In June 1991, a two year field study was initiated to examine if three non-turf groundcovers with reputations for using low amounts of water actually use less water than Kentucky bluegrass (KBG). Irrigation treatments were based on percentages of ET (100%, 75%, 50%, 25%, 0%) and calculated by the modified Penman equation. Results from the 1991 season indicate that at the 100% and 75% treatments Potentilla tabernaemontani and Cerastium tomentosum were significantly better than the other species in terms of establishment and vigor but quality declined significantly at rates below 75%. At the 50% rate both KBG and Sedum acre maintained good quality although growth was slow. At the 25% rate, quality of KBG significantly declined while Sedum acre maintained good quality. Quality of Sedum acre declined only slightly at the 0% treatment and would be a good alternative to KBG if water conservation was a high priority in the landscape.
Richard C. Beeson Jr
Transpiration of woody shrubs appears to increase with decreases in plant density within production beds as plants are randomly removed for sale. To assess potential impact on irrigation management, this observation was tested with market-sized plants in suspension lysimeters at specific levels of canopy closure. Canopy closure was defined as the percentage of cumulative projected two-dimensional canopy area of individual plants per unit ground area on which they were placed. In 1997, evapotranspiration (ETA) of plants in 26.6-L containers was comparable from isolated plants up to 67% canopy closure. At full canopy closure (100%), ETA was 40% less than 67% closure or lower. When repeated in 2003, results were similar for similar-sized plants and for two sizes smaller (11.4- and 3.8-L containers). ETA response to canopy closure was independent of height from 0.5 to 1.5 m tall. At full canopy closure, whole plant transpiration was equivalent to that measured from only the upper 40% (by height) of the canopy under full sun. This was independent of plant size. Implications for water conservation during production and plants’ irrigation needs in landscapes are discussed.
Brian H. Hurd, Rolston St. Hilaire, and John M. White
participants and water conservation staff from the cities of Albuquerque, Santa Fe, and Las Cruces, N.M.
Aaron L. Warsaw, R. Thomas Fernandez, Bert M. Cregg, and Jeffrey A. Andresen
application. The objectives were to: 1) determine the effect of scheduling irrigation according to DWU on water conservation and plant growth; 2) determine DWU and water use efficiency (WUE) of several types of common container-grown woody ornamentals and
Roger Kjelgren, Larry Rupp, and Doug Kilgren
Cathy Myers-Roche and Roger Kjelgren
Interdisciplinary graduate degrees are becoming increasingly popular, filling both employer needs as well as student goals. The Plants and Soils Department at Utah State University offers an interdisciplinary master of professional studies in horticulture (MPSH) degree program specializing in urban landscape water conservation. The MPSH is a one calendar year degree consisting of a small group cohort with a strong emphasis on communication and policy development geared toward creating and managing water conservation programs. Core to this model is what personality type is drawn to an MPSH degree compared to the traditional, research-based master of science degree. We are comparing the personality types of 16 students in the MPSH to 15 students in, or having completed, the traditional MS degree program by using the Myers-Briggs test (MBTI), Strong Interest Inventory (SII) test, and key informant surveys. Basic MBTI personality categories in extroversion/introversion, sensing/intuition, thinking/feeling and judging/perceiving are being evaluated by comparison in contrast as well as consistency across the two degree types. Key informant surveys quizzed individual preference regarding the two degrees. Preliminary inspection of survey, MBTI and SII results indicate a definite link between type of graduate program and basic personality trait. Students in or having completed the traditional MS degree program that indicated a preference for the MPSH degree shared the same personality types as those in the MSPH program. These preliminary results suggest that an interdisciplinary professional degree in horticulture focused on a particular topic can appeal to horticultural undergraduates that might not otherwise consider a graduate degree.
John E. Erickson and Kevin E. Kenworthy
efficiency with which that water is used to produce turf biomass may also contribute to improved water conservation. Water use efficiency is a measure of carbon assimilated per unit of water transpired by the plant ( Stanhill, 1986 ) and can be measured
Jared. A. Hoyle, Gerald M. Henry, Travis Williams, Aaron Holbrook, Tyler Cooper, Leslie L. Beck, and Andrew J. Hephner
Water conservation efforts have recently intensified in the arid Southwest as a result of increases in urbanization and local drought conditions, which have resulted in reduced amounts of water available for irrigating turfgrass ( Ervin and Koski
Layla J. Dunlap, Jeremiah R. Pinto, and Anthony S. Davis
Throughout the restoration industry seedling growers are making more environmentally conscious decisions, particularly with regard to water conservation practices ( Dennis et al., 2010 ). As water conservation measures and wastewater runoff issues
Laura A. Warner, Amanda D. Ali, and Anil Kumar Chaudhary
.g., providing shelter and food for animals) they are most likely to engage in water conservation behaviors. Therefore, extension can help promote irrigation best practices by targeting people who are interested in pollinators, birds, and other animals. An