SHANKO BAKURE TUFA2026-01-272021https://etd.hu.edu.et/handle/123456789/254Common bean (Phaseolus vulgaris L.) is one of the major grain legumes grown in various parts of Ethiopia. Despite, the productivity and quality of bean crops was determined due to lack of improved varieties, poor soil fertility, lack of optimum planting date, row and plant spacing, weed and disease control, and weather conditions. Hence, two field experiments were conducted at Arsi Negele and Melkassa Agricultural Research Center during 2019 main cropping seasons to evaluate the effect of plant density on growth, yield and yield components of common bean varieties. The treatments includes: three plant spacing (5, 10, and 15cm), three row-spacing (30, 40, and 50cm) and three released common bean (Dame, SER-119 and KAT-B9) varieties laid out in factorial arrangement with RCBD design in three replications. The results revealed that plant height, leaf area, leaf area index, number of primary branches, shoot dry weight, initial and final stand count as well as nodulation parameters such as nodule number and dry weight were significantly (P < 0.05) affected by plant spacing, row spacing and varieties at both study sites. Similarly, pods plant-1 , seeds pod-1 , total dry biomass and grain yield were significantly influenced by plant spacing, row spacing and varieties at both locations. Hundred seed weight was affected by all factors at both sites. Harvest index was affected only by varieties at MARC, whereas all factors affected the harvest index at Arsi Negele. The narrower row and plant spacing (30 x 5, 40 x 5 and 50 x 5) had higher total dry biomass. The economic analysis indicated that the highest net benefits (32417.1, 31117.72, 30303.47 and 32233.61 ETB) were obtained from the treatment combinations of (50 cm x 10 cm and 30 cm x 15 cm) with SER-119, (40 cm x 5 cm) with dame and (50 cm x 5 cm) with KATB9 at both studied sites respectively. In addition to these treatment combinations of (40 cm x 10 cm, 40 cm x 15 and 50 cm x 15 cm) were also worth’s better yield for all the three given varieties. From this research output varieties SER-119 and KAT-B9 performs better yields ha -1 at Arsi Negele and MARC, whereas; Dame achieves better yield at Arsi Negele than MARC. Finally, repeated researches have been conducted to confirm the outcomes on similar agroecological zones in depth.en-USCommon bean varietiescrop growthplant spacingrow spacingnodulation and yield.Thesis