... Biota in Sustainable Farming Systems, Adelaide, Australia, March 15 18 , 19 94, 19 7–203.Brussaard, L. and Kooistra, M. J., Eds., 19 93. Editors’ introduction, in Soil Struc-ture /Soil Biota Interrelationships,” ... L., 19 94. The ecology of soil organisms in reduced input farming, in Soil Biota Management in Sustainable Farming Systems, Pankhurst, C. A., Ed., Proc.Int. Workshop on Management of the Soil ... (Leb-bink et al., 19 94). Average tuber yields of potato in the years 19 88 19 91 werevirtually the same: 57 ± 7 Mg · ha 1 · yr 1 in CONVB and 58 ± 7 Mg · ha 1 ·yr 1 in INTA (Lebbink...