In the UK it is probably technically possible to at least double the output from grassland. However, the present emphasis is on restricting production to avoid over-supplying markets. The position may change as world population and consumption continue to increase. Rough grazing is typically in large blocks, with limited control of grazing, often on hill or mountain land, often inaccessible, usually on poor soil with an unfavourable climate, often steep, rocky or boggy, sometimes in common ownership. Common plant species include heather, bracken, Molinia and Nardus .
Sheep are usually the main livestock.
Permanent grassland is typically in fields, with adequate control of grazing and usually with better soil and climatic conditions than rough grazing. The botanical quality of permanent grassland for agricultural production can be judged on the proportion of preferred species, particularly perennial ryegrass and white clover. Permanent grassland may be used for grazing by dairy cattle, other cattle and sheep and for silage and hay. Uses are as for permanent grassland, but probably with more emphasis on silage and dairy cattle. Temporary vs permanent grassland Temporary grassland provides opportunities to sow preferred species and to keep up to date with the latest varieties.