Mixture of herbicides in peanut crops

Abstract

The mixture of herbicides in agricultural crops is a weed management strategy that has been
employed for many years throughout the country. However, it is a practice that was recently
regulated, so it has often been employed indiscriminately and inappropriately. Therefore, this work aimed to evaluate the selectivity of herbicide mixtures applied in pre-emergence on the
peanut crop, cultivate Granoleic. The experimental design was in randomized blocks, with 13
mixtures of herbicides applied in pre-emergence and a control (without chemical treatment),
with 4 repetitions. Throughout the experimental period, weekly evaluations of peanut
intoxication were performed from 7 to 84 days after application of the mixtures. At the end of
the peanut cycle (140 days after sowing) pod productivity was determined and the data
extrapolated to kg ha-1. The results were submitted to variance analysis using the F test, and
the means were compared using the Tukey test at 5% probability. Among the treatments and
parameters evaluated, it was found that the mixtures of flumioxazin + chlorimuron,
sulfentrazone + imazetapyr and sulfentrazone + clomazone provided significant reductions of
all parameters. In possession of the results raised in this study, it was concluded that the
mixture of the herbicides diclosulan + s-metolachlor, diclosulan + trifluralin, diclosulan +
imazetapir, flumioxazin + imazetapir and flumioxazin + imazapic is selective for peanut crop. At
the doses, soil type and edaphoclimatic conditions studied, the mixtures of flumioxazin +
trifluralin. flumioxazin + s-metolachlor, fomesafen + s-metolachlor, diclosulan + imazapic,
imazetapir + flumioxazin, sulfentrazone + imazetapir, flumioxazin + chlorimuron and
sulfentrazone + clomazone are not selective for the crop, and may cause losses of up to 56% in
peanut productivity.