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Impact of Imazamox and Imazapyr carryover on wheat, barley, and oat

Colaborador(es): Scursoni, Julio Alejandro. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Producción Vegetal. Buenos Aires, Argentina | Montoya, Jorgelina C. Instituto Nacional de Tecnología Agropecuaria (INTA). Centro Regional La Pampa – San Luis. Estación Experimental Agropecuaria Anguil (EEA Anguil). Anguil, La Pampa, Argentina | Vigna, Mario R. Instituto Nacional de Tecnología Agropecuaria (INTA). Centro Regional Buenos Aires Sur. Estación Experimental Agropecuaria Bordenave (EEA Bordenave). Bordenave, Buenos Aires, Argentina | Gigón, Ramón. Instituto Nacional de Tecnología Agropecuaria (INTA). Centro Regional Buenos Aires Sur. Estación Experimental Agropecuaria Integrada Barrow (EEA Barrow). Tres Arroyos, Buenos Aires, Argentina | Istilart, Carolina M. Instituto Nacional de Tecnología Agropecuaria (INTA). Centro Regional Buenos Aires Sur. Estación Experimental Agropecuaria Integrada Barrow (EEA Barrow). Tres Arroyos, Buenos Aires, Argentina | Renzi Pugni, Juan P. Instituto Nacional de Tecnología Agropecuaria (INTA). Centro Regional Buenos Aires Sur. Estación Experimental Agropecuaria Hilario Ascasubi (EEA Hilario Ascasubi). Hilario Ascasubi, Buenos Aires, Argentina | López, Ricardo. Instituto Nacional de Tecnología Agropecuaria (INTA). Centro Regional Buenos Aires Sur. Estación Experimental Agropecuaria Bordenave (EEA Bordenave). Bordenave, Buenos Aires, Argentina | Porfiri, C. Instituto Nacional de Tecnología Agropecuaria (INTA). Centro Regional La Pampa – San Luis. Estación Experimental Agropecuaria Anguil (EEA Anguil). Anguil, La Pampa, Argentina.
ISSN: 1550-2740.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): IMIDAZOLINONE HERBICIDES | CARRYOVER | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR En: Weed technology Vol.31, no.6 (2017), p.838–846, tbls.Resumen: Imazapyr and imazamox are frequently applied postemergence to control grass and broadleaf weeds in imidazolinone-resistant sunflower in Argentina. Herbicide carryover to rotational crops represents a disadvantage of these herbicides, particularly in regions with low rainfall during the months prior to rotational crop sowing. Between 2009 and 2012, field and greenhouse studies were conducted on four important sunflower-cropped areas of Argentina. The objective was to quantify the effects of imazapyr alone and imazamox plus imazapyr applied in sunflower crops on the subsequent establishment, growth, and yield of barley, oat, and wheat. In all field experiments, imazapyr alone and imazamox plus imazapyr were applied at recommended rates (80 g ha–1 and 66 plus 30 g ha–1, respectively), and also, in some experiments, at double the recommended rates. Soil bioassays were also conducted in the greenhouse to study the effect of these herbicides on barley, oat, and wheat seedlings. The mixture of imazamox plus imazapyr was safer for rotational crops than imazapyr applied alone, because of the reduced rate of imazapyr in the mixture treatments. Barley was more sensitive to imidazolinones, particularly imazapyr, than the other winter cereals. Imazapyr at double rate (160 g ha–1) reduced barley yield by 45% when seeds were sown 165 d after herbicide application and with 240mm rainfall after herbicide application.
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Imazapyr and imazamox are frequently applied postemergence to control grass and broadleaf weeds in imidazolinone-resistant sunflower in Argentina. Herbicide carryover to rotational crops represents a disadvantage of these herbicides, particularly in regions with low rainfall during the months prior to rotational crop sowing. Between 2009 and 2012, field and greenhouse studies were conducted on four important sunflower-cropped areas of Argentina. The objective was to quantify the effects of imazapyr alone and imazamox plus imazapyr applied in sunflower crops on the subsequent establishment, growth, and yield of barley, oat, and wheat. In all field experiments, imazapyr alone and imazamox plus imazapyr were applied at recommended rates (80 g ha–1 and 66 plus 30 g ha–1, respectively), and also, in some experiments, at double the recommended rates. Soil bioassays were also conducted in the greenhouse to study the effect of these herbicides on barley, oat, and wheat seedlings. The mixture of imazamox plus imazapyr was safer for rotational crops than imazapyr applied alone, because of the reduced rate of imazapyr in the mixture treatments. Barley was more sensitive to imidazolinones, particularly imazapyr, than the other winter cereals. Imazapyr at double rate (160 g ha–1) reduced barley yield by 45% when seeds were sown 165 d after herbicide application and with 240mm rainfall after herbicide application.

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