|Author:||Grismer, M. E.|
|Book Group Author:||NA|
Water value in agriculture production may be overlooked, though it is an important factor to rational water allocations within a region. An analysis of cotton (cultivars Upland and Pima) lint yield, lint yield-consumptive use ratio (LY:ETc), water use efficiency and lint price for Arizona and California, USA, during 1988-99 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, 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 California were weakly correlated with ETc and averaged 1.33 t/ha (cv. Upland) and 1.08 t/ha (cv. Pima). Cotton lint yields in desert regions in Arizona and California were not correlated with ETc. The greatest LY:ETc ratios (1.9-2.1 kg/ha-mm) were in the San Joaquin valley of California, were similar to that from WUE type studies and resulted in gross IWVs (~3400-3800 US$/ha-m), with relatively moderate variability at a net irrigation water requirement (IWR) of approximately 720 mm. While this IWV was 2.5 times greater than water delivery prices below the California Delta, it was less than the average municipal water costs of ~4200 US$/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 was two to three times greater than that obtained for lucerne and sudangrass hay crops in all regions.
|Pages:||227 - 242|
|Journal:||Agricultural Water Management|
arid climate, arid lands, cotton, crop yield, cultivars,deserts, evapotranspiration, irrigation, irrigation water, plant waterrelations, water conservation, water costs, water management, waterrequirements, water use, water use efficiency, Arizona, California, USA,Gossypium, Malvaceae, Malvales, dicotyledons, angiosperms,Spermatophyta, plants, eukaryotes, Mountain States of USA, WesternStates of USA, USA, North America, America, Developed Countries, OECDCountries, Southwestern States of USA, Pacific States of USA, cultivatedvarieties, desert climate, United States of America, water resourcemanagement, watering, Agricultural Economics (EE110), Natural ResourceEconomics (EE115) (New March 2000), Field Crops (FF005) (New March2000), Plant Breeding and Genetics (FF020), Plant Water Relations(FF062), Plant Production (FF100), Soil Water Management (Irrigation andDrainage) (JJ800) (Revised June 2002) [formerly Soil Water Management],Water Resources (PP200), Erosion; Soil and W