OCORRÊNCIA DE AGROTÓXICOS EM ÁGUAS USADAS COM IRRIGAÇÃO DE ARROZ NO SUL DE SANTA CATARINA

Álvaro José Back; Francisco Carlos Deschamps; Maria da Gloria da Silva Santos

doi:10.5327/Z2176-9478201611014

Authors

Álvaro José Back Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina (Epagri)
Francisco Carlos Deschamps Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina (Epagri)
Maria da Gloria da Silva Santos Universidade do Extremo Sul Catarinense (UNESC)

DOI:

https://doi.org/10.5327/Z2176-9478201611014

Keywords:

arroz irrigado; qualidade da água; agroquímicos; herbicidas.

Abstract

This study aimed to evaluate the presence of pesticide residues in surface water drainage from irrigated rice fields in pre-germinated system in southern Santa Catarina, Brazil. We analyzed water samples collected in the irrigation canals and drainage system of a multiuser irrigation system during three growing seasons. Carbofuran residues were found in samples of drainage water collected in the three years of monitoring, with concentrations up to 5 μg.L-1. The majority (81%) of surface water samples from drainage areas of irrigated rice fields contained residues of at least 1 herbicide. Among the herbicides, bentazone had the highest frequency (50%), however, residues of bispyribac-sodium, quinclorac and thiobencarb were also found. Among the fungicides, tryciclazole, azoxystrobin and tebuonazol were seen. Residues of the insecticide Malathion were detected in 5.2% of the samples, but at concentrations below the detection limit.