1Unidad de Sanidad Vegetal, Centro de Investigación y Tecnología Agroalimentaria (CITA), Avda. Montañana 930, 50059 Zaragoza, Spain; email@example.com;
3Universidad de Zaragoza. Escuela Politécnica Superior, Ctra. de Cuarte s/n, 22071 Huesca, España. firstname.lastname@example.org
Purple nutsedge (Cyperus rotundus L.) is a serious weed capable to pierce polyethylene (PE) plastic mulch used in horticulture. A biodegradable plastic, PE and five different papers were tested 2 years each in drip irrigated processing tomato fields highly-infested with C. rotundus from 2005 to 2010 in Zaragoza (Spain). Three papers were brown, two were black; the density of the papers ranged between 50 and 200 g/m2; some papers were made out of recycled fibers, others were made directly out of wood fibers. All five papers were able to withstand C. rotundus and the other weed species. Most C. rotundus plants emerged from the biodegradable plastic mulch possibly because this material had lowest strength to withstand slow perforation. Commercial paper used as mulch without any special additives can satisfactorily control C. rotundus in processing tomato provided that climate is appropriate to maintain the paper dry during most of the time.