<P> According to a report by the United Nations' Food and Agriculture Organisation, land degradation has been exacerbated where there has been an absence of any land use planning, or of its orderly execution, or the existence of financial or legal incentives that have led to the wrong land use decisions, or one - sided central planning leading to over-utilization of the land resources - for instance for immediate production at all costs . As a consequence the result has often been misery for large segments of the local population and destruction of valuable ecosystems . Such narrow approaches should be replaced by a technique for the planning and management of land resources that is integrated and holistic and where land users are central . This will ensure the long - term quality of the land for human use, the prevention or resolution of social conflicts related to land use, and the conservation of ecosystems of high biodiversity value . </P> <P> The urban growth boundary is one form of land - use regulation . For example, Portland, Oregon is required to have an urban growth boundary which contains at least 20,000 acres (81 km) of vacant land . Additionally, Oregon restricts the development of farmland . The regulations are controversial, but an economic analysis concluded that farmland appreciated similarly to the other land . </P>

Give three reasons to explain why it is necessary to know the land use pattern of a country