Abstract

VARGAS, Paul E.; DE GROOT, Walter  and  VANDECASTEELE, Carlo. CONTAMINACION DEL AGUA Y SUBSUELO POR EL USO DEL FLUROXIPIR METILHEPTIL ESTER EN CULTIVOS DE SOYA EN LA LOCALIDAD DE CHANÉ EN EL DEPARTAMENTO DE SANTA CRUZ. Rev. Bol. Quim [online]. 2005, vol.22, n.1, pp.43-51. ISSN 0250-5460.

Starane^® is a herbicide used massively in soybean production, its active ingredient is fluroxypyr methylhepthyl ester (FMHE). Soil samples were collected from locations in Santa Cruz and Cochabamba. The obtained K_d and K_oc values are 8 ml g^-1 and 401 ml g^-1. The infiltration tests applying 1.74 times the FMHE field dose rendered a recovery of less than 1% FMHE. FMHE was only found in the leachates of soils with gravel and high sand contents. Hight contents of organic matter and salts were associated with a bigger and smaller sorption of FMHE in soil, respectively. FMHE was detected in four rivers and one well in Santa Cruz.

Keywords : Herbicide; Starane; Santa Cruz; soybean; fluroxypyr methylhepthyl ester; intact soil; leaching; K_d; K_oc; sorption.