Publicação on-line; 25 ref.; 11 tables; 3 illus.; Summary (En)

ABSTRACT
Background: Information on the carryover of herbicides applied to the
destruction of cotton stalks, as well as the withdrawal period necessary to
prevent the development and productivity of the crop in succession from
being affected are limited in the literature.
Objective: The objective was to identify the carryover effect promoted by
herbicides used in the management of the destruction of cotton stalks and
to estimate the host free period for sowing soybean in succession.
Methods: Two individual experiments were conducted simultaneously, one
for single application and the other for sequential application of herbicide
treatments. The experiments were installed in a factorial scheme (15x5), in
a randomized block design with four replications. The first factor evaluated
was herbicide treatments and the second factor was five soybean sowing
times after application (0, 30, 60, 90 and 120 days). The herbicides used in
the treatments were 2,4-D, glyphosate, saflufenacil, [imazapic + imazapyr],
dicamba, fluroxypyr and sulfentrazone.
Results: As this work was conducted, the results provide a carryover
indicator. It is concluded that the single application and the sequential
application of the glyphosate + dicamba + saflufenacil treatment has great
carryover potential for soybean crops, with the host free period for sowing
the crop exceeding 120 days after application.
Conclusions: The treatments 2,4-D, 2,4-D + glyphosate, glyphosate +
saflufenacil + fluroxypyr had the lowest host free period intervals, even
when in sequential application. The treatment with application of 2,4-D
alone showed the lowest carryover potential for soybean.

Keywords:
residual activity
safety interval
synthetic auxins