نوع مقاله : مقاله پژوهشی
نویسندگان
مؤسسه تحقیقات برنج کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، رشت، ایران.
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
The diversity of weed communities and their differenes in response to herbicides have made mixed herbicides application inevitable. In this research, the efficacy of transplanted rice herbicides in controlling weeds in rice direct seeded rice was investigated. Comparison the efficiency of premixed herbicide pretilachlor + pyribenzoxim (solito, EC 32%, 480 g ai ha-1) in a pot experiment with the common herbicides bispyribac-sodium (two formulations SC40%, SC10%), pyribenzoxim and bentazone + MCPA showed that the premixed herbicide provided similar control of barnyardgrass and bulrush as did common herbicides. Field experiment treatments included bentazone + MCPA + pendimethalin, bentazone + MCPA + thiobencarb, bispyribac-sodium + pendimethalin, bispyribac-sodium + thiobencarb, pretilachlor + bensulfuron-methyl and doses of 0, 50, 100, 150 and 200% of pretilachlor + pyribenzoxim mixed with thiobencarb. The results showed that pretilachlor + pyribenzoxim did not show any phytotoxicity symptoms on rice up to twice the recommended dose. Application of the recommended dose of pretilachlor + pyribenzoxim + thiobencarb provided 90% and 70% control of barnyardgrass (Echinochloa crus galli) and bulrush (Bolboschoenus planiculmis) respectively. The lowest and highest yield of paddy was 517 and 5495 kg/ha, respectively, which was recorded in the weedy and bispyribac-sodium + thiobencarb treatments. The yield of paddy at the recommended and twice the recommended dose of pretilachlor + pyribenzoxim was statistically same 4761 and 4827 kg/ha, respectively. Overall, the results of this research indicated that the application of pretilachlor+pyribenzoxim (480 g ai ha-1) after soil-applied thiobencarb (2750 g ai ha-1) provided very good control on the important weeds of rice in direct cultivation on wet bed and can be introduced as a suitable alternative to common herbicides.
کلیدواژهها [English]
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