عنوان مقاله [English]
This experiment was conducted to study the residual effect of some wheat herbicides on following corn (Zea mays L.) crop under different tillage systems in Karaj province. Tillage treatments included: conventional tillage, minimum tillage and, no-tillage. Herbicide treatments were: 1- bromoxynil + MCPA (EC 40%) 1.5 lit/ha, 2- triasulfuron + dicamba (WG 70%) 150 gr/ha, 3- mesosulfuron-methyl + iodosulfuron-methyl-sodium (62 WG) 400 gr/ha, 4- metsulfuron methyl + sulfosulfuron (w/v %5+75WG) 36 gr/ha, 5- tribenuron methyl (EC 8%) + clodinafop propargyl (DF 75%) 20 gr/ha and 0.8 lit/ha respectively, as well as unweeded control (without herbicide). Soil sampling for bioassay tests made from surface layer (0-12.5 cm) and, sub-surface layer (12.5-25 cm). Bioassay experiment was conducted with Cress (Lepidium sativum) as a test plant and corn. Cress emergence percentage and cress and corn dry matter and height was assessed. Results indicated that herbicide bio- availability was depended on tillage system; in fact herbicide bio-availability was minimum in no-tillage systems. Triasulfuron + dicamba, mesosulfuron-methyl + iodosulfuron-methyl-sodium and metsulfuron methyl + sulfosulfuron were the most persistent herbicide based on bio-availability, respectively. Therefore, these herbicides may damage the following corn crop in rotation although, corn was more tolerant to metsulfuron methyl + sulfosulfuron. On the other hand, the persistence of bromoxynil + MCPA and tribenuron methyl + clodinafop propargyl herbicides in the soil was negligible and damage seems unlikely by theses herbicide in rotation.
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