Economic effects of long-term restrictions drainage water disposal
1990
Wichelns, D. | Howitt, R. | Horner, G. | Nelson, D.
Crop yield and acreage data from an irrigation district with historical salinity and drainage problems are compared with data from a nonimpacted production region to examine the long-term effects of restrictions on drainage water disposal. Time trend analysis indicates that the production of cotton, tomatoes, alfalfa seed, and grain crops evolved along significantly different paths in the two regions. Results support the hypothesis that salinity and high water tables motivated changes in yields and cropping patterns in the impacted district. Average yields of salt-sensitive and salt-tolerant crops improved in the years following installation of a drainage outlet in the impacted district. Estimated iprovements in total revenues, as a result of installing the drainage outlet and improving soil and water conditions, range from $37 per acre for wheat to $698 per acre for tomatoes.
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