engleski

Effects of soil tillage and post-emergence herbicides on weed control and yield of winter wheat

Field trials were conducted in winter wheat during 2008-2011 in north-eastern Croatia to evaluate the effects of two continuous tillage systems (conventional with mouldboard ploughing-CT & reduced with disk harrowing-RT)) and post-emergence chemical weed control upon species composition, weed density and crop yield. In both tillage systems the main weeds were annual species, grass of Apera spica-venti (L.) PB. and broad-leaved weeds of Matricaria inodora L., Papaver rhoeas L. and Viola arvensis Murray. Weed density on untreated plots was lower in CT tillage (26.4 plants m-2) than in RT tillage (40.2 plants m-2). The best total weed control was achieved with iodsulfuron-methylsodium (97.3%), followed by the herbicide combinations of prosulfocarb plus triasulfuron (96.7%), triasulfuron plus pinoxaden (95.3%), standard tank mixture of triasulfuron + chlortoluron (93.8%) and prosulfocarb (88.3%). Compared to the highest yield with disk harrowing (6659 kg ha-1) average percent yield depression with mouldboard ploughing was 5%. Among the herbicide variants, significant yield depression (3%) was observed only when prosulfocarb was applied alone.

soil tillage ; weed density ; chemical weed control ; crop yield

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