Abstract
Growth patterns were determined for ‘Grasslands Ruanui’ ryegrass, ‘Smiths’ ryegrass ( a local ecotype), ‘Medea’ ryegrass, and ‘Grasslands Apanui’ cocksfoot grown on a medium-heavy soil under monthly cutting to 2.5 or 5.0 cm and monthly application of nitrogen. Ruanui and ‘Smiths’ ryegrass gave higher annual dry herbage yields than Apanui cocksfoot and ‘Medea’ ryegrass. In dry summers cocksfoot gave a higher yield than the ryegrass; in other seasons Ruanui and ‘Smiths’ ryegrasses were higher-yielding than Apanui cocksfoot. ‘Medea’ ryegrass was summer dormant, but gave good autumn and winter growth.

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