Regional cotton lint yield,ETc and water value in Arizona and California |
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| Institution: | 1. University of Diyala, College of Agriculture, Soil Science and Water Resources Department, Diyala, Iraq;2. TU Dresden, Professur Agrarsystemtechnik, Bergstraße 120, 01069 Dresden, Germany;1. Department of Mathematics, Faculty of Fundamental Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan;2. Department of Mathematics, School of Arts and Sciences, Tokyo Woman''s Christian University, 2-6-1 Zempukuji, Suginami-ku, Tokyo 167-8585, Japan;1. MASSACHUSETTS GENERAL HOSPITAL;1. University of Chicago Computation Institute, 5735 S. Ellis Avenue, Chicago, IL 60637, USA;2. Argonne National Laboratory Math & Comp. Science Division, Argonne, IL 60439, USA;3. Columbia University Center for Climate Systems Research, 2880 Broadway, NY, NY 10025, USA;4. University of Chicago Department of Geophysical Sciences, 5734 S. Ellis Avenue, Chicago, IL 60637, USA;5. New Zealand Landcare Research, 231 Morrin Road, St Johns, Auckland 1072, New Zealand;6. Department of Computer Science, University of Chicago, Chicago, IL 60637, USA;1. Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling 712100, China;2. College of Agricultural Equipment Engineering, Henan University of Science and Technology, Henan, Luoyang, 471000, China |
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| Abstract: | Water value as agriculture production may be overlooked, though it is an important factor to rational water allocations within a region. An analysis of cotton (Upland and Pima) lint yield, lint yield-consumptive use ratio (LY:ETc), water-use efficiency (WUE) and lint price for Arizona (AZ) and California (CA) during 1988–1999 is considered as part of an attempt to determine lint water value, or benefit. It included determination of means and variability of cotton lint production, LY:ETc ratios and associated irrigation water values (IWVs) and compared these numbers with published estimates of WUE, forage hay water values and municipal water costs. Available rainfall, reference evapotranspiration (ETo), lint yields and price data for counties in both states were used. Consumptive use was estimated using a four-stage crop coefficient function verified by literature values or County Advisor experience. As with dry matter production, cotton lint yields in interior valley regions of CA were weakly correlated with ETc and averaged 1.33 Mg/ha (Upland) and 1.08 Mg/ha (Pima). Cotton lint yields in desert regions of AZ and CA were not correlated with ETc. The greatest LY:ETc ratios (1.9–2.1 kg/ha-mm) were in the San Joaquin valley of CA, were similar to that from WUE type studies and resulted in gross IWVs (∼3400–3800 US$/ha-m), with relatively moderate variability at a net irrigation water requirement (IWR) of approximately 720 mm. While this IWV is 2.5 times greater than water delivery prices below the California Delta, it is less than average municipal water costs of ∼4200 US$/ha-m for Los Angeles, San Francisco and Pheonix while the overall AZ/CA average cotton lint IWV is considerably less. However, cotton lint IWV is two to three times greater than that obtained for alfalfa and sudangrass hay crops in all regions. |
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