Remoção mecânica de plantas aquáticas: análise econômica e operacional

Antuniassi, Ulisses Rocha; Velini, Edivaldo Domingues; Martins, D.

doi:10.1590/s0100-83582002000400004

Cited by 14 publications

(7 citation statements)

References 2 publications

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“…Two other techniques frequently used to control aquatic vegetation are mechanical removal and the application of herbicides. Mechanical removal can be manual or done with big machines such as backhoes installed in a haft, but it can be very expensive in large areas (Langeland, 1996;Antuniassi et al, 2002;Thomaz, 2002). The use of herbicides can be limited by several factors, such as restrictions due to the water resource uses and threats to human health, environmental attributes such as water body volume and hydraulic residence time, damage to the native biota, lack of knowledge about the herbicide's effects on plants and habitats, costs, lack of government regularization, or public opposition (Madsen, 1997;Mullin et al, 2000).…”

Section: Control and Managementmentioning

confidence: 99%

Hydrilla verticillata (Hydrocharitaceae), a recent invader threatening Brazil’s freshwater environments: a review of the extent of the problem

Sousa

2011

Hydrobiologia

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Hydrilla verticillata (Hydrocharitaceae) is a highly prolific, rooted submerged macrophyte native to Asia that has invaded aquatic systems worldwide, causing many ecological and humanrelated problems. Hydrilla recently invaded the Paraná River basin in Brazil, making other ecologically and socially important Brazilian watersheds more susceptible to invasion by this plant. Here, I summarize the relevant information about Hydrilla, focusing on its biotic attributes, abiotic tolerance and effects on ecosystems. The aim of this review is to provide background information to assist with plan-

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Section: Control and Managementmentioning

confidence: 99%

Hydrilla verticillata (Hydrocharitaceae), a recent invader threatening Brazil’s freshwater environments: a review of the extent of the problem

Sousa

2011

Hydrobiologia

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“…The results of this simulation are similar to those found by Cave (1981), who observed that the use of glyphosate and different equipment to control macrophytes corresponded to 10% of the cost of mechanical control. Antuniassi et al (2002) found that the monthly cost of the mechanical removal of macrophytes E. crassipes and B. arrecta was USD 54,055.53, while the cost of chemical control was USD 122.70, equivalent to 0.23% of the mechanical control.…”

Section: Cost Of Chemical and Mechanical Controlmentioning

confidence: 99%

“…The choice of method to be used for controlling aquatic plants depends on its efficiency and operating cost. In the literature, the mechanical removal of aquatic plants is the main form adopted in Brazil (Antuniassi et al, 2002). However, following the adoption of the Resolution * Herbicide cost is hypothetical and well above the average value of the herbicide in the market since the product is still in the registration phase.…”

Section: Cost Of Chemical and Mechanical Controlmentioning

confidence: 99%

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Efficacy of Imazamox with Centrifugal Energy Spray Nozzle on Eichhornia crassipes and Economic Analysis of Control Viability

et al. 2019

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The efficacy of imazamox to control Eichhornia crassipes with a centrifugal energy spray nozzle at doses and volumes of spray solution and the costs of mechanical and chemical control of aquatic plants were evaluated in this study. Imazamox doses consisted of 200, 400, and 600 g a.i. ha-1, and spray solution volumes consisted of 25, 50, and 100 L ha-1, with a control (without herbicide application) and ten replications. Applications were performed with a centrifugal energy spray nozzle. The evaluations were carried out considering the percentage of control at 7, 15, 21, and 30 days after application (DAA), and plant dry matter was measured at 30 DAA, as well as leaf retention of spray solutions. An efficacy from 96 to 100% and plant dry matter reduction from 88 to 100% was observed at 30 DAA using imazamox doses of 200, 400, and 600 g a.i. ha-1 and a spray solution volume of 50 L ha-1. Imazamox doses and spray solution volumes were effective in controlling E. crassipes, except for 200 g a.i. ha-1 and 25 L ha-1, respectively. The highest leaf retention of E. crassipes was 0.010 mL cm2 at an imazamox dose of 400 g a.i. ha-1 and volume of 50 L ha-1. The cost of chemical control was 20 times lower when compared to mechanical control, making it economically more viable. These results are important for decision-making on which method and application technology should be used to control E. crassipes.

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“…Todavia, esses equipamentos de colheita e retirada do material vegetal dos reservatórios geralmente apresentam elevado custo operacional, devido a fatores como custos diretos do maquinário, habilidade dos operadores, custos de propriedade dos equipamentos e custos de terceirização de serviços de transporte do material colhido até uma área de descarte (Antuniassi et al, 2002). Outro fator importante é o baixo rendimento operacional dos equipamentos já desenvolvidos, o que reduz muito o intervalo entre as atividades de manutenção em um mesmo local.…”

Section: Introductionunclassified

Utilização de chama para controle de plantas daninhas emersas em ambiente aquático

et al. 2005

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Dois estudos foram conduzidos com o objetivo de avaliar os efeitos da aplicação de chama no controle de Eichhornia crassipes, Brachiaria subquadripara, Pistia stratiotes e Salvinia auriculata. No primeiro estudo foram utilizadas diferentes doses de chama, representadas pela quantidade de gás consumida durante a aplicação, e, no segundo, usaramse duas aplicações de chama em intervalo de 14 dias, uma aplicação seqüencial (intervalo de sete dias) e aplicação única. As diferentes doses, tanto no primeiro quanto no segundo, foram comparadas com plantas que não receberam nenhum tratamento térmico. Avaliações de injúria foram realizadas aos 1, 3, 7, 10, 14, 17, 21 e 30 após a aplicação dos tratamentos, sendo realizadas também avaliações das biomassas secas das plantas aquáticas remanescentes em cada tratamento, ao final dos ensaios. No primeiro estudo foram observadas reduções significativas na produção da biomassa seca das espécies E. crassipes, B. subquadripara e P. stratiotes tratadas com as maiores doses referentes aos consumos de gás. Doses menores não diferiram estatisticamente da testemunha quanto à produção de biomassa seca, exceção feita para a espécie P. stratiotes. Todas as aplicações seqüenciais proporcionaram redução acima de 90% na produção da biomassa seca de E. crassipes e B. subquadripara. As aplicações seqüenciais e únicas proporcionaram reduções abaixo de 37% na produção da biomassa seca de S. auriculata. Os resultados demonstraram que existe a possibilidade de se utilizar o controle físico através da aplicação de chama como alternativa no manejo de plantas daninhas em ambientes aquáticos.

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Remoção mecânica de plantas aquáticas: análise econômica e operacional

Cited by 14 publications

References 2 publications

Hydrilla verticillata (Hydrocharitaceae), a recent invader threatening Brazil’s freshwater environments: a review of the extent of the problem

Hydrilla verticillata (Hydrocharitaceae), a recent invader threatening Brazil’s freshwater environments: a review of the extent of the problem

Efficacy of Imazamox with Centrifugal Energy Spray Nozzle on Eichhornia crassipes and Economic Analysis of Control Viability

Utilização de chama para controle de plantas daninhas emersas em ambiente aquático

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