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On-line version ISSN 1806-9681
GALON, L. et al. Effect of herbicides on raw the matter quality of sugarcane genotypes. Planta daninha [online]. 2009, vol.27, n.3, pp. 555-562. ISSN 1806-9681. http://dx.doi.org/10.1590/S0100-83582009000300017.
The objective of this study was to evaluate the effects of ametryn, trifloxysulfuron-sodium and ametryn + trifloxysulfuron-sodium mix on the raw matter quality of sugarcane genotypes. The experiment was conducted in the field, in a Paleudult, using a split-plot design with four replications. The herbicides ametryn (2.000 g ha-1), trifloxysulfuron-sodium (22.5 g ha-1) and the commercial mixture of ametryn + trifloxysulfuron-sodium (1.463 + 37,0 g ha-1), applied in post initial emergence of the crop, plus a hoed control, were allocated in the plots. Ten sugarcane genotypes were arranged in the split-plots: RB72454, RB835486, RB855113, RB855156, RB867515, RB925211, RB925345, RB937570, RB947520 and SP80-1816. A harvest time, 430 days after planting, the following characteristics were assessed: total soluble-solids (Brix), broth purity, fiber, apparent sucrose and sugar and stem productivity, regarding the raw matter quality of the genotypes. To facilitate interpretation of the results, all the evaluated characteristics were converted into percentages in relation with the hoed control (no herbicide). Different herbicide effects on the genotypes were observed, with RB855156 and RB835486 presenting the lowest stem and sugar yield. Among the herbicides, trifloxysulfuron-sodium had the greatest influence on these characteristics. There was a decrease in stem and sugar yield in genotype RB855113 treated with the mixture (ametryn + trifloxysulfuron-sodium). None of the genotypes was affected by the herbicide ametryn, when applied alone.
Keywords : Saccharum spp.; ametryn; trifloxysulfuron-sodium; herbicide mixture.