The soil tillage is one of the most important agricultural operations, when used crops which the root depends system directly from the physical conditions of the soil. Aiming higher soil conservation, the use of plants of covering becomes an alternative to the maintenance of soil moisture and aggregates, improving too, characteristics such as resistance to penetration. The objective of the present work was evaluate properties of the soil and cultivation of cassava on different tillages and plants of covering. The experiment was conducted in the western region of Parana in Latosol red eutrophic. The experimental design was completely randomized in split plot, and 6 main plots of soil management systems: disk plow, chisel plow and offset disk harrow (followed by an offset leveling) in the months of April and August. The sub-plots were formed by plants of covering oat, Forage turnip and Without crop. The tillages with disk plow and chisel plow in August showed greater depth of furrow and seed cuttings of cassavas. Behavior similar happened to the soil moisture of 10 to 20 cm for the disk plow and the chisel plow in August. The tillages did not influence the final population of plants, number of stems per plant and percentage of plants fall. For plants of covering, the oats presented biggest difference in the soil moisture from 0 to 10 cm.
