Effect of Integrated Weed Management on Coffee Growth and Yield at Metu and Haru in South west and West Ethiopia

A field experiment was conducted to evaluate different single and integrated weed management methods on the growth and yield of coffee at Metu and Haru sub centers of Jimma Agricultural Research Center (JARC) between 2014-2018 cropping seasons. At Metu eight treatments were compared in randomized complete block design with three replications. The treatments included the following: (T1) One slash in May + one slash in August,(T2) Three slashing (May+Jully+Augesst), (T3) Roundup 3L/ha. sprayed  in may followed by one slashing in July followed by vetivar grass mulching in September , (T4) Roundup 3L/ha.sprayed  in May followed by soybean intercropping in July followed by mulching in September , (T5) Roundup 3L/ha. sprayed  in May haricot bean intercropping in June followed by mulching in September , (T6) Roundup 3L/ha (only for the first year) Desmodium cover crop all year round permanently , (T7) Vetch cover crop in June followed with one hand weeding , and (T8). Weed free (plots kept weed free all year round). At Haru nine treatments were compared in randomized complete block design with three replications. The treatments included: (T1)one to two  times slashing (farmers practice), (T2) three slashing in May, June and July, (T3) four slashing in May, June, July and August, (T4) Round up 3L/ha. sprayed in May followed by  slashing followed by mulching followed by slashing and followed by mulching: (T5) slashing followed by Roundup 3L/ha. followed by coffee husk mulching: (T6) Roundup 3L/ha  followed by desmodium cover cropping: (T7) Roundup 3L/ha  followed by vetch cover cropping: (T8) Roundup 3L/ha  followed by soybean intercropping followed by mulching: and  (T9) Weed free (plots kept weed free all year round).. The result raveled that at both locations the major weed species included perennial sedges, perennial grasses, and annual broad leaf At Metu herbicide followed by soybean intercropping and followed by mulching in September gave a mean yield of 13.6 quintal clean coffee. Similarly, desmodium cover cropping provided excellent weed control and resulted in mean yield of 13.7 q/ha clean coffee .Desmodium showed a high smothering effect of the highly competitive perennial sedges and grasses by inhibiting the incoming light reaching the soil compared with  other treatments and the weed free treatment.. At Haru Roundup 3L/ha followed by  slashing followed by mulching followed by slashing and followed by mulching gave consistently very high coffee yield with a mean yield of 21 quintal /ha. compared with other treatments. The weed free treatment gave low yield at both locations. Vetch and desmodium did not well established at Haru compared with Metu. DOI: 10.7176/DCS/10-7-02 Publication date: July 31 st 2020