Abstract
Six woody landscape species were field-grown with 4 irrigation rates based on 0%, 25%, 50%, and 100% replacement of net evaporation from a class A pan. Optimum irrigation rates varied by species. Japanese holly ‘Petite Point’ (Ilex crenata ‘Petite Point’), flowering dogwood (Cornus florida), green ash (Fraxinus pennsylvanica), and river birch (Betula nigra) had greater growth when irrigated compared to non-irrigated plants. Increases in caliper due to trickle irrigation occurred during the second growing season for 3 tree species. Growth of Pyrus calleryana ‘Bradford’ (‘Bradford’ pear) and pin oak (Quercus palustris) was similar regardless of irrigation rates. Only ‘Petite Point’ Japanese holly had improved livability as a result of trickle irrigation.
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