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Planta Daninha

Print version ISSN 0100-8358

Abstract

DAN, H.A et al. Effect of the residual activity of herbicides applied in post-emergence soybean on pearl millet grown in succession. Planta daninha [online]. 2011, vol.29, n.3, pp. 663-671. ISSN 0100-8358.  http://dx.doi.org/10.1590/S0100-83582011000300021.

The objective of this study was to evaluate the residual activity of herbicides used in post-emergence soybean on Pearl Millet grown in succession. The experiment was conducted in clay soil in cerrado region. The herbicides chlorimuron-ethyl (0.015 kg ha-1), imazethapyr (0.060 kg ha -1), imazethapyr (0.100 kg ha-1) and fomesafen (0.250 kg ha-1) were used in post-emergence soybean cultivar Msoy-6101, in plots of 80 m2 that were subdivided into sub-plots of 20 m2 (5 x 4 m). A randomized block design with four replications was used in a split plot scheme 5 x 4. Pearl millet hybrid ADR-7010 was sown in the sub-plots in four periods after herbicide application, corresponding to 0, 40, 80 and 120 days after herbicide application (DAA). Pearl Millet injuries were evaluated at 7 and 28 days after emergence, together with stand, height and dry biomass of plant, as well as crop grain yield. Imazethapyr (0.060 kg ha-1) and chlorimuron-ethyl (0.015 kg ha-1) did not significantly affect crop yield in sowing after 80 DAA. As for the herbicide fomesafen, the minimum period between application and sowing of the crop was 100 days. Greater persistence was observed for imazethapyr (0.100 kg ha-1), reaching 120 days of bioactivity on Pearl Millet, which had its performance affected even when sown during this period.

Keywords : Carryover; Pennisetum glaucum; chlorimuron-ethyl; imazethapyr; fomesafen; Pennisetum glaucum.

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