Effect of Spent Coffee Ground on Growth, Yield and Yield Components of Two Green Bean (Phaseolus vulgaris L.) Varieties at Jimma, South West Ethiopia

This experiment was conducted at Jimma with the objective of evaluating the effect of spent coffee ground on growth, yield and yield component of two green bean varieties. The treatments consisted of two green bean varieties namely, BC4.4 and Plati with eight amendments, six levels of spent coffee ground (2.5%, 5%, 7.5%, 10%, 12.5% and 0%), recommended rate of NPS and NPSB as a control). The experiment was laid out as a randomized complete block design with three replications. The results revealed that the difference between the two varieties was significant (P<0.05) for plant height, number of leaf, number of pod, pod length and total pod yield. Variety Plati gave maximum result for all listed parameters. Application of spent coffee ground had a significantly decreasing effect on all studied parameters compared to the control except number of nodule. The control treatment had statistically the largest plant height, number of leaves, number of pods, root volume, total pod yield and pod length. The interaction effects between variety Plati and control (NPSB) gave the highest total leaf area, root fresh weight, shoot and root dry weight and dry weight of pod whereas higher pod diameter was obtained from the interaction of variety BC4.4 and control (NPSB). The results revealed that application of recommended rate of NPSB fertilizer with Plati improved growth and yield component. It could also be added that growth, yield and yield components of green bean could not be increased by application of spent coffee ground.