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R. Barber | O. Diaz | M. Orellana
[1] R. Barber,et al. Effects of deep tillage on soil properties, growth and yield of soya in a compacted ustochrept in Santa Cruz, Bolivia , 1989 .
[2] H. B. Spencer,et al. A NEW HAND‐HELD RECORDING PENETROMETER FOR SOIL STUDIES , 1980 .
[3] Fernando Sanabria Fernández. Gabriel René Moreno , 1961 .