The study found out the impact of acacia trees on soil nitrogen and how this nitrogen consequently influences the grass crude protein in Sanga rangeland. Four 100×100m plots were randomly selected in a vast area, five acacia trees and five open areas randomly identified in each plot. A soil and pasture sample were collected from each acacia tree and in open area. Samples were analyzed by Kjeldahl's method to determine percentage soil nitrogen and grass crude protein. The results were subjected to analysis of variance using MINITAB 14 statistical software. Percentage soil nitrogen and grass crude protein significantly differed between under acacia and away from acacia with P=0.001 and P=0.00
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