Abstract:O conhecimento das alterações na comunidade infestante provocado pelo manejo de plantas daninhas é importante para definição de estratégias eficientes para o controle destas. Realizou-se um experimento de campo para avaliar os efeitos do uso de herbicidas em diferentes alturas de barra na dinâmica de plantas daninhas e produtividade do feijoeiro. Adotou-se arranjo fatorial em esquema 3x4+1, constituído pela combinação de três herbicidas (fomesafen, fluazifop-p-butil e sua mistura) e quatro alturas de barras do… Show more
“…40, dated October 11, 2018(MAPA, 2019, the use of herbicides in tank mixing will be an increasingly used practice by producers, but lacking studies that prove the effectiveness of these mixtures over weed control, possible damage to crops of interest Pucci, L. F. et al 361 signalgrass (Urochloa decumbens), "falsa serralha" (Emilia fosbergii) and "estrelinha" (Melampodium perfoliatum), plants commonly found in coffee plantations and of greater abundance in the area. This evaluation was performed using a square of 0.5 x 0.5 m (0.25 m 2 ) that was randomly launched twice in a representative area of each plot and the target weeds were then identified and evaluated the percentage of control (Barcellos Júnior et al, 2016). At 30, 68 and 104 DAA were also evaluated the intoxication caused in plants, according to the grading scale proposed by the Brazilian Society of Weed Science (SBCPD, 1995), where 0% represents no injury to plants and 100%, total death.…”
Weed management in the pre-transplantation of coffee plants is an essential condition for the future success of the crop. Currently, the producer has few options to perform chemical management at this stage. Therefore, one of the solutions that is being used is the tank mixing of products proven efficient with new products on the market, such as indaziflam. The objective of this study is to know the selectivity of indaziflam, associated or not with oxyfluorfen, in coffee pre-planting and its effectiveness in weed control. Thus, the following treatments were tested in the field: indaziflam (25 g ha<sup>-1</sup> a.i.), indaziflam (50 g ha<sup>-1</sup> a.i.), oxyfluorfen (960 g ha<sup>-1</sup> a.i.), indaziflam (25 g ha<sup>-1</sup> a.i.) + oxyfluorfen (960 g ha<sup>-1</sup> a.i.), indaziflam (50 g ha<sup>-1</sup> a.i.) + oxyfluorfen (960 g ha<sup>-1</sup> a.i.), plus a weeded and a non-weeded control. All treatments caused low intoxication in the seedlings, but without impairing the development and orphological variables of the plants. The treatments were efficient in controlling the species <em>Bidens pilosa L</em>., <em>Commelina benghalensis</em> L., <em>Urochloa decumbens</em>, <em>Emilia fosbergii</em> and <em>Melampodium perfoliatum</em> until 68 days after application. At 104 days, it was observed that there was a reduction in the efficiency of the products. It is concluded that the associated use of indaziflam and oxyfluorfen does not cause intoxications capable of interfering with the development of coffee plants. The association of these herbicides or their isolated applications is efficient in the control of weeds in the pre-transplantation of coffee plants, and the choice of the best management strategy is dependent on the weed community present in each area.
“…40, dated October 11, 2018(MAPA, 2019, the use of herbicides in tank mixing will be an increasingly used practice by producers, but lacking studies that prove the effectiveness of these mixtures over weed control, possible damage to crops of interest Pucci, L. F. et al 361 signalgrass (Urochloa decumbens), "falsa serralha" (Emilia fosbergii) and "estrelinha" (Melampodium perfoliatum), plants commonly found in coffee plantations and of greater abundance in the area. This evaluation was performed using a square of 0.5 x 0.5 m (0.25 m 2 ) that was randomly launched twice in a representative area of each plot and the target weeds were then identified and evaluated the percentage of control (Barcellos Júnior et al, 2016). At 30, 68 and 104 DAA were also evaluated the intoxication caused in plants, according to the grading scale proposed by the Brazilian Society of Weed Science (SBCPD, 1995), where 0% represents no injury to plants and 100%, total death.…”
Weed management in the pre-transplantation of coffee plants is an essential condition for the future success of the crop. Currently, the producer has few options to perform chemical management at this stage. Therefore, one of the solutions that is being used is the tank mixing of products proven efficient with new products on the market, such as indaziflam. The objective of this study is to know the selectivity of indaziflam, associated or not with oxyfluorfen, in coffee pre-planting and its effectiveness in weed control. Thus, the following treatments were tested in the field: indaziflam (25 g ha<sup>-1</sup> a.i.), indaziflam (50 g ha<sup>-1</sup> a.i.), oxyfluorfen (960 g ha<sup>-1</sup> a.i.), indaziflam (25 g ha<sup>-1</sup> a.i.) + oxyfluorfen (960 g ha<sup>-1</sup> a.i.), indaziflam (50 g ha<sup>-1</sup> a.i.) + oxyfluorfen (960 g ha<sup>-1</sup> a.i.), plus a weeded and a non-weeded control. All treatments caused low intoxication in the seedlings, but without impairing the development and orphological variables of the plants. The treatments were efficient in controlling the species <em>Bidens pilosa L</em>., <em>Commelina benghalensis</em> L., <em>Urochloa decumbens</em>, <em>Emilia fosbergii</em> and <em>Melampodium perfoliatum</em> until 68 days after application. At 104 days, it was observed that there was a reduction in the efficiency of the products. It is concluded that the associated use of indaziflam and oxyfluorfen does not cause intoxications capable of interfering with the development of coffee plants. The association of these herbicides or their isolated applications is efficient in the control of weeds in the pre-transplantation of coffee plants, and the choice of the best management strategy is dependent on the weed community present in each area.
RESUMODentre os fatores que limitam a expressão da produtividade da cultura do feijão-caupi, a competição com as plantas daninhas é um dos mais severos, devido aos prejuízos no rendimento, com perdas de até 90% dos grãos. Este trabalho teve como objetivo avaliar a interferência de plantas daninhas na produção e no conteúdo relativo de nutrientes na parte aérea de plantas de feijão-caupi. O experimento foi conduzido em blocos casualizados, com arranjo em parcelas subdivididas e quatro repetições. As parcelas consistiram em três espécies de plantas daninhas: Acanthospermum hispidum, Euphorbia heterophylla e Eleusine indica, e as subparcelas, cinco densidades destas plantas: 0, 4, 8, 16 e 32 plantas por vaso, o equivalente a 0, 88, 176, 352 e 704 plantas m -2 , respectivamente. A densidade da cultura permaneceu constante (uma planta por vaso). As características avaliadas foram: número de folhas por planta, altura das plantas, número de vagens, comprimento médio de vagens, produtividade e conteúdo de nutrientes nas folhas do feijão. A. hispidum, E. heterophylla e E. indica causaram decréscimos em todas as características avaliadas. E heterophylla foi a espécie mais agressiva, reduzindo 84% da produtividade, e a espécie com maior capacidade de acúmulo de nutrientes em seus tecidos.
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