What height should I cut at?

It is advisable to set the mower to leave at least 7-8 cm (3 inches) of stubble. Although cutting lower would increase the yield, the extra material is of poor nutritive value and there is a greater risk of soil contamination. Cutting too low also delays regrowth as it removes the tiller and leaf buds and may even kill some plants. If swaths are to be ‘rowed up’ a longer stubble will help to avoid soil contamination problems without reducing dry matter yields for the season as soil moisture will be better conserved and regrowth will be faster.§