The relationship between agricultural productivity to applied on-farm field mechanized practices can never be overemphasized. The level of mechanization techniques applied by farmers for various agricultural operations in Ibaji Local Government Area (ILGA) was a determinant of their productivity output. Research analysis findings revealed that both manual and mechanical power sources at varying levels of utilization were used among the farmers. In assessing these impacts on their agricultural productivity, farmers’ low literacy level of 18 % negatively affected agricultural mechanization practice. This was determined by establishing a relationship between mechanical farm power inputs and the level of human involvement in each operation. Mechanization Index (MI) for the level of mechanical power used was also determined. Other productivity functions were used as indicators. From the results, 55.31 and 23.73 % were recorded as the highest and lowest levels of mechanical power inputs, respectively. While; 0.9822 and 0.9659 represented the highest and lowest average MI, respectively, it revealed the underutilization of mechanical power, hence, the high reliance on human power for most farming operations, which contributed only to 0.014 ha/kwhr as the largest cultivated farmland by farmers across the studied ten (10) communities in ILGA.