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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
(New Zealand Seed Technology Institute on behalf of the International Herbage Seed Group, 1998)
Potential environmental problems following the use of applied nitrogen (N) in cropping have resulted in research on indicators which attempt to ensure that the amount of N applied matches the specific requirements for the ...