Effect of planting pattern and weeding frequency on weed infestation, yield and yield components of faba bean in Bale Highlands, South Eastern Ethiopia
Keywords:Faba bean, planting pattern, weeding frequency, yield and yield components, Ethiopia.
AbstractWeed interference is one of the most important production constraints causing up to 80% reduction inÂ potential yield of Faba bean (Vicia faba L.). Considering this, an experiment was conducted at MaddaÂ Walabu University (MWU) and Sinana Agricultural Research Center (SARC) during 2018 main croppingÂ season to evaluate the effect of planting pattern and weeding frequency on weed infestation, yield and yieldÂ components of Faba bean. There were 18 treatment combinations of three planting patterns (30 cm x 10 cm,Â 40 cm x 10 cm and 30 cm x 15 cm) and six weeding frequencies viz., one hand weeding and hoeing at twoÂ weeks after crop emergence (WACE); one hand weeding and hoeing at three WACE; one hand weeding andÂ hoeing at four WACE; two hand weeding and hoeing at two and five WACE; weed free check and weedyÂ check. Factorial combined treatments were laid out in Randomized Complete Block Design (RCBD) withÂ three replications. Results showed the weed species diversity was higher at MWU than SARC. Weed dryÂ biomass was significantly (p<0.05) affected by main effects of site while days to 50 % flowering, days toÂ 90% physiological maturity, plant height and harvest index were highly significantly (p<0.01) affected byÂ a main effects of site. Total weed density and hundred seed weight were significantly (p<0.05) affected andÂ days to 50% flowering and crop plant stand showed highly significant (p<0.01) affected by main effects ofÂ planting pattern. The highest grain yield (4135.8 kg/ha) obtained from 30 cm x 15 cm planting pattern withÂ two hand hoeing and weeding at two and five WACE at SARC and un-restricted weed infestation reducedÂ faba bean yield up to 77.2%. The 30 cm x 15 cm planting pattern with two hand hoeing and weeding at twoÂ and five WACE had highest net benefit (42,566 Birr/ha) and marginal rate of return (1193). Thus, plantingÂ faba bean at the spacing of 30 cm between rows and 15 cm between plants and weeding the crop by handÂ hoeing twice at two and five WACE resulted in optimum growth and grain yield of faba bean. Therefore, thisÂ can be recommended for Bale high land and similar agro-ecology in South Eastern Ethiopia.
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