TY - SER AU - Marchesan,E. AU - Zanella,R. AU - Avila,L.A.de AU - Camargo,E.R. AU - Machado,S.L.de O. AU - Macedo,V.R.M. TI - Rice herbicide monitoring in two brazilian rivers during the rice growing season KW - ARROZ KW - HERBICIDA KW - POLUIÇÃO KW - IMPACTO AMBIENTAL ER -