Background information and definitions
Rotovators are machines that have a series of blades that rotate to pierce and disturb soil. Using them disturbs soil and thus may help to control grass species while creating areas of bare ground that may be colonised by shrubland plants.
Supporting evidence from individual studies
A replicated, controlled study in 1996–1998 in a heathland invaded by wavy hair-grass Deschampsia flexuosa in Breckland, UK (1) found that rotovating did not decrease the presence of wavy-hair grass or increase the presence of heather Calluna vulgaris relative to mowing or cutting turf. After two years, wavy hair-grass presence in plots that had been rotovated (99% of plots) was not significantly different to presence in mown plots (100% of plots) or plots where turf had been cut (98% of plots). After two years, heather presence did not differ significantly between plots that had been rotovated (10% of plots) and those that had been mown (5% of plots) or where turf was cut (24% of plots). In August 1996 a number of 0.5 ha areas were rotovated, grass was cut to a height of 10 cm or less in a number of 1-2 ha blocks, and in five 4 m2 areas turf and soil were removed to a depth of 10 cm. Five 4 m2 plots were established in each of the areas subject to different interventions. Each plot was divided into a grid of 20 cm x 20 cm squares and presence of species was recorded in each square twice a year in 1996–1998.Study and other actions tested