00295nam a2200097Ia 4500008004100000082004300041100002000084245005400104260003100158300000800189140113s9999    xx            000 0 und d  a"581.1:633""1979.4.2/5"" (082.2)   M1"  a"Johnson, C.B."  aPhysiological Process limiting plant productivity  a1981bButterworthscLondon  a395