Experiments were carried out at the research farm of the Rice Mechanization Center, Meet El-Dyba, Kafr El-Sheikh Governorate during the summer season of 1996/97. The present study showed the effect of three turning plows on the plowing and inversion degrees of soil and indicated the effect of K-ratio (share width/plowing depth) on inversion degree at four levels of soil moisture contents, plowing speeds and plow­ing depths under local prevailing conditions. The results showed that the maximum degrees of soil plowing were 28.30, 24.73 and 30.2% for disc, modified moldboard and mold­board plows, respectively, at plowing depths of 25.31, 18.28 and 26.46cm and plowing speed of 5.37 km/h. The maximum values of soil inversion degrees were found to be 40.63, 43.75 and 68.75% for these plows, respectively, at plowing speed of 2.18km/h, plowing depth of 27.43, 19.81 and 28.32 cm, respectively and soil moisture content of 19.98%. Whilst the minimum values of 30.2, 28.9 and 45.2% were ob­tained with the same plows at plowing depth of 8.1, 8.4 and 7.5cm, re­spectively, and soil moisture content of 16.81% and plowing speed of 5.37km/h. The k-ratios of 1.13, 1.21 and 1.42 gave the maximum inversion degrees with plowing depths of 27.31, 19.81 and 28.32cm, respective­ly, at plowing speed of 2.18 km/h and soil moisture content of 19.98%.