Seletividade de herbicidas pré-emergentes ao pinhão-manso (Jatropha curcas)

Rocha, Paulo Roberto Ribeiro; Silva, A.F; Faria, A.T.; Galon, Leandro; Ferreira, Evander Alves; Felipe, R.S.; Silva, A.A; Dias, Luiz A. S.

doi:10.1590/s0100-83582010000400013

Cited by 11 publications

(7 citation statements)

References 12 publications

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“…Herbicide trifluralin, used at low concentrations, did not interfere with the initial growth of the pioneer species Croton urucana and Muntingia calabura (Moraes Neto et al, 2010). Jatropha curcas plants show high sensitivity to the herbicide isoxaflutole, since the doses of the product caused severe plant damage, negatively influencing all evaluated variables (Rocha et al, 2010;Inoue et al, 2014). These results are similar to those found in this research using species M. interrupta, where herbicide trifluralin did not affect the variables evaluated in relation to the control; herbicide isoxaflutole, in turn, damaged the seedlings of the species, regardless of the dose.…”

Section: Resultsmentioning

confidence: 99%

Effect of pre-emergent graminicide herbicides on germination and early development of native species

Marques¹,

Pinheiro²,

Marques³

et al. 2019

Científica

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The occurrence of weeds has been the main obstacle to vegetation recovery in Cerrado areas unduly occupied by agricultural and livestock activities. This study evaluates the effect of different pre-emergent herbicides on the emergence, survival, and early development of seedlings of the native species jatobá (Hymenaea stigonocarpa), urucum (Bixa orellana), dry flour (Albizia hasslerii), and white jurema (Mimosa interrupta). The experiment was carried out under greenhouse conditions in a completely randomized experimental design with five replicates, where the treatments were constituted by herbicides: isoxaflutole, applied at the doses of 100, 200, and 300 g ai ha-1 ; pendimethalin, at 500, 1000, and 4000 g ai ha-1 ; and trifluralin, at 600, 1200, and 2400 g ai ha-1 ; in addition to a control treatment, without the application of herbicides. Herbicide phytotoxicity was evaluated at 35 days after emergence for the number of emerged seedlings, number of leaves per seedling, seedling height and diameter, and root and shoot dry weight. With the results obtained, it is possible to affirm that under the conditions of the experiment, all the herbicides and doses used did not affect the emergence and early development of seedlings of species H. stigonocarpa and B. orellana. For species A. hasslerii, the dose of 300 g ai ha-1 of herbicide isoxaflutole was not selective. All doses of the herbicide trifluralin showed selectivity for species M. interrupta.

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Section: Resultsmentioning

confidence: 99%

Effect of pre-emergent graminicide herbicides on germination and early development of native species

Marques¹,

Pinheiro²,

Marques³

et al. 2019

Científica

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“…Monquero et al (2011) afirmam que, a fim de utilizar o método químico de controle dessas plantas indesejáveis, são necessários estudos para selecionar herbicidas seletivos às espécies nativas utilizadas nos reflorestamentos. A seletividade dos herbicidas é a base para o sucesso do controle químico das plantas daninhas, sendo considerada uma resposta diferencial de diversas espécies de plantas a determinado ingrediente ativo do herbicida (Rocha et al, 2010).…”

Section: Introductionunclassified

Ação de herbicidas pré-emergentes no estabelecimento inicial de plântulas de espécies nativas do Cerrado

