The objective of this work was to evaluate soybean oversowing with Urochloa ruziziensis, for the soybean capacity of dry mass production, for weed infestation, and corn crop development under no-tillage system. The experiment was carried out in a randomized complete block design, with four replicates, in a 2 x 5 + 1 factorial arrangement. Oversowing with U. ruziziensis was evaluated in two soybean growth stages (R-6 and R-8) and five seed quantities: 200, 400, 600, 800, and 1,000 points of cultural value (PCV). For control, a treatment without oversowing was kept. Oversowing of 200 PCV of U. ruziziensis, at the R-6 or R-8 soybean stages, results in a sufficient straw quantity for no-tillage system, and favors weed control in the rotation corn crop. However, in high amounts, U. ruziziensis straw over the soil affects corn plant height and grain production.