In this study, straw was incorporated into different soil depth and then soil CO2 emission was recorded for 45 days after the tillage operation. For this purpose, four treatments were investigated as bare soil surface (A), straw incorporated into 5 cm soil depth (B), straw incorporated into 10 cm soil depth (C), straw spreaded at the soil surface (D). Approximately, 0.5 kg straw was used per square meter. Soil carbon dioxide emission was recorded by mobile soil CO2 flux system. Concomitantly, soil temperature, soil water evaporation and soil moisture was recorded.