Snap bean is a leading exportable vegetable crop in Ethiopia. However, its phenology and growth parameters are very low and poor due to inadequate moisture and poor soil fertility. Therefore; field experiment was conducted at MARC during the dry season in 2017 and 2018 to evaluate the effect phosphorus and sulfur) fertilizers under different irrigation regimes on phenology and growth of snap bean. The experiment was laid out in split-plot design with three replications. Four drip irrigation regimes (100, 85, 70 and 55% ETc) were assigned to the main-plots. Four fertilizer types (0, 21 kg P ha-1, 30 kg S ha-1 and 21 kg P ha-1+30 kg S ha-1) were randomly allocated to the sub-plots. The analysis of variance revealed that the interaction effect of irrigation regimes and fertilizers had a significant (P<0.05) effect on LAI and CGR. The main effect of various irrigation regimes had a significant (P<0.05) effect on all phenology and growth parameters. On the other hand, application of different fertilizers types had non-significant effect in all parameters, except leaf dry weight. The best phenology and growth of snap bean was recorded from the interaction effect of 100 and 85% ETc with different applications of fertilizers types. Therefore; 85% ETc without fertilizers application where scarcity of irrigation water is limiting and 100% ETc without fertilizers application where there are no water shortages.

Keywords: Biomass, Canopy width, ETc, Plant height