**ABSTRACT **

Genotypic differences in biomass yield of many crops are mainly associated with variations in leaf area. Physiological growth analysis is the important in prediction of the performance of genotypes during plant growth. Therefore, the field experiment was conducted to study growth characteristics of common bean genotypes at Hawassa university agriculture research site. Three genotypes including Red Wolayita, Hawassa Deme and Ibado were evaluated in randomized complete block design with four replications during 2017 using irrigation. Growth analysis was done using primary data from two successive samplings in 20 days interval during linear vegetative growth stage and flowering stage. Growth parameters, specific leaf area (SLA), leaf area ratio (LAR), leaf area ratio (LAI), net assimilation rate (NAR), crop growth rate (CGR), relative growth rate (RGR) and biomass yield and their correlation were determined. The study result revealed that, Red Wollita had the highest specific leaf area (241.975 cm^{2 }g^{-1}) and leaf area ratio (161.36 cm^{2 }g^{-1}), Hawassa Deme had the highest net assimilation rate (27.5 mg dm^{-2 }Day^{-1}), leaf area index (1.35), relative growth rate (48.02 gg^{-1 }day^{-1}), average growth rate (0.1g day^{-1}), crop growth rate (0.03g m^{-2} day^{-1}) and biomass yield (2989.6 kg/ha). The ANOVA result indicated that, there was highly significant difference (p < 0.01) among genotypes for biomass yield. Correlation of major growth parameters with biomass yield was investigated. Biomass yield had positively highly correlated with net assimilation rate, absolute growth rate, relative growth rate and crop growth rate with correlation coefficient of (r = 0.39, 0.33, 0.42 and 0.56), respectively.

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