@article{Thomas:284508,
      recid = {284508},
      author = {Thomas, Howard R. and Brown, William G.},
      title = {A PROPOSED LAND QUALITY VARIABLE FOR INCLUSION IN  AGGREGATE PRODUCTION FUNCTION ANALYSIS},
      address = {1974-08},
      number = {2180-2019-1046},
      pages = {14},
      year = {1974},
      abstract = {The study upon which the land quality variable is based  was initiated as a result of the authors' work in  developing data for the Economic Research Service's Land  Inventory and Productivity System (LIPS). A search of the  literature revealed a void in published data concerning the  productive relationship of water, fertilizer, and other  inputs, to land as a companion resource for the production  of agricultural goods. The LIPS data presented an  opportunity to estimate production relationships which  incorporate certain physical characteristics of the land  resource to aid in the identification of the relationship  of water and fertilizer to yield.},
      url = {http://ageconsearch.umn.edu/record/284508},
      doi = {https://doi.org/10.22004/ag.econ.284508},
}