Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6461803 | Urban Forestry & Urban Greening | 2017 | 7 Pages |
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 â¼0.6-4.2Â dSÂ mâ1) 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 (R2Â =Â 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 (PÂ <Â 0.001) in quality and cover, respectively at 80% ETo. A model was created to quantify decline in turf quality in relationship to %ETo replacement and salinity accumulation in the rootzone (R2Â =Â 0.57). Our results suggest that perennial ryegrass requires irrigation scheduling at 140% ETo, irrigation water quality below ECw â¼1.7Â dSÂ mâ1, and ECe below 3.8Â dSÂ mâ1 to maintain acceptable quality for 442 d in Riverside, CA.