The results of nine pre-emergence experiments involving fourteen herbicides used alone or in combination are reported. Herbicide effectiveness on sandy and clay soils was compared, and special attention was given to the degree of grass control. Alachlor treatments (Lasso) were consistently satisfactory, with a mixture of alachlor and atrazine (2 kg a.i. + 1 kg a.i./ha) being excellent. Sencor (...