Effect of glyphosate drift on marandu grass

Glyphosate drift in plants that are not resistant to the herbicide molecule can result stimulation certain biological features, characterizing phenomenon of hormesis. On this basis, productive and chemical traits were evaluated marandu grass, a simulation effect, using sublethal doses glyphosate. The experiment was laid out randomized-block design with split plots time, four replicates. effect glyphosate acid equivalent (a.e.) (21.60, 43.20, 64.80, 86.40 108.00 g ha-1) control plots; harvesting at 92, 113, 134 155 days after sowing (DAS) grass subplots. Urochloa brizantha cv. Marandu collected height 0.20 m, defoliation interval 21 days, estimate production traits, experimental usable area 7.5 m2. Leaf: stem ratio influenced by interaction between factors (dose harvest). Dose fitted second-order polynomial model, hormesis 21.60 76.50 ha-1 a.e. Harvesting DAS differed significantly from 92 DAS. forage yield showed linear response inversely proportional increasing doses. There increase leaf phosphorus content, up dose 72.50 ha-1. Harvest neutral detergent fiber, lignin contents.