00257nam a2200097Ia 4500008004100000082002000041100002300061245003400084260003300118300000800151140113s9999    xx            000 0 und d  a631(05)   L9.31  a"Brad, N.C., N.C."  aAdvances in Agronomy -Vol. 31  a1979bAcademic PresscLondon  a315