College of Agriculture

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The College of Agriculture is committed to advancing agricultural education, research, and community service. It serves as a center for knowledge creation and dissemination in crop science, animal production, natural resource management, and sustainable agriculture.

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    EVALUATION OF WEED MANAGEMENT PRACTICES ON MUNG BEAN (Vigna radiata L.) YIELD AND YIELD COMPONENTS AT TEPPI, SOUTH WEST ETHIOPIA.
    (Hawassa University College of Agriculture, 2023) MULUKEN ASMAMAW
    Mung bean is characterized by fast growth, low water requirement, and excellent soil fertility enhancement through nitrogen fixation. The productivity of mung beans is decreased by weeds, diseases, and insect pests. Weed competition is among the most important factors responsible for the low yield of mung bean by as much as 87%. Therefore, this study was initiated to evaluate the effect of weed management practices on yield and yield components of mung bean (Vigna radiata L.). Nine control options (One-hand weeding at 4 weeks after sowing, complete weed control, No-weed control, Haloxyfop-R-methyl ester at 0.3, 0.6, and 0.3 kg ai ha⁻¹ + One-Hand weeding at 4 weeks after sowing, pendimethalin at 1, 1.5 and 1 kg ai ha⁻¹ + One-Hand weeding at 4 weeks after sowing) were compared in randomized complete block design in three replications. The application of herbicides and the weeding practices significantly reduced the broadleaf, sedge, and grass weeds. The highest grain yield (0.98 ton ha⁻¹), total dry biomass (2.82-ton ha⁻¹), and plant height (43.76 cm) were obtained in complete weed control followed by application of pendimethalin at 1.5 kg ai ha⁻¹ (0.92 ton ha⁻¹), total dry biomass (2.78 ton ha⁻¹), plant height (50.03 cm). The lowest grain yield (0.36 ton ha⁻¹), total dry biomass (1.59-ton ha⁻¹), and plant height (64.63 cm) were recorded from the No-weed control plot. The highest number of pods per plant, number of seeds per pod, and weight of a hundred seeds were recorded in complete weed control and application of pendimethalin at 1.5 kg ai ha⁻¹. The results indicated that complete weed control and/or control with pendimethalin at 1.5 kg ai ha⁻¹ were the best management practices to maximize economic benefit. Thus, we recommend using the applications of one of the two weed control methods for the management of weeds in mung bean in Teppi, South West Ethiopia, and locations with similar agroecologies of Teppi.
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    NODULATION, NITROGEN FIXATION AND YIELD POTENTIAL OF COMMON BEAN (Phaseolus vulgaris L.) VARIETIES UNDER SHADE
    (Hawassa University College of Agriculture, 2021) SELAMAWIT ASSEGID
    Common bean (Phaseolus vulgaris L.) is a herbaceous annual crop which in a symbiotic relationship with specific soil bacteria, ‘fixes’ atmospheric nitrogen (N 2 ) into amino form that can be used for plant growth.A field experiment was conducted to determine the effect of shade and Rhizobium inoculation on nitrogen fixation, nodulation, yield and yield components of three common bean varieties at Hawassa University Research Farm, Hawassa Southern Ethiopia. The experimental treatments consisted of a factorial combination of 2 levels of shade (25% shading and non-shading), 2 levels of inoculation (inoculated and non-inoculated) and three common bean varieties (HawassaDume, Nasir and Ibbado). The experiment was laid out as a randomized complete block design with four replications. The result showed that inoculation of common bean with Rhizobium strain HB-429 significantly affected all parameters compared to the non-inoculated plants in the field trial. The interactions of variety,shade and inoculation affects leaf area, leaf area index, specific leaf area,grain yield and 100 seed weight of common bean. The highest nodule number was recorded from rhizobium inoculated plots, while the lowest nodule number was recorded from the 25% shade treatments. Similarly the highest grain yield was recorded from inoculated Hawassa dume variety of open treatments while the lowest grain yield was recorded from non-inoculated Ibbado variety at 25% shade treatments.Also this study indicated inoculated Hawassa dume variety from the open treatments derived the greatest percentage of N from N 2 fixation and the lowest percentage of N was derived from non-inoculated Ibbado variety from the 25% shade treatments N uptake of common bean grown on full light had significantly greater N content than wheat this increase in N uptake of common bean is presumably derived from N2-fixation capacity of the legumes. Therefore, variety Hawassa dume inoculated with rhizobium strain HB-429 in open generated the highest seed yield. It would be worthwhile to do similar experiments on the area with the inclusion of more shade levels to refine the findings