Estimation of herbicide bioconcentration in sugarcane (Saccharum officinarum L.)

Ciência Rural

Antonio Luiz Cerdeira¹  Lourival Costa Paraíba¹  Sonia Claudia Nascimento De Queiroz¹  Marcus Barifouse Matallo¹  Daniel Andrade De Siqueira Franco¹  Vera Lúcia Ferracini¹ 

关键词: herbicide;    bioconcentration factor;    plant uptake;    model;    bagasse adsorption;    herbicida;    fator de bioconcentração;    absorção;    estimativa;    adsorção bagaço;   

DOI  :  10.1590/0103-8478cr20120466

来源: SciELO

【 摘 要 】

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

【 授权许可】

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