00337nam a2200121Ia 4500008004100000082001400041100002500055245003300080260003600113300001500149600002900164650002200193140224s9999    xx            000 0 und d  a631 P4.81  aSparks, Donald L.,ed  aAdvances in agronomy vol. 81  aAmsterdambAcademic Pressc2004  av81, 267p.  aEdited  Donald L. Sparks  aAdvances,Agronomy