Efficacy of selected herbicides in the desiccation of three plant species for soil cover

Abstract

An experiment was carried out with the objective of evaluating the efficiency of selected herbicides in the desiccation of three plant species in Dourados (MS), Brazil, in 1995/96. A randomized block design was used in three plant species: black oat (Avena strigosa ), millet (Pennisetum typhoydes) and Brachiaria plantaginea, with four herbicides in three rates: paraquat (0.30, 0.40 and 0.60 kg/ha), glyphosate (0.72, 1.08 and 1,44 kg/ha), sulfosate (0.96, 1.44 and 1.92 kg/ha) and glyphosate+2,4-D (0.54+0.67, 0.54+1.0 and 0.54+1.34 kg/ha). The herbicides glyphosate, sulfosate and the mixture glyphosate+2,4-D were efficient to desiccate the three species in all doses. The plants of millet and Brachiaria plantaginea showed a re-growth after 36 days of the application of paraquat.