@article{07cba1f68bc7465cabb368ff44d12d8e,
title = "Effects of Al on nitrogen (NH4 and NO3) uptake, nitrate reductase activity and proton release in two sorghum cultivars differing in Al tolerance.",
keywords = "Al tolerance, net proton efflux, NH4+/NO3- preference, nitrate reductase activity (NRA), rhizosphere pH, Sorghum bicolor (L.) Moench",
author = "W.G. Keltjens and {van Ulden}, P.S.R.",
year = "1987",
language = "English",
volume = "104",
pages = "227--234",
journal = "Plant and Soil",
issn = "0032-079X",
publisher = "Springer",
}