In crop rotations, they additionally provide legacy effects for follow-on crops (fertilizer replacement value, improved soil health) and consequent reductions in GHG emissions. These benefits have direct implications for existing organic agricultural production, which becomes less dependent on slurry and reduces weed pressure in arable crops, as well as trigger the conversion of conventional agriculture to organic agriculture. GrassRotate will use an existing long term organic crop-rotation experiment to determine optimal management techniques to enhance yields, fertilizer replacement potential and forage quality of a multispecies grassland compared to a traditional grass-clover ley. Furthermore, it will for the first time closely examine the legacy effects in crop rotations and determine changes in soil organic carbon stocks in www.orgprints.org