Developed a cutting unit connected with rice harvesting combine machine, received the straw, cutoff and regularity distributed on soil surface to profit it as a source of organic manure direct in soil is the aim of this study. It is concluded that increasing the cutting speed and decreasing the rice straw moisture content recorded the shortest straw cutting length and suitable cutting straw distribution on the harvesting area. Furthermore, the cutting unit operation increased the fuel consumption not more about 4% than the fuel consumption of rice harvesting combine machine.