Integration of cultural practices and low doses of herbicides in post-emergence application for weed control in soybean Merrill I Effects of the plant development of weed control

Rassini, J.B.; Durigan, J.C.

Cientifica (Jaboticabal) 20(2): 279-286


ISSN/ISBN: 0100-0039
Accession: 031973191

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The objetive of the experiment was to determine the behaviour of two soybean cultivars, seeded in two row spacings, to complement weed control through herbicides doses smaller than those indicated for soybean, in post-emergence application. The experiment was carried out in a Distrofic Dark Red Latosol located at the experimental area of the UNESP, Campus of Jaboticabal, Sao Paulo State, Brazil. The experimental design used was the split-split plot with four replications, testing the IAC-8 and Foscarin soybean cultivars, in two row spacings (30 cm end 60 cm), and 25% and 50% doses reductions of lactofen, fomesafen and haloxyfop-methyl, applied alone or in the following mixtures: lactofen + haloxyfop-methyl and fomesafen + haloxyfop-methyl. The following conclusions were obtained: a) the 30 cm row spacing resulted in an early shadowing of the soil when compared to the 60 cm spacing, mainly for the IAC-8 cultivar, resulting in better complementary weed control by the herbicides at the used doses; b) there were no significant differences in weed control using 25% or 50% reduced doses of lactofen and fomesafen alone or in mixtures with haloxyfop-methyl, being both treatments better than haloxyfop-methyl.