As clover is susceptible to PastorTrio and Envy and other systemic herbicides that kill broad-leaved weeds, a growing number of farmers are now excluding clover from the original mixture. They then apply a post-emergent herbicide and over-sow the clover into a clean sward.
The technique, pioneered by Dr James Humphreys of Teagasc Moorepark, involves mixing the clover at 5kg/ha with PK fertiliser and spreading at 2.5 bags/ha in two runs at right angles to each other.
The use of a quad bike fitted with a slug pellet applicator can also be an effective method of broadcasting the clover seed.
Around 3,000 gallons/acre of fairly watery slurry should be applied after broadcasting the clover seed. This will help to wash in the seed and seal the ground thereby lowering moisture loss.