Research was carried out to investigate the residual persistence of the organophosphatcs,diazinon and pirimiphos-methyl on sugar-beet plants (vegetative parts and roots) and the contamination of soil with these chemicals under the treated plants. The residue half-life values (RL50) determined on vegetative parts and soil reached 14.86 and 47.53 hours for diazinon and 12.05 and 59.41 hours for pirimiphos‌methyl, respectively. In the vegetative parts, the initial amount detected for diazinon (4.93 ppm) was less than the initial amount detected for pirimiphos‌methyl (10.54 ppm). The initial concentration was not detected in sug‌ar-beet roots for diazinon and pirimiphos-methyl. respectively. The vege‌tative parts did not have any detectable residues of diazinon and pirimi‌phos-methyl after 12 & 16 days from application, respectively. No detectable residues of diazinon or pirimiphos-methyl residues were found in the roots during the days of the experiments. Diazinon and pirimiphos‌methyl were found to be shorting persistent in the vegetative parts, but they were more stable in the soil. The vegetative parts could be used safely in animal feeding after one day from treatment. Also, the roots of sugar beet could be used safely in sugar industry.