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A. D. Bradshaw, M. J. Chadwick, D. Jowett, R. W. Snaydon, Experimental Investigations into the Mineral Nutrition of Several Grass Species: IV. Nitrogen Level, Journal of Ecology, Vol. 52, No. 3 (Nov., 1964), pp. 665-676
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Bradshaw et al. (1964) studied this question.
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