J. S. Rowarth, Archie, W. J., Cookson, W. R., Hampton, J. G., Sanders, C. J., Silberstein, T. B., and Young, W. C.,
“The link between nitrogen application, concentration of nitrogen in herbage and seed quality in perennial ryegrass (Lolium perenne L.)”,
J. Appl. Seed Prod, vol. 17, pp. 1–6, 1999.
OREGON STATE UNIVERSITY
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