00248nam a2200097Ia 4500008004100000082002000041100002300061245002500084260003300109300000800142140113s9999    xx            000 0 und d  a631(02)   N1.41  a"Brady, N.C., Ed."  aAdvances in Agronomy  a1991bAcademic PresscLondon  a378