Effects of weeding and different herbicides on weed control in common bean (Phaseolus vulgaris L.)

A Field experiment was conducted in order to investigate effects of weeding, Trifluralin (pre-sowing herbicide), Haloxyfop ethoxyethyl, Bentazon, Sethoxydim (post-emergenc herbicides) and a combination of these treatments on weed control in common bean. The experiment was carried out in 2000-2001 using RCBD with 10 treatments and 4 replications at the Azad University of Shahr-e-Rey experimental field station. Results showed that highest yield (581.1 g/m2) was achived from Trifluralin + twice weeding treatment followed by, twice weeding (527.6 g/m2). Maximum yield (466.4 g/m2) from post emergence herbicides group was obtained from Trifluralin + Haloxyfop ethoxyethyl treatment. Treatments in which weeding was included were the best. This finding signifies the importance of weeding in common bean crop production. Results of this experiment indicate that sole application of pre-sowing herbicide (Trifluralin) for weed control in common bean is not effective. However, in order to control weeds in common bean we suggest application of Trifluralin together with twice hand weeding. Hand weeding in small fields with cheap workers is economically acceptable. Otherwise, a combination of Trifluralin (pre-sowing herbicide) and Haloxyfop ethoxyethyl (post-emergence herbicide) should be applied.