Effect of Integrated Weed Management Methods on Yield and Yield Components of Pinto Bean (Phaseolus vulgaris L.)

In order to evaluate the effect of management methods on weeds, grain yield and yield components of pinto bean (Phaseolus vulgaris L.) an experiment was conducted at the Research Farm of Agricultural Faculty, University of Tabriz, Iran, in 2015. The experiment was carried out as factorial based on a randomized complete blocks design with three replications. The first factor was non-chemical weed management at four levels including one hand weeding, wheat straw mulch, cowpea living mulch and no chemical control and the second factor was four levels of imazethapyr dose as 0, 50, 75 and 100 % of the recommended herbicide dose (1.0 L.ha-1). Also the weed-free treatment during whole season was considered as control. Results indicated that different weed management treatments had significant effect on weed biomass, pod number per plant, grain number per plant, pinto bean grain yield and gross income. The lowest weed biomass was obtained in 100% herbicide dose with hand weeding treatment (107 g.m-2) and the highest one observed in 0% herbicide dose with no management (511 g.m-2). The highest pod number per plant and grain number per plant were observed in 100% herbicide dose with hand weeding treatment. The weed biomass in 75% imazethapyr + hand weeding was not significantly different than that of 100% imazethapyr + hand weeding treatment The lowest weed biomass and highest pinto bean grain yield was obtained in 100% herbicide dose with hand weeding treatment that was not significantly different with 75% herbicide dose with the same treatment. We can conclude that application of non-chemical managements as integrated with reduced dose of imazethapyr could have suitable efficacy in weed management of pinto bean and reduce herbicide application.