DiegobAcademic Pressc2002