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Some effects of nitrate and ammonium nitrogen on the mineral composition of pasture grasses : submitted as part fulfilment of the requirements for the degree of M. Agr. Sc. in Soil Science
(Massey University, 1966)
Nitrogen is unique among the major plant nutrients derived from soils in that it may be taken up by plants either as an anion or cation. Nitrate and ammonium comprise the pool of assimilable nitrogen, but their proportionate ...