New tool for cleaning up soils and waterways: Prickly pear Phys.org
A U.S. Department of Agriculture (USDA) scientist has discovered what may be an effective tool for cleaning up soils and waterways in parts of California's San Joaquin Valley: a drought-tolerant cactus.
Ancient seas once covered the west side of the valley, and those seas left behind marine sediments, shale formations and deposits of selenium and other minerals in the soil. Crops grown there need to be irrigated, but the resulting runoff, when it contains high levels of selenium, can be toxic to fish, migratory birds, and other wildlife that drink from waterways and drainage ditches. Selenium runoff is subject to monitoring by regional water quality officials.