00300nam a2200109Ia 4500008004100000020001500041082002000056100002100076245003000097260003600127650002700163220204s9999    xx            000 0 und d  a0120007940  a631/635bADV.76  aSparks, Donald L 0aAdvances in agronomy V.76  aSan DiegobAcademic Pressc2002  aCrop stimulation model