Chemical control of signalgrass in alfalfa crops
The use of herbicides to control grass in Medicago sativa (alfalfa) pastures is still incipient. Therefore, the objective of this study was to evaluate the efficiency of fluazifop-p-butyl in the control of Brachiaria decumbens (signalgrass) in alfalfa. Thus, randomized block design was used, with se...
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Universidade Estadual de Londrina
2017-11-01
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doaj-e5d879af1dd44b9891dec42a6c1a78962020-11-25T00:08:45ZengUniversidade Estadual de LondrinaSemina: Ciências Agrárias1676-546X1679-03592017-11-013863695370410.5433/1679-0359.2017v38n6p369516465Chemical control of signalgrass in alfalfa cropsRenan Coelho Dias0Márcia Vitória Santos1Fabiana Lopes Ramos de Oliveira2Evander Alves Ferreira3José Barbosa dos Santos4Bárbara Martins Rodrigues5Cézar Augusto Martins6Universidade Federal dos Vales do Jequitinhonha e MucuriUniversidade Federal dos Vales do Jequitinhonha e MucuriUniversidade Federal dos Vales do Jequitinhonha e MucuriUniversidade Federal dos Vales do Jequitinhonha e MucuriUniversidade Federal dos Vales do Jequitinhonha e MucuriUniversidade Federal dos Vales do Jequitinhonha e Mucuri.Universidade Federal dos Vales do Jequitinhonha e Mucuri.The use of herbicides to control grass in Medicago sativa (alfalfa) pastures is still incipient. Therefore, the objective of this study was to evaluate the efficiency of fluazifop-p-butyl in the control of Brachiaria decumbens (signalgrass) in alfalfa. Thus, randomized block design was used, with seven doses of fluazifop-p-butyl (0, 25, 50, 100, 200, 300, 400 g ha-1), and four replications. Herbicide application was performed when the plants had about 20 cm height. Chlorophyll fluorescence, control of signalgrass and alfalfa toxicity were evaluated at 7, 15 e 30 days after application (DAA) and, at 45 DAA and 45 days after cut (DAC), both species were cut and tiller density, as well as branches and dry matter of forage species, were determined. Fluazifop-p-butyl does not affect the integrity of the photosynthetic apparatus of alfalfa plants, due to high tolerance to this mechanism of action presented by dicotyledonous species. However, signalgrass had physiological variables negatively affected by the herbicide, indicating the presence of physiological stress, even at the lowest doses of the product. The dose of 50 g ha-1 of fluazifop-p-butyl is effective in controlling signalgrass, without causing physiological and growth damage in alfalfa plants.http://www.uel.br/revistas/uel/index.php/semagrarias/article/view/23498FotossínteseFluorescência da clorofila aFluazifop p-butilMedicago sativaTaxa de transporte de elétrons. |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Renan Coelho Dias Márcia Vitória Santos Fabiana Lopes Ramos de Oliveira Evander Alves Ferreira José Barbosa dos Santos Bárbara Martins Rodrigues Cézar Augusto Martins |
spellingShingle |
Renan Coelho Dias Márcia Vitória Santos Fabiana Lopes Ramos de Oliveira Evander Alves Ferreira José Barbosa dos Santos Bárbara Martins Rodrigues Cézar Augusto Martins Chemical control of signalgrass in alfalfa crops Semina: Ciências Agrárias Fotossíntese Fluorescência da clorofila a Fluazifop p-butil Medicago sativa Taxa de transporte de elétrons. |
author_facet |
Renan Coelho Dias Márcia Vitória Santos Fabiana Lopes Ramos de Oliveira Evander Alves Ferreira José Barbosa dos Santos Bárbara Martins Rodrigues Cézar Augusto Martins |
author_sort |
Renan Coelho Dias |
title |
Chemical control of signalgrass in alfalfa crops |
title_short |
Chemical control of signalgrass in alfalfa crops |
title_full |
Chemical control of signalgrass in alfalfa crops |
title_fullStr |
Chemical control of signalgrass in alfalfa crops |
title_full_unstemmed |
Chemical control of signalgrass in alfalfa crops |
title_sort |
chemical control of signalgrass in alfalfa crops |
publisher |
Universidade Estadual de Londrina |
series |
Semina: Ciências Agrárias |
issn |
1676-546X 1679-0359 |
publishDate |
2017-11-01 |
description |
The use of herbicides to control grass in Medicago sativa (alfalfa) pastures is still incipient. Therefore, the objective of this study was to evaluate the efficiency of fluazifop-p-butyl in the control of Brachiaria decumbens (signalgrass) in alfalfa. Thus, randomized block design was used, with seven doses of fluazifop-p-butyl (0, 25, 50, 100, 200, 300, 400 g ha-1), and four replications. Herbicide application was performed when the plants had about 20 cm height. Chlorophyll fluorescence, control of signalgrass and alfalfa toxicity were evaluated at 7, 15 e 30 days after application (DAA) and, at 45 DAA and 45 days after cut (DAC), both species were cut and tiller density, as well as branches and dry matter of forage species, were determined. Fluazifop-p-butyl does not affect the integrity of the photosynthetic apparatus of alfalfa plants, due to high tolerance to this mechanism of action presented by dicotyledonous species. However, signalgrass had physiological variables negatively affected by the herbicide, indicating the presence of physiological stress, even at the lowest doses of the product. The dose of 50 g ha-1 of fluazifop-p-butyl is effective in controlling signalgrass, without causing physiological and growth damage in alfalfa plants. |
topic |
Fotossíntese Fluorescência da clorofila a Fluazifop p-butil Medicago sativa Taxa de transporte de elétrons. |
url |
http://www.uel.br/revistas/uel/index.php/semagrarias/article/view/23498 |
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