Yield Components and Yield of Haricot Bean (Phaseolus vulgaris L.) Under Different Irrigation Frequency and Planting Density Treatments

摘要

An experiment was undertaken to determine the yield component and yield of haricot bean (Phaseolus vulgaris L.) varieties in the semi-arid region of Dire Dawa, Ethiopia. The experiment was a split plot with three irrigation frequencies as main plots and a combination of three planting densities and two haricot bean varieties as subplots, all of which replicated three times. Irrigation frequencies consisted of 1, 0.67, and 0.5 irrigation water to cumulative pan evaporation (IW/CPE ratio) thereby fixing the depth of IW to 60 mm, planting densities of 15.6, 25, and 35.7 (plants m~(-2)) and two haricot bean varieties, ‘Roba-1’ and ‘Mexican-142’ were considered. Different planting densities were employed by changing planting distances within cultivation rows. Plant data on dry biomass/plant, number of branches bearing pods, number of pods/primary branch, number of pods/plant, pod length and width, number of beans/pod, number of beans/plant, 100-bean weight and harvest index at harvest were recorded.Increasing irrigation frequency from 0.5 IW/CPE to 0.67 IW/CPE and to 1 IW/CPE significantly increased all parameters. On the contrary, increasing population densities caused a significant reduction in the parameters. Averaged over planting density andvariety, yield/ha and soil water depletion increased significantly with the increase in irrigation frequency. These results showed that irrigation given at 1 IW/CPE can give maximum yield of both haricot bean varieties in the semi-arid condition of DireDawa.