Clayton L. Hanson, Gilbert A. Schumaker, Carl J. Erickson, Influence of Fertilization and Supplemental Runoff Water on Production and Nitrogen Content of Western Wheatgrass and Smooth Brome, Journal of Range Management, Vol. 29, No. 5 (Sep., 1976), pp. 406-409
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Hanson et al. (1976) studied this question.
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