OverseerFM does not assume a re-grassing program is occurring on farm. This is generally OK when a small proportion of the farm is re-grassed each year because mineralization due to cultivation and subsequent accumulation of organic matter usually balance out.
If the majority of a block has been re-grassed within the last 5 years, select Cultivated in the last 5 years when information is entered for the block in the pasture input tab.
If re-grassing is occurring as part of a crop rotation this would be modelled using a crop or fodder block depending on the length of the rotation.