The possibility of chemical weed control in nursery of orange coneflower) Rudbeckia fulgida(and moss rose (Portulaca grandiflor)

In order to investigate chemical control of weeds in nursery of orange coneflower and moss rose two experiments were conducted in Randomized Complete Block Design (RCBD) with four replications in 2011. Treatments were Per-plant trifluralin (EC48 percent) with and without incorporation with soil at 0. 2 and 0. 3 ml/m2، Per-emergence and Post-emergence oxyfluorfen (EC24 percent) at 0. 2 and 0. 3 ml/m2، Pre-plant chlorthal-dimethyl (WP48 percent) at one g/m2، two-times hand weeding، weedy and without weed control. Results showed that the use of all herbicide avoided germination of moss rose، thus chemical control of weeds was not recommended. In orange coneflower، kochia، pigweed، lamb''squarters، purslane (broad-leaf weeds) and monocots were controlled by terifluralin، but poor control of common mallow، velvetleafand venice mallow was achieved. Chlorthal-dimethyl had less efficiency in control of broad-leaf and grass weeds comparing to other herbicides. The best treatment for the control of weeds in the nursery of orange coneflower was trifluralin + hand weeding.