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 ARBUSCULAR MYCORRHIZA FUNGI ON MORPHOPHYSIOLOGY AND NUTRIENT UPTAKE OF COMMON BEAN (Phaseolues vulgaris L.) VARIETIES UNDER DIFFERENT MOISTURE CONDITIONS
    (Hawassa University College of Agriculture, 2025) BIRTUKAN AREDA GOFE
    Common bean is a suitable crop for food security due to its short growing cycle and adaptability to different cropping systems. However, its productivity is limited by factors such as moisture stress. To mitigate such effect, soil amendments with beneficial symbiotic rhizosphere microbes such as Arbuscular mycorrhizal fungi (AMF) is one of the strateg ies. Hence, this experiment was aimed at evaluating the effect of AMF on moisture stress tolerance and nutrient uptake of three common bean varieties. A pot experiment was conducted from June to September 2024 at Hawassa University College of Agriculture in a Shade house. The experiment used three common bean varieties, SER-119, Dame, and Awash Metene; AMF inoculation and two moisture conditions (80% FC and 40% FC) as a combined treatment. The experiment was executed as a factorial arrangement using a completely randomized design with three replications. The results of this study indicated that the main effect of moisture stress, variety and AMF, and their interaction had a significant impact on most of the phenological, morpho -physiology, nutrient uptake, microbial traits and yield and yield components of common beans. Even though almost all parameters significantly decreased under 40% FC, the AMF inoculation significantly improved seed emergence, days to 50% flowering, pod setting and physiological maturity under moisture stress conditions at 40 % FC. Similarly, the stem and leaf traits are significantly affected by the inoculation of AMF under moisture -stressed conditions. Physiological responses mainly Photosynthesis rate, stomata conductance, chlo rophyll a, chlorophyll b, total chlorophyll, transpiration rate and stomata length were improved by AMF inoculation under 40 % FC. Yield and yield components, specifically pod length, thousand seed weight, seed weight, number of seed s per pod, total above ground biomass fresh weight, total above ground biomass and total below ground fresh weight were enhanced by AMF inoculation under 40 % FC. Tissue nitrogen was also enhanced by AMF under 040%FC. Overall, the study found that even though highest values were recorded under 80% FC with AMF treatment, the presence of AMF significantly improved the response of the verities under stress conditions at 40% FC
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    ASSESSMENT OF SWEETPOTATO (Ipomea batatas L.) PRODUCTION AND EVALUATION OF DIFFERENT STORAGE MATERIALS FOR ROOTS TO BE USED AS A SOURCE OF PLANTING MATERIAL
    (Hawassa University College of Agriculture, 2020) TINSAE ABRHAM AMANUEL
    Sweetpotato is commonly known as the poor man’s crop in Ethiopia and one of the food security crops in the country. However, its production and productivity is constrained by the limited access of quality planting material at the onset of the rainy season. Therefore, a household survey was conducted to determine its major production constraints in the three major sweetpotato growing Kebeles (Gere Bulgita, Tikare Kokere and Wera Boshera) of Misrak Badewacho district. Purposive sampling technique was used to select the households. The result revealed that drought (27%), rodents attack during storage (42%), shortage of planting materials (15%) and lack of suitable storage (30%) were identified as the major sweetpotato production constraints in the study area. Based on the survey result the second experiment was conducted to evaluate the storage and growth performance of roots of selected sweetpotato varieties under different storage types as sources of planting materials. The experiment was consisted of three sweetpotato varieties (Awassa-83, Ogan-Sagan and Wolaita-local) with five storage types (straw, soil, ash, sawdust and sand storage) in Complete Randomized Design in three replications. Result revealed that, the combination of Awassa-83 variety and sand storage were performed better in percentage of decay, weight loss and weevil damage; whereas the main effects of variety and storage types were significantly different in length of vine and number of vine per storage. Thus, Awassa-83 variety stored in sand storage showed better performance after storage and can be recommended for maintaining the storage roots during dry periods and access of quality vines at the onset of the rainy season.
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    EFFECT OF NITROGEN FERTILIZER RATES ON GROWTH, YIELD AND YIELD COMPONENTS OF OAT (Avena sativa L.) VARIETIES AT ROBA EXPERIMENTAL SITE IN WAMANGYE ALKASO KEBELE, KOFELE DISTRICT, OROMIA REGIONAL STATE, SOUTHERN ETHIOPIA
    (Hawassa University College of Agriculture, 2024) HUSSEIN WATTA KALIYO
    Effect of Nitrogen Fertilizer Rates on Growth, Yield and Yield Components of Oat (Avena sativa L.) Varieties in Wamangye Alkaso Kebele, Kofele District, Oromia Regional State, Southern Ethiopia Hussein Watta Kaliyo (BSc) Hussein Mohammed ((PhD) Demalesh Kefale (PhD) Absence of nitrogen rate studies and lack of well adapted varieties are the major yield limiting factors for Oat growth and production in the study area. Thus, the experiment was conducted at Kofele District in the 2023 growing season (July - December) to evaluate the effect of nitrogen fertilizer rates on the growth, yield and yield components of oat varieties; and to identify economically appropriate combination of variety and nitrogen level that gives maximum forage and seed yield. Factorial combination of three oat varieties (WALQAA, WAS, SRCP) and five levels of nitrogen (0, 25, 50, 75, 100 kg ha -1 ) were studied in three replications of the Randomized Complete Block Design (RCBD). Data were collected and analyzed by using SAS statistical software. Results showed that the variety and Nitrogen main effects were significant for days to heading, days to physiological maturity, total tillers, effective tillers, spikes plant -1 , plant height, seeds plant -1 , forage yield, above ground biomass, thousand seeds weight, straw yield, grain yield and harvest index. The variety main effect was also significant for plant height at 30 day and 60 days after planting. The Variety x N interaction was significant for days to heading, total tillers, effective tillers, plant height at 90 days, days to physiological maturity, number of seeds per plant, forage yield, aboveground biomass, thousand seeds weight, grain yield, straw yield, and harvest index. The highest forage yield (24.46 t ha -1 ), above-ground biomass (22.5 t ha -1 ) and straw yield (20. 03 t ha -1 ) were obtained from variety WLAQAA at nitrogen rate of 75 and 100 kg ha -1 , respectively. The highest thousand seeds weight (39.30 gm) was obtained from variety SRCP at 100 kg of nitrogen ha -1 while the highest grain yield (6.39 t ha -1 ) was obtained from variety WAS at 75 kg of nitrogen ha-1 . The results of the research indicated that the best variety for forage yield was WALQAA while the best variety for grain yield was WAS. The economic analysis for forage yield revealed that the highest net benefit of 146,737.5 ETB ha -1 was obtained from variety WALQAA with 75 kg of nitrogen ha -1 which gave marginal rate of return (MRR) of 1,110.2%. However, the result of the present study needs to be evaluated and reconfirmed under different agro- ecologies in order to reach a conclusive recommendation. Keywords: Nitrogen fertili