Controle de plantas daninhas e seletividade do herbicida falcon® em mudas de eucalipto
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Data
2022-06-21
Autores
Silva, Matheus Antonio Dias da
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Universidade Estadual Paulista (Unesp)
Resumo
O ensaio foi realizado na estação Experimental TechField, localizada no município de Botucatu,SP, no período de 25/10 a 24/12/2021 com a finalidade de avaliar a eficácia e praticabilidade agronômica do herbicida Falcon® (piroxasulfona + flumioxazina), aplicado em pré-emergência das plantas daninhas e pós-emêrgencia de eucalipto. As mudas de eucalipto, clone I-144, foram plantadas em 25/10/2021, em espaçamento de 3,0 m x 1,5 m. Utilizou-se o delineamento experimental em blocos inteiramente casualizados, com seis tratamentos e quatro repetições, sendo assim distribuídos: 1) piroxasulfona + flumioxazina (93,75 mL p.c. ha-1), 2) piroxasulfona + flumioxazina (187,5 mL p.c. ha-1), 3) piroxasulfona + flumioxazina (375 mL p.c. ha-1), 4) piroxasulfona + flumioxazina (750 mL p.c. ha-1), 5) piroxasulfona + flumioxazina (1500 mL p.c. ha-1) e 6) Testemunha sem aplicação. A aplicação dos tratamentos, ocorreu no dia 12/11/2021, com auxílio de um pulverizador costal pressurizado com CO2, munido de barra composta por duas pontas AVI 110.02, espaçadas em 0,5 m entre si, a uma pressão de 1.8 kgf cm-2, proporcionando um consumo de calda equivalente a 200 L ha-1. As avaliações de eficácia dos tratamentos no controle das espécies de plantas daninhas foram realizadas aos 7 dias após aplicação, 14, 21, 28, 35 e 42(DAA). Nestas mesmas datas, foram avaliados os possíveis efeitos de sintomas fitotóxicos sobre a cultura do eucalipto. As medições de altura e diâmetro do colmo das plantas de eucalipto nas parcelas experimentais foram realizadas no início (0 DAA) e aos 90 DAA. De acordo com os resultados obtidos, as médias de eficácia de controle das espécies daninhas Brachiaria decumbens e Merremia aegyptia, foram consideradas muito boas a excelentes. Foi observado efeitos de sintomas visuais de fitointoxicação na cultura do eucalipto, na dose comercial recomendada e a dosagem duas vezes a dose comercial recomendada. Não foram observadas diferenças estatísticas nas avaliações de altura da cultura do eucalipto, que pudessem ser atribuídos à aplicação, das diferentes dosagens avaliadas do herbicida Falcon®.
The experiment was carried out at the Experimental TechField station, located in the city of Botucatu, SP, from 10/25 to 12/24/2021 in order to evaluate the effectiveness and agronomic practicability of the Falcon® herbicide (pyroxasulfone + flumioxazine), applied in pre-emergence of weeds and post-emergence of eucalyptus. The eucalyptus seedlings, clone I-144, were planted on 10/25/2021, in a spacing of 3.0 m x 1.5 m. A completely randomized block design was used, with six treatments and four replications, distributed as follows: 1) pyroxasulfone + flumioxazin (93.75 mL p.c. ha-1), 2) pyroxasulfone + flumioxazin (187.5 mL p.c. ha-1) -1), 3) pyroxasulfone + flumioxazin (375 ml p.c. ha-1), 4) pyroxasulfone + flumioxazin (750 ml p.c. ha-1), 5) pyroxasulfone + flumioxazin (1500 ml p.c. ha-1) and 6) Control without application. The treatments were applied on 11/12/2021, with the aid of a backpack sprayer pressurized with CO2, equipped with a bar composed of two AVI 110.02 tips, spaced 0.5 m apart, at a pressure of 1.8 kgf cm. -2, providing a solution consumption equivalent to 200 L ha-1. Efficacy assessments of treatments in controlling weed species were performed at 7 days after application, 14, 21, 28, 35 and 42 (DAA). On these same dates, the possible effects of phytotoxic symptoms on the eucalyptus crop were evaluated. Measurements of height and stem diameter of eucalyptus plants in the experimental plots were performed at baseline (0 DAA) and at 90 DAA. According to the results obtained, the means of control effectiveness of the weed species Brachiaria decumbens and Merremia aegyptia were considered very good to excellent. Effects of visual symptoms of phytotoxicity were observed in the eucalyptus crop, at the recommended commercial dose and at twice the recommended commercial dose. No statistical differences were observed in the evaluations of height of the eucalyptus crop, which could be attributed to the application of the different evaluated doses of the Falcon® herbicide.
The experiment was carried out at the Experimental TechField station, located in the city of Botucatu, SP, from 10/25 to 12/24/2021 in order to evaluate the effectiveness and agronomic practicability of the Falcon® herbicide (pyroxasulfone + flumioxazine), applied in pre-emergence of weeds and post-emergence of eucalyptus. The eucalyptus seedlings, clone I-144, were planted on 10/25/2021, in a spacing of 3.0 m x 1.5 m. A completely randomized block design was used, with six treatments and four replications, distributed as follows: 1) pyroxasulfone + flumioxazin (93.75 mL p.c. ha-1), 2) pyroxasulfone + flumioxazin (187.5 mL p.c. ha-1) -1), 3) pyroxasulfone + flumioxazin (375 ml p.c. ha-1), 4) pyroxasulfone + flumioxazin (750 ml p.c. ha-1), 5) pyroxasulfone + flumioxazin (1500 ml p.c. ha-1) and 6) Control without application. The treatments were applied on 11/12/2021, with the aid of a backpack sprayer pressurized with CO2, equipped with a bar composed of two AVI 110.02 tips, spaced 0.5 m apart, at a pressure of 1.8 kgf cm. -2, providing a solution consumption equivalent to 200 L ha-1. Efficacy assessments of treatments in controlling weed species were performed at 7 days after application, 14, 21, 28, 35 and 42 (DAA). On these same dates, the possible effects of phytotoxic symptoms on the eucalyptus crop were evaluated. Measurements of height and stem diameter of eucalyptus plants in the experimental plots were performed at baseline (0 DAA) and at 90 DAA. According to the results obtained, the means of control effectiveness of the weed species Brachiaria decumbens and Merremia aegyptia were considered very good to excellent. Effects of visual symptoms of phytotoxicity were observed in the eucalyptus crop, at the recommended commercial dose and at twice the recommended commercial dose. No statistical differences were observed in the evaluations of height of the eucalyptus crop, which could be attributed to the application of the different evaluated doses of the Falcon® herbicide.
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Palavras-chave
Reflorestamento, Pré-emergência, Eficácia, Fitotoxicidade, Reflorestation, Pre-emergence, Efficacy, Phytotoxicity