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Ciência Rural

Print version ISSN 0103-8478

Abstract

CERDEIRA, Antonio Luiz et al. Estimation of herbicide bioconcentration in sugarcane (Saccharum officinarum L.). Cienc. Rural [online]. 2015, vol.45, n.4, pp.591-597. ISSN 0103-8478.  http://dx.doi.org/10.1590/0103-8478cr20120466.

Sugarcane is an important crop for sugar and biofuel production in Brazil. Growers depend greatly on herbicides to produce it. This experiment used herbicide physical-chemical and sugarcane plant physiological properties to simulate herbicide uptake and estimate the bioconcentration factor (BCF). The (BCF) was calculated for the steady state chemical equilibrium between the plant herbicide concentration and soil solution. Plant-water partition coefficient (sugarcane bagasse-water partition coefficient), herbicide dilution rate, metabolism and dissipation in the soil-plant system, as well as total plant biomass factors were used. In addition, we added Tebuthiuron at rate of 5.0kg a.i. ha-1 to physically test the model. In conclusion, the model showed the following ranking of herbicide uptake: sulfentrazone > picloram >tebuthiuron > hexazinone > metribuzin > simazine > ametryn > diuron > clomazone > acetochlor. Furthermore, the highest BCF herbicides showed higher Groundwater Ubiquity Score (GUS) index indicating high leaching potential. We did not find tebuthiuron in plants after three months of herbicide application

Keywords : herbicide; bioconcentration factor; plant uptake; model; bagasse adsorption.

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