As the population expanded, some of these settlements were sub-divided to create new hamlets and more marginal land was settled, with temporary sheilings becoming permanent settlements.
However marginal land holding and lack of proper irrigation facilities with heavy dependency on rain water for farming often causes great hardship for the farmers.
Does that include only acres certified organic and excluding all ranch land, forests and marginal land used for grazing which doesn't contain synthetic chemicals?
The 1950s also saw the start of aerial photography to discover and record ancient sites, as more intensive agriculture, forestry and gravel extraction threatened historic remains on marginal land.