The Effect of Height of Water Table on the Growth of Holcus lanatus with Reference to Lolium perenne

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Abstract
Plants of H. lanatus L. and L. perenne L. were grown in monocultures and in 50:50 mixture in free-draining conditions and with the water table at 5,11 or 21 cm below the soil surface. The shoot dry and N content (%) of both species declined similarly with increasing height of water table, in both monocultures and mixtures. Only H. lanatus responded to the high water table by producing large numbers of nodal roots and fine surface roots which may enable it to survive better in such conditions.