The comparative study of reduced tillage, zero tillage and conventional tillage conducted during 5 years in the sub-humid zone of Algeria showed a difference of the development of durum wheat and changes of some soil characteristics. In the first year experiment, the yield was higher in the conventional tillage compared with reduced tillage and no-tillage. After the 3rd year, better yields were obtained with no-till with a 10 q/ha rise compared with conventional tillage. This confirms that the production of wheat under no till is improved year by year. However, after the 5th year of experiment, the high soil moisture at the seeding has generated lower yields. The different tillage practices have generated differences in soil characteristics. In fact a better water retention and a better content in organic matter in the three studied layers, were observed with no till. The bulk density shows a clear variation at the surface layer (0-8 cm) with the highest density in the conventional tillage.
