information:classification
The end of the open-field system

Seeking better financial returns, landowners looked for more efficient farming techniques. They saw enclosure as a way to improve efficiency, however it was not simply the fencing of existing holdings; there was also a fundamental change in agricultural practice. One of the most important innovations was the development of the Norfolk four-course system, which greatly increased crop and livestock yields by improving soil fertility and reducing fallow periods. Wheat was grown in the first year, turnips in the second, followed by barley, with clover and ryegrass in the third. The clover and ryegrass were grazed or cut for feed in the fourth year. The turnips were used for feeding cattle and sheep in the winter. The practice of growing a series of dissimilar types of crops in the same area in sequential seasons helped to restore plant nutrients and reduce the build-up of pathogens and pests. The system also improves soil structure and fertility by alternating deep-rooted and shallow-rooted plants. For example, turnips can recover nutrients from deep under the soil. Planting crops such as turnips and clover was not realistic under the open field system because the unrestricted access to the field meant that other villagers' livestock would graze on the turnips. Another important feature of the Norfolk system was that it used labour at times when demand was not at peak levels.

From as early as the 12th century, some open fields in Britain were being enclosed into individually owned fields. After the Statute of Merton in 1235 manorial lords were able to reorganize strips of land such that they were brought together in one contiguous block.

Copyholders had a "customary tenancy" on their piece of land that was legally enforceable. The problem was that a "copyhold tenancy" was only valid for the holder's life. The heir would not have the right to inheritance although usually by custom, in exchange for a fee (known as a fine), the heir could have the copyhold transferred. To remove their customary rights, the landlords converted the copyhold into a leasehold tenancy. Leasehold removed the customary rights but the advantage to the tenant was that the land could be inherited.

There was a significant rise in enclosure during the Tudor period. Enclosure was quite often undertaken unilaterally by the landowner, sometimes illegally. The widespread eviction of people from their lands resulted in the collapse of the open field system in those areas. The deprivations of the displaced workers has been seen by historians as a cause of subsequent social unrest.