Marchi¹,

Marques²,

Araújo³

et al. 2018

RBHerbicidas

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Resumo -A dificuldade de controle das plantas daninhas tem sido considerada como um dos principais entraves ao sucesso dos projetos de recuperação da vegetação em áreas degradadas. O presente trabalho teve o objetivo de avaliar o efeito de diferentes herbicidas pré-emergentes sobre a emergência, sobrevivência e desenvolvimento inicial de plantas das espécies nativas amendoim bravo (Platypodium elegans), mutamba (Guazuma ulmifolia), carobinha (Jacaranda micrantha) e angico cuiabano (Anadenanthera colubrina). O experimento foi desenvolvido em casa de vegetação no delineamento experimental inteiramente casualizado, com cinco repetições. Os tratamentos foram constituídos pela aplicação em pré-emergência dos seguintes herbicidas e doses: isoxaflutole (75, 150 e 300 g i.a. ha -1 ), pendimenthalin (500, 1000 e 2000 g i.a. ha -1 ), trifluralin (600, 1200 e 2400 g i.a. ha -1 ) e uma testemunha padrão sem a aplicação de herbicidas. O efeito dos herbicidas foi avaliado quanto ao número de plântulas emergidas, número de folhas por plântula, altura de plântulas, diâmetro de plântulas na altura do coleto e matéria seca de raiz e folhas aos 35 dias após a germinação. Com os resultados obtidos foi possível afirmar que todos os herbicidas e doses utilizadas não prejudicaram a emergência e o desenvolvimento inicial das espécies P. elegans e J. micrantha. As doses de 150 e 300 g i.a. ha -1 do herbicida isoxaflutole foram não seletivas para a espécie arbórea G. ulmifolia. Apenas a dose de 600 g i.a. ha -1 do herbicida trifluralin apresentou seletividade para a espécie A. colubrina.Abstract -The weed control difficulties has been considered one of the most obstacles to success of forest recovery projects at degraded areas. This experiment aimed to evaluate the different pre-emergent herbicides effect on seed emergence, seedling survival and initial development of Brazilian native tree species Platypodium elegans, Guazuma ulmifolia, Anadenanthera colubrine and Jacaranda micrantha. The experiment was conducted under greenhouse conditions in a completely randomized design with five replications. The treatments were constituted by the pre-emergence application of the following herbicides and doses: isoxaflutole (75, 150 and 300 g a.i. ha -1 ), pendimenthalin (500, 1000 and 2000 g a.i. ha -1 ), trifluralin (600, 1200 and 2400 g a.i. ha -1 ) and untreated herbicide as a check control. The effect of the herbicides was evaluated for the number of seedlings emerged, number of leaves per seedlings, height of seedlings, diameter of stem and dry matter of root and leaves at 35 days after germination. With the results obtained it was possible to affirm that all herbicides and their respective rates were safe to P. elegans and G. ulmifolia trees. Isoxaflutol at 150 and 300 g a.i. ha -1 was not selective to G. ulmifolia specie. Only trifluralin at 600 and 1200 g a.i. ha -1 sowed selectivity to A. colubrina specie.

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“…The partial or complete replacement of diesel oil by biofuels is a viable and promising alternative for environmental sustainability (Rocha et al 2010). Jatropha is one of the crops with potential for producing biofuels, due to its high oil content in seeds (33-38 %), long reproductive cycle and high yield (Arruda et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Effects of clomazone formulations at the initial development of Jatropha curcas

Berté

Costa

Ramella

2015

Pesqui. Agropecu. Trop.

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Competition with weeds is one of the obstacles to achieve high yields in jatropha harvest. The chemical method is an alternative weed control due to its high efficiency, readiness and economy, when compared to other methods. However, products recommended for this crop are scarce. This study aimed at evaluating the effects of pre and post-emergence clomazone formulations at the initial development of jatropha. Two experiments were conducted under a randomized blocks design, in a 2 x 5 factorial arrangement, with four replications, consisting of the combination of two clomazone formulations (encapsulated suspension and emulsifiable concentrate) and five doses (0 g ha-1, 250 g ha-1, 500 g ha-1, 1,000 g ha-1 and 2,000 g ha-1). The dry matter of the plants was reduced both in the pre-emergence and post-emergence applications. Net photosynthesis was not affected by the application of clomazone in both formulations. The encapsulated suspension formulation is less phytotoxic than the emulsifiable concentrate formulation for pre and post-emergence applications. However, both formulations negatively affect the early development of jatropha plants.

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Seletividade de herbicidas pré-emergentes ao pinhão-manso (Jatropha curcas)

Cited by 11 publications

References 12 publications

Effect of pre-emergent graminicide herbicides on germination and early development of native species

Effect of pre-emergent graminicide herbicides on germination and early development of native species

Ação de herbicidas pré-emergentes no estabelecimento inicial de plântulas de espécies nativas do Cerrado

Effects of clomazone formulations at the initial development of Jatropha curcas

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