The objective of this work was to evaluate the physiological and agronomic effects of
post-emergent herbicides on sweet potato crop. The experiment was conducted in the
LASPER experimental area of the Federal University of Tocantins, Palmas campus. Two
experiments were set up: in the field and in pots. In the field experiment, a randomized
complete block design (DBC) with one cultivar (Duda) was used, five treatments being:
control (weed), atrazine + S-metolachlor (3,5 L.ha-1), nicosulfuron , 25 f.ha-1),
fomesafem + fluazifop (1.8 L.ha-1 + 1 L.ha-1) and carfentrazone (0.75 L.ha-1) and four
replicates. For the experiment in pots, to the physiological analyzes, the factorial design
was 5x3 being: five treatments and three times (14, 21 and 27 DAA) with three
replications; for the agronomic analysis in pots, the experiment was designed in the field.
The means of the treatments were compared by the Tukey test at 5% probability. It was
observed that herbicide treatments significantly reduced to US, A, Ci in the periods of 24
and 48 HAA, whereas only treatment with carfetrazone dramatically reduced E and gs to
24 HAA in approximately 73 and 88% , respectively, relative to the control. The treatment
atrazine + S-metolachlor did not differentiate from the control, for most agronomic
parameters evaluated, mainly, Productivity (70.1 ton.ha-1); (17.72%) and ethanol
productivity (6,554 L.ha-1), showing that this herbicide can be used with selective
potential for sweet potato crop in control of broad-leaved plants in application postemergence
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