00261nam a2200097Ia 4500008004100000082002200041100002300063245003400086260003500120300000800155140113s9999    xx            000 0 und d  a631.1(02)   M0.32  a"Brady, N.C., ed."  aAdvances in Agronomy -vol. 32  a1980bAcademic PresscNew York  a161