Intensification of crop rotation affecting weed communities and the use of herbicides in the rolling Pampa por Elba B. de la Fuente, Fernando H. Oreja, Adriana E. Lenardis, Marianne Torcat Fuentes, Belén Agosti, Antonio Barrio, Santiago Barberis, Julieta Robredo, Alejandra Gil, Martín Marzetti, Eugenia Niccia