Land aplication of wastewater in Brazil: a scientific challenge: chemical characterization of soil at Populina, São Paulo State - Rosolen, Vania; Herpin, Uwe; Frãnzle, Stefan; Breulmann, Gerhard; Camargo, Plinio Barbosa de; Paganini, Wanderley da Silva; Cerri, Carlos Clemente; Melfi, Adolpho José; Markert, Bernd (Journal of Soils and Sediments, 2005)