Seletividade de herbicidas para cana-de-açúcar no sistema Plene® em pré e pós-emergência

Bertolino, Carmino Barbosa; Alves, Pedro Luís da Costa Aguiar

doi:10.7824/rbh.v13i3.249

Cited by 7 publications

(5 citation statements)

References 9 publications

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“…ha -1 ) in pre-emergence of cultivar SP81-3250 (Plene ® system) caused severe injury, which reflected in high harvest losses. The herbicide also reduced plant height by 33.6 cm, the number of tillers by 13, the leaf + stem dry mass by 40.1 g and the root dry mass by 96.9 g, all compared to the control (without application), 110 days after budding (Bertolino and Alves 2014). In the present work, the use of imazapic (133 g a.i.…”

Section: Discussionmentioning

confidence: 89%

Chemical management of Cyperus rotundus L. and other weeds at sugarcane in PSS system

et al. 2021

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Among the main weeds with difficult to control in the sugarcane fields can be cited purple nutsedge (Cyperus rotundus L.). This specie was observed in the seed bank in sugarcane fields harvested with or without burning. The objective of this study was to evaluate the efficacy of herbicides in pre-sprouted seedlings (PSS) of sugarcane in the control of C. rotundus and other weeds. The work was carried out in the field, in a randomized complete block design, and four replications. The treatments corresponded to the herbicides applied in pre-planting: sulfentrazone (800 g a.i. ha-1), diclosulam (193.17 g a.i. ha-1), imazapic (133 g a.i. ha-1) and imazapyr (500 g a.e. ha-1); post-planting: halosulfuron (112.5 g a.i. ha-1), ethoxysulfuron (135 g a.i. ha-1), MSMA (1,975 g a.i. ha-1) and 2,4-D (1,340 g a.e. ha-1); besides a control treatment weeding and another without weeding. The symptoms of injury on sugarcane plants, percentage of weed control, variables related to agronomic performance of sugarcane, and yield were evaluated. The herbicides diclosulam, imazapic, and imazapyr caused serious damage to the crop. The halosulfuron, ethoxysulfuron, MSMA, and 2,4-D did not cause symptoms of injury to sugarcane, however, the treatments had a reduced yield due to the low weed control. The sulfentrazone treatment obtained the second highest yield but with effective weed control (>70%) up to 45 days after planting. The best controls were obtained with pre-planting treatments; however, herbicide positioning studies should be performed in relation to PSS.

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Section: Discussionmentioning

confidence: 89%

Chemical management of Cyperus rotundus L. and other weeds at sugarcane in PSS system

et al. 2021

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“…However, the sugarcane cultivar used in this work are highly selective to ametryn. This herbicide did not alter the physiological and productive characteristics of SP 81-3250 (FARIA et al, 2013;BERTOLINO;ALVES 2014;FERREIRA et al, 2005), indicating that the highest CO 2 emission at 90 DAA is due to the direct effect of the herbicide on the soil microorganisms. The response time of the microbial community that develops in soils cultivated with SP 81-3250 was not immediate, and the greatest CO 2 emission in soils treated with ametryn may arise as the microorganisms are exposed to this agrochemical.…”

Section: Resultsmentioning

confidence: 99%

Activity of Rhizosphere Soil Microorganisms of Sugarcane Cultivars After Spraying of Herbicides: Diuron, Tebuthiuron, Ametryn and Diuron + Hexazinone

