@article{Walden:329901,
      recid = {329901},
      author = {Walden, Deborah},
      title = {The Cropland Availability Component of the NIRAP System:   Proposed Revisions},
      address = {1978-08},
      number = {1479-2023-008},
      series = {NRED Working Paper No. 61},
      pages = {38},
      year = {1978},
      abstract = {Excerpts from the Introduction:  The Cropland Availability  Component of the National Interregional Agricultural  Projections (NIRAP) system projects changes in the cropland  base.  Additions to cropland include conversion of pasture  and range and forest land, including development of  irrigated cropland, while losses of cropland include urban  expansion, highway construction, airport construction,  reservoir development, surface mining, recreation and  wildlife reserves, vacation home developments, and loss of  irrigated cropland.  A critical review of the component by  this author identified two major types of revisions needed.   The more important was and still is the inclusion of  economic variables in the component.  The variables would  explain cropland increases and decreases by the economic  conditions both on and off the farm.  To do this a model of  farm level decisions would be used and would likely include  opportunity costs of cropland.  Ultimately the revision  would link the Cropland Availability Component with the  Land Use Component of NIRAP.  Even though some work has  been done on the linkage this revision is viewed as long  range.  A more immediate revision involved improvement of  some of the sections of the present component.  This  revision was essentially one of updating the land data base  with information from research and surveys completed and  data made available since 1969 the most recent year of the  data in the component prior to revision.  This working  paper is the product of that activity.  This working paper  is a replacement for some of the documentation of the  component:  it includes a new section on the calculation of  the cropland base, a section on increase in non-irrigated  cropland, and one on the cropland reduction resulting from  urbanization section.},
      url = {http://ageconsearch.umn.edu/record/329901},
      doi = {https://doi.org/10.22004/ag.econ.329901},
}