Science and Education Publishing World Journal of Analytical Chemistry 2333-1283 4 2 2016 7 2 Estimating the Degradation Half-life of Herbicides in the Soil Using Computer-developed Models 17 18 EN Timothy M. Akpomie Federal University Lafia, Lafia, Nigeria Eno O. Ekanem Janet O. Akpomie WJAC2016421 10.12691/wjac-4-2-1 2016 2 1 2016 5 16 2016 6 30 The researchers carried out this study in order to develop an appropriate model for estimating the degradation half-life of soil-applied herbicide. The results of the effect of pH and time on the degradation of atrazine in untreated Ningi soil of Bauchi State, Nigeria, was used as the input to a Minitab computer programme. The software or programme was used to develop the model for estimating or forecasting the degradation half-life of the herbicide in the soil. The developed model: T1/2(days) = 175 - 5.63C(ppm) - 12pH was found to be remarkable and provided insight as to how long half of the initial Concentration of the applied herbicide would remain un-degraded. This obviously would be an invaluable index in estimating the extent of persistence of the herbicide in the soil, water (due to leaching through the soil profile) or even plant uptake.