Abstract
Four grasses, ‘Grasslands Matua’ prairie grass (Bromus catharticus Vahl), ‘Grasslands K1858’ cocksfoot (Dactylis glomerata L.), ‘Aberystwyth S23’ ryegrass (Lolium perenne L.) and ‘Grasslands Kahu’ timothy (Phleum pratense L.) were grown on a medium-heavy soil, cut monthly to 2.5 or 5.0 cm, and fertilised monthly with nitrogen. Matua produced to 13 200 kg/ha DM, cocksfoot to 11 450 kg/ha, S23 to 8600 kg/ha, and Kahu to 10 600 kg/ha. Least variation between species in seasonal yields was shown in spring. Kahu gave high yield in spring (5900 kg/ha) when rainfall was high. Matua gave highest yields in summer (to 2950 kg/ha) and S23 lowest (to 780 kg/ha). In autumn, K1858 and Matua gave highest yields (to 340 kg/ha). In winter Matua was highest yielding (to 1950 kg/ha) and S23 lowest yielding (to 490 kg/ha).

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