- Biblio
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J. S. Rowarth, Boelt, B., Hampton, J. G., Marshall, A. H., Rolston, M. P., Sicard, G., Silberstein, T. B., Sedcole, J. R., and Young, W. C.,
“The relationship between applied nitrogen, nitrogen concentration in herbage and seed yield in perennial ryegrass (Lolium perenne L.). I. Cv. Grasslands Nui at five sites around the globe”, 1998.