Varying evapotranspiration and salinity level of irrigation waterinfluence soil quality and performance of perennial ryegrass (Lolium perenne L.)

《Varying evapotranspiration and salinity level of irrigation waterinfluence soil quality and performance of perennial ryegrass (Lolium perenne L.)》

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关键字: SOURCE SPRINKLER SYSTEM; COOL-SEASON TURFGRASSES; TALL FESCUE; WATER; TOLERANCE; DROUGHT; STRESS; GROWTH

作者单位: [Schiavon, M.; Pedroza, A.; Baird, J. H.] Univ Calif Riverside, Dept Bot & Plant Sci, Riverside, CA 92521 USA. [Leinauer, B.] New Mexico State Univ, Extens Plant Sci, Las Cruces, NM 88003 USA. [Suarez, D. L.] USDA ARS, US Salin Lab, 4500 Glenwood Dr, Riverside, CA 92501 USA. Schiavon, M (reprint author), Univ Calif Riverside, Dept Bot & Plant Sci, Riverside, CA 92521 USA. E-Mail: marcos@ucr.edu

摘要: Increasing use of recycled water that is often high in salinity warrants further examination of irrigation practices for turfgrass health and salinity management. A study was conducted during 2011-2012 in Riverside, CA to evaluate the response of perennial ryegrass (Lolium perenne L.) 'SR 4550' turf to varying quality and quantity of irrigation water. A modified line-source sprinkler irrigation system provided a salinity gradient (ECw similar to 0.6-4.2 dS m(-1)) in between lines. Irrigation was scheduled in four separate irrigation zones perpendicular to the irrigation lines according to 80, 100, 120, and 140% ETo. Changes in turf quality (R-2 = 0.30***), were primarily driven by the number of days that the area had been irrigated with saline water. When data were separated by irrigation amount, both time and water quality accounted for 54% and 46% of the variability (p < 0.001) in quality and cover, respectively at 80% ETo. A model was created to quantify decline in turf quality in relationship to %ET0 replacement and salinity accumulation in the rootzone (R-2 = 0.57). Our results suggest that perennial ryegrass requires irrigation scheduling at 140% ET0, irrigation water quality below ECw similar to 1.7 dS m(-1), and ECe below 3.8 dS m(-1) to maintain acceptable quality for 442 d in Riverside, CA. (C) 2017 Elsevier GmbH. All rights reserved.