The westerly situation and the granite upland areas resulted in mainly pastoral farming in most of Cornwall. A narrow belt of land along the south coast of Cornwall east of the River Fal however supported a more mixed type of agriculture. "With its mineral wealth and large fishing interests Cornwall was less absolutely dependent on its agriculture, and farming was frequently a part-time occupation and of second rank in the county." (Giles V. Harrison.) In south western counties the century following 1640 saw a development of specialisation in livestock farming which included livestock-rearing in north Devon and north Cornwall. Cornwall was less affected than other counties by developments such as changes in land tenure, crop and technical innovations and increasing commercialism. The south-western counties were progressive in the use of manures and burn beating (or devonshiring) to improve the soil of moorland, waste or fallow land. The introduction of new root crops and artificial grasses which occurred elsewhere in the late 17th century did not happen in Cornwall until the 18th century. This was for various reasons, including the county's geographical isolation and the lesser importance of agriculture in the economy. The innovations in root crops are found earliest in south-east Cornwall, e.g. at St Germans and Liskeard by 1715 and 1725 respectively.