Agronomy
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Item RESPONSE OF COMMON BEAN (Phaseolus vulgaris L.) VARIETIES TO DIFFERENT RATES OF PHOSPHORUS FERTILIZER AT NEGELLE BORENA, SOUTHERN ETHIOPIA(Hawassa University College of Agriculture, 2021) GADISA BEYENE FUFAEven though its production and demand is highly increasing in Ethiopia due to its fast maturity and nutritional value, Common bean productivity is constrained by soil phosphorus along with proper use of variety. In view of this problem, a field experiment was conducted at Negelle Borena, Southern Ethiopia under rain fed in 2020 cropping season to determine the optimum phosphorus rate needed to get the highest and economically feasible yield of Common bean variety. The experiment was designed in factorial combinations of five levels of Phosphorus (0, 23, 46, 69 and 92 kg ha-1 ) and three haricot bean variety (Hawassa Dume, Omo-95 and Nassir) in a Randomized Complete Block Design with three replications. Data on days to flowering, days to maturity, number of nodules plant-1 , number of leaves plant-1 , plant height, number of primary branches plant-1 , number of pod plant-1 , number of seed pod-1 , hundred seed weight, above ground biomass, grain yield and harvest index were recorded and subjected to analysis of variance using SAS software. The results revealed that both P rates and common bean variety had significant effect on days to flowering, days to maturity, number of leaves plant-1 , number of primary branches plant-1 , number of pods plant-1 , number of seeds pod-1 , total above ground biomass, hundred seed weight and grain yield.The interaction effect of phosphorus fertilizer rate and Common bean variety significantly influenced total of nodule number and effective nodules number plant-1 . All parameters tested were positively correlated except days to 50% flowering, days to maturity and leaves number plant-1 was Negatively correlated but plant height was not siginificant with grain yield . The highest grain yield (2.38 tons ha-1 and 2.11 tons ha-1 ) was recorded from 46 kg P ha-1 rate and Hawassa Dume Common Beanvariety, respectively.The highest net return (37,630 ETB ha1 ) with acceptable marginal rate return (1140.54 %) was obtained from Hawassa Dume variety with 46 kg P2O5 ha-1 application. This implies that the growers at the study area can get additional benefit of 11.4054 ETB for every 1 ETB expense by this treatment, followed by Hawassa Dume variety with 23 P2O5 kg ha-1 supply having a net return of 27,080ETB ha-1 . The lowest net economic return was recorded in the Omo-95 variety with zero-P application (17,550Birr ha-1 ). Thus, it can be concluded that application of 46 kg P ha1 and Hawassa dume haricot bean variety were found superior both in productivity and economically at Negelle Borena area.