Invasive plant species means species of plants not historically found in California that spread outside cultivated areas and can damage environmental or economic resources. Invasive species may be regulated by county agricultural agencies as noxious species. Lists of invasive plants are maintained at the California Invasive Plant Inventory and USDA invasive and noxious weeds database.
Biodiesel blend means a fuel comprised of a blend of biodiesel fuel with petroleum-based diesel fuel, suitable for use as a fuel in a compression-ignition internal combustion diesel engine.
Groundwater means all water, which is below the surface of the ground in the saturation zone and in direct contact with the ground or subsoil.
Soil texture means proportion by weight of sand, silt, and clay in a soil.
Soil means all unconsolidated mineral and organic material of any origin.