Levantamento fitossociológico de plantas daninhas em áreas de produção de cana-de-açúcar

Oliveira, A. R. de; Freitas, S.P.

doi:10.1590/s0100-83582008000100004

Cited by 101 publications

(113 citation statements)

References 9 publications

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“…In order to outline weed management strategies in cultivated environments, it is indispensable to carry out surveys to identify and quantify the dynamics of populations of weeds in the weed community to define the best moment and the weed control method to be adopted, whether cultural, mechanic, physical, biological, chemical or integrated, because the infestation conditions and the handling options are very different (Oliveira and Freitas, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…The phytosociological studies compare the populations of weeds at a certain point. Scheduled repetitions of phytosociological studies may indicate variation trends of the importance of one or more populations, and these variations may be associated to the agricultural practices adopted (Oliveira and Freitas, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…In the identification of weed species that are present in the area, as well as those that present greater importance, the phytosociological variables taken into account are frequency, density, abundance and importance value index (Oliveira and Freitas, 2008). The phytosociological indexes are highly important for the analysis of the impact the handling systems and agricultural practices have on the dynamics of growth and occupation of weed communities in agroecosystems (Pitelli, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Phytosociological Survey of Weeds in Cultivars of Common Beans With Different Types of Growth in the North of Minas Gerais

et al. 2016

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-The objective of this paper was to characterize the phytosociology of weeds in function of different types of growth of common bean cultivars in the North of Minas Gerais. The study was conducted in the experimental area, located in the municipality of Janaúba, MG. The treatments consisted of eight commercial cultivars of common beans with different types of growth. The design was done in randomized blocks, with three replications. The soil preparation was conventional and the planting was done in June, with manual seeders, with a 0.5 m spacing between rows. The phytosociological survey was performed in two phases of bean cultivation, in stages V3 and R8. The method used was the square inventory one, with a 0.25 m 2 frame, randomly released once in each plot. Samples of each square were identified and quantified by family, genus and species, and the sampled plants were collected with their complete structure. Next, the material was sent to a drying greenhouse with forced air circulation at 65 o C for 72 hours, for drying and determination of weight of dry matter. We also estimated the Relative Frequency, Relative Density and Relative Abundance to determine the importance value index and similarity index. At the V3 stage, the species Sorghum halepense, Brachiaria plantaginea and Boerhavia diffusa had higher importance value indexes. At the R8 stage, the Amaranthus viridis specie showed higher importance value index and dry matter. In more prostrate cultivars, the weeds present lower importance value indexes at the R8 stage.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phytosociological Survey of Weeds in Cultivars of Common Beans With Different Types of Growth in the North of Minas Gerais

et al. 2016

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“…The SI constitutes a range from 0 to 100%, being maximal when all species are common to both areas and minimal when there are no common species (Oliveira and Freitas, 2008).…”

Section: Methodsmentioning

confidence: 99%

Phytosociological Survey of Weeds in Carpet Grass in Distinct Periods of the Year

et al. 2016

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-Lawn with grass classified as Axonopus compressus is very common in BrazilSouthern region, where it normally presents an adequate low temperature tolerance and a high diversity of weed infestation. This work has aimed to conduct a phytosociological survey of weeds in lawn consisting of Axonopus compressus from CEDETEG/UNICENTRO University campus located in the Brazilian municipality of Guarapuava, in the state of Paraná, in different periods of 2013. One hundred eighty 0.50 x 0.50 m samples were collected in four months, from which parameters frequency, density, abundance, relative frequency, relative density, relative abundance and importance value index were calculated. In general, 24, 7, 17 and 14 weed species were identified, distributed in 23, 3, 8 and 6 families, respectively, in April, June, October and December. The largest number of weed species was identified in Asteraceae, Fabaceae and Cyperaceae families. The ones classified as the most important and with occurrence over all periods of year were Trifolium repens (Fabaceae), Soliva pterosperma (Asteraceae) and Oxalis corniculata (Oxalidaceae). Keywords: Axonopus compressus, lawn, identification. RESUMO -Gramados com a grama denominada sempre-verde (Axonopus

