Bent grass grows very slowly over winter and early spring producing little feed for stock.  Ryegrass and clover are less competitive than bent grass. Soils with low fertility and high acidity (low pH) suit bent grass. To eradicate you need to aim for Olen Phosphorus (P) above 15mg/kg, Colwell Potassium (K) above 250mg/kg, CPC Sulphur (S) above 10mg/kg and pH (Water) above 5.4. Bent grass survives in waterlogged soils better than ryegrass and clover.  Light grazing during spring and summer allow bent grass surplus to accumulate which chokes out clover and ryegrass in autumn. It is recommended that pastures be grazed evenly and then spelled adequately to ensure that bent grass is eaten and ryegrass and cocksfoot have time to recover and shade out bent grass. Applying fertilizer/lime plus grazing at the correct heights will encourage ryegrass and clover plant in bent grass pastures. A soil test can determine if you need to apply lime or fertilizer.  Soil test kits are available from fertilizer companies.  Low rates of glyphosate applied during late October to late November suppress the formation of seed heads in bent grass. With follow up rains, bent grass remains leafy and provides good quality feed which is attractive to stock. Graze 7 days after application. Continue grazing the bent grass in rotation.  Spray to kill and re-sow.  Bareout, spray, after spraying apply lime to acid soils before cultivation. Cultivate the bent grass up into small pieces in the first pass. Leave fallow or sow a fodder crop. Remove weeds and sow to new pasture. Graze new pasture and apply fertilizer regularly.