00338nam a2200121Ia 4500008004100000082002100041100002500062245002500087260004700112300001500159600002900174650001300203140224s9999    xx            000 0 und d  a631(047.1) P6.90  aSparks, Donald L.,ed  aAdvances in agronomy  aAmsterdambElsevier / Academic Pressc2006  av.90,307p.  aEdited  Donald L. Sparks  aAgronomy