The Dynham Survey of 1566 records the existance of four granary mills on the Dynham manor alone, while there were at least two other corn mills elsewhere in the parish. Sea-sand, manure and the practise of 'Denshiring' were used in other parts of Devon during this period to improve the quality of arable land, but there is no apparent evidence for their use on Hartland's fields at this time. Numerous references to lime being brought into the parish from Clovelly Quay also appear in the church accounts after 1591. Sand was also a commodity from the rocky coast although the market fair was usally a Spring and Autumn occasion. The latter shows that barton and customary tenants of the Dynham manor were farming 3,581 acres of land, of which 3,115¼ acres were classed as arable, 93 acres were meadowland and 378¾ acres were moorland. The convertible husbandry was a rule, for in Devon, tillage and ploughing in the seventeenth century onward, crops followed one another on the same ground for a perennial cycle and water would hold land for grazing cattle toward the upland areas of the parish to a left over moordland.
The Dynhams were also responsible for the foundation of the borough of Harton circa 1290. Harton is now scarcely more than a large village, but it once supported a larger population than the neighbouring town of Bideford. A second grant, dated 1559, replaced them with a Saturday market and two annual fairs. Testimonies of the market or records to ensure fair trade, list twenty-seven sales of livestock that were transacted in the market between 1615 and 1621. The Devon farmers who made such transactions came from Hartland itself (34 men), Bradworthy (4 men), Clovelly (2 men), and West Putford, Buckland Brewer, Bideford, Sutcombe and Woolfardisworthy (one each). At least 5 other farmers travelled to Harton market from across the Cornish border: 3 from Morwenstowe and 2 from Kilkhampton. Carew in 1602 referred to graziers from Devon and Somerset who fed "yearly great droves of cattle in the north quarter of Cornwall. Hartland Church Seating 1613
The strong presence of pastoral farming within the parish is also indicated on the only Hartland estate map to survive from this period. This map of the hamlet of Stoke and its surrounding fields, almost certainly dating from the 1590s [40], shows that at least some of these fields were used as pasture. One field of 89 acres was called 'Sheepjays', while three smaller fields were called West Horse Park (4 acres), Middle Horse Park (3 acres), and East Horse Park (3 acres). The records of fair trading in the Portreeve Accounts indicate that 53 sheep, 17 lambs, 1 ram, 12 horses, 10 pigs, 3 heifers, 1 steer, 3 yearlings, 15 kyne, 10 cows and 9 oxen were sold in Harton market between 1615 and 1621. Occasional references to livestock sold appear in the church accounts to sheep being left to Hartland Church by individuals in their wills: two men in 1601, for instance, left one sheep each to the church .