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Two cultivars of each of two contrasting grass species, timothy (Phleum pratense L.) and perennial ryegrass (Lolium perenne L.), sown either in May or July, were sampled for dry matter (DM) weight of roots and herbage in late October (end of main growing season) and examined for regrowth when exposed to a frost treatment (−8 to −10°C in darkness for 48 h) in late January, early March and late April...
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