Table 1. Description of site, tree, and maintenance activities on six urban landscapes studied in Moscow, Idaho, and Pullman, Washington, in 2002 and 2003. Fertilization (NPK) Landscape type Age (yr) New residential 3 to 5 Genus species Acer platanoides, Acer rubrum, Betula nigra, Carpinus caroliniana, Quercus rubra Old residential 57 to 63 Aesculus hippocastanum, Crataegus spp., Populus deltoides, Juglans nigra, Tilia americana Park 52 to 102 Aesculus hippocastanum, Acer platanoides, Acer rubrum, Acer saccharinum, Fraxinus pennsylvanica, Ulmus americana Street tree New mulch 30 to 60 1 to 6 Acer platanoides, Fraxinus pennsylvanica Acer platanoides, Fraxinus pennsylvanica, Gleditisia triacanthos Old mulch 15 to 20 Acer platanoides, Celtis occidentalis, Crataegus spp., Quercus rubra 6 to 7 12 to 16 None 7 to 14 Underground Not applicable 3 to 10 22.8 2 to 3 4 to 5 None 7 to 14 Underground Not applicable 6 to 10 26.0 10 to 20 38 to 63 0 to 1 0 to 7 Sprinkler and underground 1 Mulch mow Not applicable 49.3 10 to 26 46 to 87 1 to 2 Height (m) Dbh (cm) broadcast (yr−1 ) 2 to 5 5 to 8 2 No. wk−1 Irrigation Type No. wk−1 Lawn mowing Clippings 7 to 14 Underground 1 to 2 Mulch mow and often removed 10 to 24 45 to 85 0 to 1 1 to 14 Sprinkler and underground 1 Mulch mow and often removed 1 to 14 Sprinkler and underground 1 Mulch (cm) Site quality index* Not applicable 10.5 Not applicable 65.8 Mulch mow Not applicable 89.0 *SQI Mean landscape age + fertilization value (0, 1, or 2), + irrigation value (0, 1, or 2), + grass clipping value (0, 1, or 2), + mulching value (0, 1, or 2) For example, sites fertilized twice annually received a value of 2 and those without fertilization received a 0. 182 Scharenbroch and Lloyd: Particulate Organic Matter and Soil Nitrogen Availability ©2006 International Society of Arboriculture
July 2006
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