Abstract— Among several agroforestry practices in the east Hararghe of Ethiopia, Parkland agroforestry practices are common. However, the effect of tree species on the grain yield and above ground biomass of Sorghum has not scientifically quantified in the study area. Therefore, the study was conducted to investigating the effect of parkland trees on the grain yield and above ground biomass of Sorghum at Fedis District, Oromia, Ethiopia. Six isolated and nearly similar F. albida and C. africana trees of each species growing on similar site conditions were selected and the canopy coverage of each tree was divided into four radial transects. Three plots from the tree trunk were established for assessing the sorghum yields and above ground biomass. Sorghum yield and biomass samples from three horizontal distances: 2.5m, 5.0m and 25m were collected for analysis of Sorghum yield and biomass .The result revealed that sorghum grain yield were significantly (p<0.05) higher under the tree canopies than open field that means its higher by 2089.51 and 1789.53 kg /ha under F. albida and C. africana respectively at the distance of 2.5m and these values decreased to 1459.40 and 1266.01 kg /ha under F. albida and C. africana respectively, at the distance of 25m. The mean biomass recorded at three different distances from the two tree trunks, were not differently significant statistically (p >0.05). The research finding showed that trees have positive relation with grain yield and above ground biomass of sorghum. Hence, the growing of Faidherbia albida and Cordia africana trees on small holder farms improve crop productivity for improvement of this Parkland agroforestry system.
Keywords— Fedis District, Parkland Agroforestry, Canopy cover, sorghum yield, open field.
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