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Uganda, 125, 158 Ulva fasciata, 206f

Ulva lactuca, 206f Ulva rigida, 206f Ulva spp. estuarine ecosystems, 163-164 integrated multitrophic aquaculture (IMTA) Israel, 206, 206f South Africa, 205, 206f propagation methods, 186 Undaria peteroseniana, 194 Undaria pinnatifida, 194 Undaria spp. cultivation systems, 194, 196f production data, 187t propagation methods, 186 Undaria undarioides, 194 Uniola paniculata, 59 United Kingdom constructed wetlands, 153-154, 157, 158 organic farming, 211, 213f sewage treatment systems, 135, 136f, 148 sludge composition, 234t sludge production, 242t soil loss by harvesting, 254t wetland ecosystems, 52t United Kingdom Woodland Assurance Scheme

(UKWAS), 282 United States constructed wetlands, 156t, 157, 158 dune ecosystems, 61 mining activities, 92 organic farming, 213f seagrasses, 69 sludge composition, 234t sludge production, 242t tidal wetlands, 64 wetland ecosystems, 52t universal soil loss equation (USLE), 103 University of North Texas, Texas (USA) stream ecosystems, 116t, 326, 328 wastewater, 142f urbanization, 3

urbanization and industrialization, 4f urea constructed wetlands, 156-157 uric acid sludge composition, 234t Urtica dioica, 106-109, 140 U.S. Bureau of Mines, 227

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