Growth and Water Use During Establishment of Irrigated Bare Root and Balled-Burlap Green Ash Transplanted Into A High Desert Landscape

in HortScience

We investigated growth, water relations, and water use of bare root (BR) and balled-burlapped (BB) Patmore green ash following transplanting into an irrigated landscape setting in a high desert climate. Treatments were green ash harvested as larger (40 mm caliper) BB and BR trees, and smaller BR stock (25 mm caliper). During establishment, we measured canopy growth for 3 years, and for 2 years plant water relations [predawn water potential and midday stomatal conductance (gS)] and water depletion within the root zone. All treatments expressed varying degrees of isohydric responses to root loss by reducing gS that maintained water potential nearly constant, but least so for the smaller BR trees. gS was greater than that of all larger trees, meaning that for the same cost in water potential as the larger trees, BR-Small benefitted from more open stomates and presumably greater carbon gain. Greater initial conductance apparently translated into more growth. Year 1, BR-Small trees had the least total leaf area, but by Year 3 total leaf area was not different among all treatments. Also during Year 1, the ratio of water use to local reference evapotranspiration [plant factor (PF)] was 0.36 for large BR trees vs. 0.56 for BB trees, similar to the recommended PF of 0.5 for trees in dry climates. These results suggest smaller BR trees are a cheaper alternative for high desert landscapes while reaching nearly equivalent growth to BB trees after 3 years. Achieving high growth of BR trees would need careful scheduling of irrigation amount and frequency based on leaf area, root zone size, and local reference evapotranspiration.

Contributor Notes

We thank the Utah Agricultural Experiment Station for financial support (Utah Agricultural Experiment Station paper 8935).

Corresponding author. E-mail: roger.kjelgren@usu.edu.

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    (A) 30-year (1980–2010) daily probability of precipitation from the Utah State University Logan, UT Global Historical Climate Network (GHCN) weather station. Daily, plus actual precipitation during the study period from an on-site weather station; (B) 30-year average daily reference evapotranspiration (ETo) also from the same GHCN weather station calculated using Tmax/Tmin input into the Hargreaves equation, plus Penman-Monteith ET collected from an on-site weather station during the study.

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    Midday stomatal conductance and daily high vapor pressure deficit (VPD) in an irrigated high desert environment for green ash (Fraxinus pennsylvanica ‘Patmore’) for (A) first year following transplanting, and (B) second year following transplanting. Treatments were BB-Large (balled and burlapped, 40 mm trunk diameter), BR-Large (bare root, 40 mm trunk diameter), and BR-Small (bare root 25 mm trunk diameter). Data points represent mean plus standard error.

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    Rainfall during study period and predawn and midday leaf water potential for green ash (Fraxinus pennsylvanica ‘Patmore’) over 2 years following transplanting in an irrigated high desert environment. Treatments were BB-Large (balled and burlapped, 40 mm trunk caliper), BR-Large (bare root, 40 mm trunk diameter), and BR-Small (bare root, 25 mm trunk diameter). Data points represent mean plus standard error.

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    Mean water use of green ash over (Fraxinus pennsylvanica ‘Patmore’) 2 years following transplanting in an irrigated high desert environment. Treatments were BB-Large (balled and burlapped, 40 mm trunk diameter), and BR-Large (bare root, 40 mm trunk diameter). Water use measured as water depletion within root zone and in ambient soil surrounding the hole excavated for planting. Each bar is a mean of four trees, plus standard error.

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