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- [6] Sulphate deprivation depresses the transport of nitrogen to the xylem and the hydraulic conductivity of barley ( Hordeum vulgare L.) roots[J] . Jadu Lal Karmoker,David T. Clarkson,Leslie R. Saker,Joy M. Rooney,Judith V. Purves.Planta . 1991 (2)