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Chaffey, N and Deane-Drummond, C.E (1985) 'Characteristics of nitrate uptake into seedlings of pea (Pisum sativum L. cv. Feltham First): changes in net NO3 uptake following inoculation with rhizobium, and growth in low nitrate concentrations.' Plant, Cell and Environment, 8 (7). pp. 517-523.