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portuguesO objetivo deste trabalho foi avaliar a interacao entre herbicidas associados ao saflufenacil para o controle de capim-arroz e a determinacao do efeito dos herbicidas sobre os parâmetros fotossinteticos e de fluorescencia de clorofila. O experimento foi conduzido em casa de vegetacao em esquema fatorial 2x8, cujo fator A testou os biotipos resistente e suscetivel; e o fator B os herbicidas: saflufenacil (70 g i.a. ha-1), clomazone (180 g i.a. ha-1), imazapyr+imazapic (73,5+24,5 g i.a. ha-1), cyhalofop (360 g i.a. ha-1), as associacoes desses com saflufenacil, e testemunha sem tratamento. Foi avaliado o controle aos 7, 14, 21 e 28 dias apos a aplicacao dos herbicidas (DAA), massa seca da parte aerea aos 28 DAA, avaliacao de parâmetros fotossinteticos com analisador de gas infravermelho (IRGA) e emissao de fluorescencia da clorofila a 24 e 48 horas apos aplicacao dos tratamentos, respectivamente, e interacao dos herbicidas. A associacao de saflufenacil com herbicidas testados na maior parte nao modificou a resposta dos herbicidas para o controle de capim-arroz em ambos os biotipos. O biotipo resistente apresentou menor efeito negativo nos processos de fluorescencia de clorofila e parâmetros de fotossintese na associacao de herbicidas com saflufenacil. O herbicida cyhalofop associado ao saflufenacil demonstra ser eficiente para o controle de capim-arroz suscetivel e resistente a ALS. EnglishThe objectives of this research were to evaluate the interaction between herbicides mixed with saflufenacil for the control of barnyardgrass and to determine the effect on photosynthetic and chlorophyll fluorescence parameters. The experiment was conducted in a greenhouse in a 2x8 factorial scheme, whose factor A tested resistant and susceptible biotypes; and factor B the herbicides: saflufenacil (70 g a.i. ha-1), clomazone (180 g a.i. ha-1), imazapyr + imazapic (73.5 + 24.5 g a.i. ha-1), and cyhalofop (360 g a.i. ha-1), the mixtures of these herbicides with saflufenacil, and control without treatment. Weed control was assessed 7, 14, 21 and 28 days after herbicide application (DAA), as well as shoot dry matter at 28 DAA, photosynthetic parameters using infrared gas analyzer (IRGA), and emission of chlorophyll a fluorescence after 24 and 28 hours of application of treatments, respectively, and interaction of herbicides. Combination of saflufenacil with the herbicides tested in general did not change the response of both barnyardgrass biotypes to the herbicides used. The resistant biotype showed a lower negative effect on chlorophyll fluorescence and photosynthesis parameters in the combination of herbicides with saflufenacil. The herbicide cyhalofop was effective for the control of ALS-susceptible and resistant barnyardgrass.

Barnyardgrass control using tank-mixed herbicides with saflufenacil and its influence in photosynthesis and chlorophyll fluorescence