et al. 2018

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Changes in the agricultural environment can be determined by providing microbiological indicators of the soil since the soil microorganisms are sensitive to variations in the environment. In this way, the impact of herbicides of long residual effect on the rhizospheric soil microorganisms of sugarcane cultivars was evaluated. The cultivars of sugarcane (SP 81-3250 and RB 867515) were treated with four herbicides (tebuthiuron, diuron, ametryn and mixture of diuron + and hexazinone) applied in pre-emergence. The herbicides were applied seven days after the planting of the gems. At 30, 60 and 90 days after the application, the soil rhizosphere was collected in each treatment to determine the CO2 evolution of the soil (C-CO2), microbial biomass carbon (MBC), metabolic quotient (qCO2), solubility potential of inorganic phosphorus P (PSFI) and percentage of roots colonized by mycorrhizal fungi Arbuscular. No changes were observed in the microbial activity of the sugarcane rhizosphere at 30 days after application of the herbicides (DAA). However, at 90 DAA, all herbicides negatively affected the activity of the rhizospheric microorganisms of sugarcane. The metabolic activity of rhizosphere in soil cultivated with RB 867515 was less affected by herbicides. Keywords: Rhizosphere. Soil microorganisms. Residual effect. ATIVIDADE DA MICROBIOTA RIZOSFÉRICA DE CULTIVARES CANA-DE-AÇÚCAR APÓS APLICAÇÃO DOS HERBICIDAS: DIURON, TEBUTHIURON, AMETRYN E DIURON + HEXAZINONE RESUMO -Alterações no ambiente agrícola podem ser determinadas por meio indicadores microbiológicos do solo, uma vez que a microbiota do solo é sensível às modificações do ambiente. Desta forma, avaliou-se o impacto de herbicidas de longo efeito residual sobre a microbiota rizosférica de cultivares de cana-de-açúcar. As cultivares de cana-de-açúcar SP 81-3250 e RB 867515 foram tratadas com quatro herbicidas (tebuthiuron, diuron, ametryn e a mistura diuron + hexazinone) aplicados em pré-emergência. Os herbicidas foram aplicados sete dias após o plantio das gemas. Aos 30, 60 e 90 dias após a aplicação, o solo rizosferico de cada tratamento foi coletado para determinar a evolução de CO 2 no solo (C-CO 2 ), o carbono da biomassa microbiana (MBC), o quociente metabólico (qCO 2 ), o potencial de solubilização de P inorgânico (PSFI) e a percentagem de raízes colonizadas por fungos micorrízicos arbusculares. Não foram observadas alterações na atividade microbiana da rizosfera da cana-de-açúcar aos 30 dias após a aplicação dos herbicidas (DAA). No entanto, aos 90 DAA todos os herbicidas afetaram negativamente a atividade dos micro-organismos rizosféricos da cana-de-açúcar. A atividade metabólica da rizosfera em solo cultivado com a RB 867515 foi menos afetada pelos herbicidas. Palavras-chave: Rizosfera. Microrganismos do solo. Efeito residual.

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“…Therefore, these species may be the most problematic weeds for control, since the use of selective herbicides will be difficult because the crop is also grassy. However, it is known that the herbicides diuron+hexazinone+sulfometuronmethyl and amicarbazone+isoxaflutole are efficient in the control of P. maximum and B. decumbens, and diuron+hexazinone and amicabazone are selective to sugarcane in the 'Plene' system (Giancotti et al, 2012;Bertolino and Alves, 2014). Paula (2015) reported the grasses B. decumbens and P. maximum as the most aggressive species to the initial development of sugarcane plants from meristematic seedlings when compared to the species I. hederifolia and D. horizontalis; at 90 days of coexistence, the presence of 2 plants pot -1 of these species caused a reduction in dry matter accumulation of approximately 55%, 47%, 50%, and 24%, respectively.…”

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confidence: 99%

Interference Relationships Between Weeds and Sugarcane in the ‘Plene’ System

et al. 2019

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Sugarcane is one of the most important crops planted in Brazil in that the presence of weeds in the fields has promoted significant yield reduction. The objective of this work was to evaluate the differential growth response of two sugarcane varieties cropped in the ‘Plene’ system as a function of the coexistence with different weed species. Treatments consisted of the coexistence of Bidens pilosa plus Ipomoea quamoclit, Ipomoea hederifolia, Amaranthus viridis, Urochloa plantaginea, Panicum maximum, and Digitaria horizontalis with two sugarcane varieties (RB92579 and SP80-1842) cropped in the ‘Plene’ system, in addition to a control without weeds. The design was completely randomized with three replicates. Dry matter accumulation of weeds was dependent of the weed species and the sugarcane variety whose coexistence was kept. The behavior of development in terms of plant height, number of green leaves, leaf area, and dry mass of stems, roots and leaves was dependent on the sugarcane variety and on the weed species whose coexistence was kept. The weed U. plantaginea showed the greatest potential to interfere with the growth of both sugarcane varieties planted in the ‘Plene’ system. Panicum maximum and D. horizontalis are also potential competitors, while B. pilosa, I. quamoclit, I. hederifolia, and A. viridis are less competitive. The sugarcane variety RB92579 is less susceptible to weed interference than SP80-1842 when planted in the ‘Plene’ system.

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Seletividade de herbicidas para cana-de-açúcar no sistema Plene® em pré e pós-emergência

Cited by 7 publications

References 9 publications

Chemical management of Cyperus rotundus L. and other weeds at sugarcane in PSS system

Chemical management of Cyperus rotundus L. and other weeds at sugarcane in PSS system

Activity of Rhizosphere Soil Microorganisms of Sugarcane Cultivars After Spraying of Herbicides: Diuron, Tebuthiuron, Ametryn and Diuron + Hexazinone

Interference Relationships Between Weeds and Sugarcane in the ‘Plene’ System

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