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“…A ocorrência de um ou mais desses componentes de interferência poderá reduzir a quantidade de colmos colhidos e diminuir o número de cortes economicamente viáveis. Essas interferências estão amplamente relatadas em diversos artigos científicos (Durigan et al, 2006;Kuva et al, 2007;Oliveira & Freitas, 2008).…”

Section: Introductionunclassified

Influência da palha e da simulação de chuva sobre a eficácia da mistura formulada clomazone + hexazinone no controle de plantas daninhas em área de cana-crua

Negrisoli

Velini²,

Corrêa³

et al. 2011

Planta daninha

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RESUMO -O experimento teve o objetivo de avaliar os efeitos da cobertura de palha e da simulação de chuva sobre a eficácia da mistura formulada clomazone + hexazinone no controle de plantas daninhas em área de cana-crua. Foi avaliado o controle de Brachiaria decumbens, Ipomoea grandifolia, Ipomoea hederifolia e Euphorbia heterophylla. A dose do herbicida utilizada foi de 2,2 kg ha -1 de produto comercial, correspondendo a 880 e 220 g ha -1 dos ingredientes ativos clomazone e hexazinone, respectivamente. Os tratamentos utilizados foram: T1) semeadura + palha 5 t ha -1 + aplicação + chuva de 30 mm (1DAA); T2) semeadura + chuva de 30 mm + palha 5 t ha -1 + aplicação; T3) semeadura + aplicação + palha 5 t ha -1 ; T4) semeadura + palha 5 t ha -1 + chuva de 30 mm + aplicação (12h após); T5) semeadura + palha 5 t ha -1 + aplicação + chuva de 2,5 mm (logo após); T6) semeadura + aplicação + chuva de 30 mm; T7) testemunha sem palha; e T8) testemunha com 5 t ha -1 de palha, totalizando oito tratamentos com quatro repetições, dispostos no delineamento experimental de blocos casualizados. Foram feitas avaliações visuais de controle aos 6, 13, 21, 27 e 35 dias após a aplicação (DAA). Para controle de B. decumbens, os melhores tratamentos foram aqueles nos quais o herbicida foi aplicado diretamente no solo, recebendo ou não uma camada de palha sobre o solo após a aplicação do herbicida, e quando foi aplicado sobre a camada de palha, recebendo uma chuva após a aplicação. Para a espécie E. heterophylla, os resultados foram bastante satisfatórios, proporcionando médias acima de 98% de controle, quando ocorreram precipitações posteriores à aplicação do herbicida. De modo geral, os tratamentos com a aplicação do herbicida, na ausência ou presença de palha, e posterior chuva apresentaram controle total da espécie I. hederifolia aos 35 DAA. Todos os tratamentos mostraram excelente controle para a espécie I. grandifolia.Palavras-chave: Saccharum spp., cana-de-açúcar, herbicidas.ABSTRACT -The experiment was conducted to evaluate the efficacy ofcombining clomazone + hexazinone and straw cover to control weeds in raw sugarcane area. The species Brachiaria decumbens, Ipomoea grandifolia, Ipomoea hederifolia and Euphorbia heterophylla were evaluated. The herbicide rate used was 2.2 kg ha -1 of the commercial product, corresponding to 880 and 220 g ha -1 of the active ingredients, clomazone and hexazinone, respectively. The treatments were: T1) seeding + 5 t ha -1 of straw + application + rain 30 mm (1 DAA); T2) seeding + rain (30 mm) + 5 t ha -1 of straw + application; T3) seeding + application + 5 t ha -1 of straw; T4) seeding + 5 t ha -1 of straw + rain (30 mm) + application (after 12h); T5) seeding + 5 t ha -1 of straw + application + rain 2.5 mm (after application); T6) seeding + application + rain (30 mm); T7) control without straw, and

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Levantamento fitossociológico de plantas daninhas em áreas de produção de cana-de-açúcar

Cited by 101 publications

References 9 publications

Phytosociological Survey of Weeds in Cultivars of Common Beans With Different Types of Growth in the North of Minas Gerais

Phytosociological Survey of Weeds in Cultivars of Common Beans With Different Types of Growth in the North of Minas Gerais

Phytosociological Survey of Weeds in Carpet Grass in Distinct Periods of the Year

Influência da palha e da simulação de chuva sobre a eficácia da mistura formulada clomazone + hexazinone no controle de plantas daninhas em área de cana-crua

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