00306nam a2200121Ia 4500008004100000082002100041100002000062245002500082260003000107300002000137600001400157650001300171140224s9999    xx            000 0 und d  a631(047.1) N0.43  aBrady, N.C. ed.  aAdvances in agronomy  aSan DiegobAcademicc1990  av.43(vii,373p.)  aN.C.Brady  aAgronomy