Abstract:
Weeds are characterized by occurring in unwanted places and interfering in man's interests and
causing multiple damage to agricultural crops. Among the weeds frequently found in Brazilian
agricultural areas, the species bittergrass (Digitaria insularis) and buva (Conyza bonariensis)
have great importance in agriculture due to the selection of biotypes resistant to the main
herbicide recommended, Glyphosate, with this it is necessary to study this herbicide associated
with other molecules. The objective of this study was to evaluate the effect of different
herbicides on the control of buva and bitter grass. The research was composed of two
experiments installed in aseparably, and the experimental design was used for both randomized
blocks (DBC), contained by 4 treatments and 3 replications. Experiment 1 was composed of
Treatments T1 without herbicide application, T2 with Glyphosate and T3 application with
Application of Glyphosate + Clethodim to evaluate the effect on bitter grass, and experiment 2
composed of 3 treatments being, T1 without herbicide application, T2 with Glyphosate
application, T3 with application of Glyphosate + Saflufenacil to verify the effect on Buva. The
experimental units were containers of plastic bags with a capacity of 10L, which were filled with
5 liters of the compound of a mixture of (70%) ravine land with (30%) tanned corral manure,
where the seedlings of two different weed species were planted. Herbicide applications occurred when weeds were in full vegetative development and evaluations were performed 7, 14 and 21
days after herbicide application, and the control was evaluated visually where 0% represented the
absence of apparent damage and 100% complete plant death. Then the data were submitted to
analysis of variance, and the means compared by the Tukey test at 5% probability by the
Software Sivar®. Thus, for the conditions of the present experiment, the treatments used can be
concluded that the application of the isolated Glyphosate or associated with the herbicide Select
are effective for the bitter grass, and for Buva, the use of isolated Glyphosate allows the same
control when mixed with the heat, but requires a longer period of time to result in the death of
the plant. |
