00263nam a2200097Ia 4500008004100000020001800041082002100059100001600080245003900096260003000135220204s9999    xx            000 0 und d  a9780123942784  a631/635bADV.117  aSparks, D L 0aAdvances in agronomy, V. 117, 2012  aElsevierbAmsterdamc2012