Alcântara, M.A.K. de and Camargo, O.A. de (2011) “Nitrate movement on surface and subsurface horizons of Udox and Udult soils with variable charges”, Pesquisa Agropecuaria Brasileira, 45(1), pp. 81–88. doi:10.1590/S1678-3921.pab2010.v45.1723.