Barrios, M.B., A.A. Bozzo, S.P. Debelis, A.M. Pereyra, and A. Buján. 2006. “Soil Physical Properties and Root Activity in a Soybean Second crop/Maize Rotation under Direct Sowing and Conventional Tillage”. Spanish Journal of Agricultural Research 4 (4), 355-62. https://doi.org/10.5424/sjar/2006044-212.