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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    EFFECT OF NPS AND UREA FERTILIZER RATE ON YIELD AND YIELD COMPONENT OF HEAD CABBAGE (Brassica oleracea L.) AT KOFALE DISTRICT, OROMIA REGIONAL STATE, ETHIOPIA
    (Hawassa University College of Agriculture, 2024) MULUWERK ADDISU
    Cabbage is one of the most popular and widely grown vegetable crops in the world. Among the factors responsible for low yields in cabbage, unbalanced use of N and NPS fertilizer was considered the major problem causing a high reduction in the potential yield of cabbage. Hence, a field experiment was conducted in 2023 main cropping season to investigate the effect of N and NPS fertilizer on growth, yield, and yield components of cabbage in Kofale district. The experiment consisted of a factorial combination of three rates of NPS (0, 100, and 200 kg ha -1 ) and four rates of nitrogen (0, 100, 200, and 300 kg ha-1). The interaction effects of N and NPS fertilizer were found to have a significant impact on days to 50% head initiation, days to 90% head maturity, plant height, leaf length, leaf width, head length, head width, folded number of leaf head diameter, fresh and dry head weight, and marketable head yield. The highest head dry weight (0.174 kg plant -1 ) and marketable 118.34 t ha -1 ) head yields were obtained by 200 kg ha -1 NPS and 300kg ha -1 N rate of fertilizer, which were significantly on par with 100 kg ha -1 NPS and 300 kg ha -1 N rate of fertilizer that recorded 118.01 t ha -1 marketable head yields of cabbage. Therefore, the use of 200 kg ha -1 NPS and 300 kg ha-1 N can tentatively be recommended for cabbage producers in the study area.
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    EFFECTS OF INOCULANT AND NPS FERTILIZER ON NODULATION, GROWTH AND YIELDS OF COMMON BEAN (Phaseolus vulgaris L.) VARIETIES AT BILATE ZURIA DISTRICT, SIDAMA REGIONAL STATE, ETHIOPIA
    (Hawassa University College of Agriculture, 2021) ENJAMO NAGESSO SATO
    Common bean (Phaseolus vulgaris L.) is a major grain legume grown and consumed in subSaharan Africa, including Ethiopia. It is the most important food legume, fodder and cover crop. However, its cultivation is globally constrained mainly by low soil fertility and lack of improved agronomic practices. Four common bean varieties (Ibaddo, Hawassa Dume, Omo95 and Nasir were studied under three nutrient conditions (0kg ha-1 ,100 kg ha-1 NPS, Inoculation by strain HB-429) in three replication of randomized complete block design (RCBD) during the 2019 main cropping season (June to September). The objectives of the study were investigating the response these varieties to the three nutrient statuses in nodulation, growth, yield and yield components and investigating the variety X inoculant/fertilizer interaction in the same traits. There were significant differences between the four varieties in all traits (nodulation, growth, yield and yield components). Ibaddo had the highest grain yield (2.81 t ha-1 ) while Hawassa Dume had the highest mean in yield (2.53 t ha-1 ). The three fertilizer levels also differed significantly in all traits, 100 kg ha-1 NPS giving the highest means in all traits, while the control (no fertilizer application) had the lowest mean in all traits. Inoculation by rhizobium strain had intermediate mean of all traits. The variety X inoculant/fertilizer interaction was also significant for all traits except for nodule dry weight, leaf area index, shoot dry weight, grain yield, above biological yield and harvest index. Omo95 variety had the lowest means in all traits except leaf area index, plant height, number of primary branches where ranks first, second and third. The highest net return (48325 ETB ha-1 ) with acceptable marginal rate return (5993%) was obtained from Hawassa Dume variety with 100 kg NPS ha-1 followed by Hawassa Dume variety with strain HB-429 inoculation had net return of 41337 ETB ha-1 with 4895% marginal rate of return. This implies that the grower on the study area can gate additional benefit of 59.93 and 48.95 ETB for every 1 ETB expense by growing Hawassa Dume with the application of 100 kg NPS ha-1 and strain HB-429 inoculation, in that order. Moreover, the highest net benefits (37763.5) with MRR (%) of 3084 ETB and net benefits of 3935ETB with MRR (%) obtained from variety Ibaddo and Nasir grown with strain HB-429 and 100 kg NPS ha-1 fertilizer application. Therefore, use of both Hawassa Dume and Nasir varieties with 100 kg NPS ha-1 and Hawassa Dume and Ibaddo grown with strain HB-429 found to be economically feasible at the study area. However, verification of the result on farmers’ fields across season and similar areas could be required before wide use of this study to put the recommendation in firm ground.