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Articles 1 - 6 of 6
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Evaluating A Line Source Irrigation System For Determining Water Requirements Of Herbaceous Perennials, Roger Kjelgren, Teresa Cerny-Koenig
Evaluating A Line Source Irrigation System For Determining Water Requirements Of Herbaceous Perennials, Roger Kjelgren, Teresa Cerny-Koenig
Plants, Soils, and Climate Faculty Publications
We investigated wind effects on the water distribution pattern of a line source irrigation system experimental design that creates a decreasing linear moisture gradient and the growth of twelve perennial wildflower species. Species were randomly assigned to rows perpendicular to a main line of spray irrigation heads, parallel to the decreasing irrigation rates, and irrigated at 110% of evapotranspiration at the heads. At low wind speed (0.44 m/s, 1.4 ft/s), application rates decreased linearly from 50 mm/hr (2 in/hr) for positions closest to the irrigation line to zero at 4 m (12 ft) from the irrigation line. Application rates at …
Effects Of Irrigation And Mowing On Species Diversity Of Grass And Wildflower Mixtures For The Intermountain West, Daniel W. Dewey, Paul G. Johnson, Roger Kjelgren
Effects Of Irrigation And Mowing On Species Diversity Of Grass And Wildflower Mixtures For The Intermountain West, Daniel W. Dewey, Paul G. Johnson, Roger Kjelgren
Plants, Soils, and Climate Faculty Publications
Grass and wildflower mixtures can be aesthetically appealing, water-conserving, low-maintenance alternatives to conventional turfgrass. One problem with these mixtures is loss of species diversity over time. We examined the effects of irrigation and mowing on the species diversity of 3 grass and wild-flower mixtures. The nonirrigated and non-mowed treatment combination maintained diversity most effectively whereas the irrigated and mowed treatment combination was least effective. Generally, when the irrigation treatment was significant (P < 0.05), irrigated plots contained more wildflowers. When the mowing treatment was significant (P < 0.05), mowed plots contained more common yarrow (Achillea millefolium L. [Asteraceae]) and strawberry clover (Trifolium fragiferum L. [Fabaceae]) and fewer Pacific aster (Symphyotrichum chilense (Nees) Nesom [Asteraceae]). Height measurements on non-mowed plots showed that irrigated plots had taller canopies than nonirrigated plots. Common yarrow was the most competitive wildflower, followed by strawberry clover and Pacific aster. Mixture 3 containing crested wheatgrass (Agropyron cristatum (L.) Gaertn. [Poaceae]) and thickspike wheatgrass (Elymus lanceolatus (Scribn. & J.G. Sm.) Gould ssp. lanceolatus [Poaceae]) maintained species diversity for the longest duration under nonirrigated and non-mowed conditions.
Pot-In-Pot Production Of Six Intermountain West Native Herbaceous Perennial Species Grown In Containers, Guillermos Cardoso, Roger Kjelgren, Teresa Cerny-Koenig, Rich Koenig
Pot-In-Pot Production Of Six Intermountain West Native Herbaceous Perennial Species Grown In Containers, Guillermos Cardoso, Roger Kjelgren, Teresa Cerny-Koenig, Rich Koenig
Plants, Soils, and Climate Faculty Publications
We investigated the performance of six Intermountain West (IMW) native herbaceous perennial species grown in a pot-in-pot (PIP) or conventional above-ground (CAG) production system for two years. Three different species were grown for two production cycles each year. Root zone temperature (RZT), plant and container water loss, stomal conductance, plant height, and final biomass were measured. The RZT of plants in the PIP system were as much as 7C cooler than the CAG system, with temperature differences greater at the edge than at the center of the container. water loss was approximately 10% lower for PIP plants on five of …
Use Of Thermal Dissipation Probes To Estimate Water Loss Of Containerized Landscape Trees, Thayne Montague, Roger Kjelgren
Use Of Thermal Dissipation Probes To Estimate Water Loss Of Containerized Landscape Trees, Thayne Montague, Roger Kjelgren
Plants, Soils, and Climate Faculty Publications
Granier style thermal dissipation probes (TDPs) have been used to estimate whole plant water use on a variety of tree and vine species. However, studies using TDPs and load cells (gravimetric water loss) to estimate water use of landscape tree species are rare. This research compared gravimetric water loss (extimated with load cells) of four containerized landscape tree species with water loss estimated with TDPs. Over a 66 day period, an experiment compared water loss of three established, 5.0 cm (2 in) caliper poplar (Populus nigra 'Italica') trees in 75-liter (20 gal) containers on load cells to TDP estimated water …
Micro-Structural And Phase Configuration Effects Determining Water Content: Dielectric Relationships Of Aggregated Porous Media, J. M. Blonquist, Jr., Scott B. Jones, I. Lebron, D. A. Robinson
Micro-Structural And Phase Configuration Effects Determining Water Content: Dielectric Relationships Of Aggregated Porous Media, J. M. Blonquist, Jr., Scott B. Jones, I. Lebron, D. A. Robinson
Plants, Soils, and Climate Faculty Publications
Many porous media in which we determine water content are aggregated and characterized by a dual-porosity pore network, composed of interaggregate pores and intra-aggregate pores. This paper reports sample-scale permittivity measurements made in four stable aggregate media with dual porosity. Results indicate two distinct dielectric responses depending on whether the aggregates are surrounded by water or air. We relate transitions in the permittivity response to the water retention characteristic (WRC), showing that after the interaggregate pores have drained, the slope of the water content–permittivity relationship is significantly reduced (permittivity values ranging from 5 to 7). The hydraulic critical water content …
Stewardship And The Concept Of Yield In Landscape Water Conservation, Larry A. Rupp, Roger Kjelgren
Stewardship And The Concept Of Yield In Landscape Water Conservation, Larry A. Rupp, Roger Kjelgren
Plants, Soils, and Climate Faculty Publications
Growing up in what was rural Salt Lake County, my peers and I never knew a time when questions of water did not flow through our lives as surely as it flowed through the canals and irrigation ditches. We played in the flood of water pumped from the ditch onto our lawn, and we floated homemade rafts down the canal in the heat of the summer. We listened in amazement to descriptions of how the canals were built and wondered when we would be big enough to be asked to join the cooperative crew that skimmed the ditches in the …