Mature seeds of the weeds common ragweed (Portulaca oleracea L.), Italian ryegrass (Lolium multiflorum Lam.), and barnyardgrass (Echinochloa crus-galli (L.) Beauv.) were purchased from Herbiseed (website: www.herbiseed.com), and those of pampas grass (Cortaderia selloana (Schult. & Schult. f.) Asch. & Graebn.) and tree tobacco (Nicotiana glauca Graham) were supplied by the Botanical Garden of Valencia.
Mature seeds of the food crops “Muchamiel” tomato (Solanum lycopersicum L.) and cucumber (Cucumis sativus L.) were obtained from Intersemillas S.A. “Albufera-type” rice (Oryza sativa L.) seeds were acquired from Copsemar in Sueca (Valencia, Spain).
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