An experiment was carried out for soybeans [Glycine max (L.) Merr.] cv. Ramson, under greenhouse conditions, to evaluate its growing responses to glyphosate [N-(phosphonomethyl) glycine] (GLY), a herbicide with hormonal action, in interaction with ferulic acid (4-hydroxy-3-methoxy-t-cinnamic acid) (FA), an allelopathic substance found in wheat straw under no-till plantings, which in combination could favour competition against weeds Doses of 0.00, 0.75, 1.50, 2.25 and 3.00 kg/ha of glyphosate and 0,75, 150, 225 and 300 ppm pf ferulic acid were used. A randomized block design in factorial 5x5, with four replications was used. Paper pots were filled with 1,0 kg of mixed soil (3:2 clay/sand), with two plants/pot. The duration of experiment was 22 days. Applications of FA and GLY caused etiolation of soybean shoots and decrease of root biomass. Increases of soybean shoot biomass observed for FA were red
Glycine max; no-till; mulch; allelopathy