Nitrate-Nitrogen Concentrations in the Perched Ground Water under Seepage-Irrigated Potato Cropping Systems.Published in:Journal of Environmental Quality, 2008, v. 37, n. 2, p. 387, doi. 10.2134/jeq2006.0545By:Munoz-Arboleda, F.;Mylavarapu, R.;Hutchinson, C.;Portier, K.Publication type:Article