Avaliação de extratos das espécies Helianthus annuus, Brachiariabrizanthae Sorghum bicolor com potencial alelopático para uso como herbicida natural

Oliveira, Juliana Santos Batista; Peixoto, Clovis Pereira; Poelking, V.G.C; Almeida, Ademir Trindade

doi:10.1590/1983-084x/13_040

Cited by 12 publications

(12 citation statements)

References 14 publications

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“…On the other hand, radicle is one of the parts with greater sensitivity to allelochemicals (Reigosa et al, 2013), as observed in the results found in this work. Oliveira et al, (2015), also observed this effect when testing brachiaria, sunflower and sorghum extracts on lettuce seeds, found no effect on germination, but a decrease of root system and formation of normal seedlings.…”

Section: Resultsmentioning

confidence: 82%

Allelopathic potential of Cover Crops in Control of Shrubby False Buttonweed (Spermacoce verticillata)

2018

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potential of cover crops in control of shrubby false buttonweed ... ABSTRACT -Searching for alternatives to deal with weeds without the exclusive use of herbicides can increase the sustainability of agricultural production in the Amazon region. This study aimed to evaluate the allelopathic potential of cover crops on the weed shrubby false buttonweed (Spermacoce verticillata L.). Three straw levels (1; 2.5 and 5 mg cm -2 ) of thirteen cover crops (Cajanus cajan, Canavalia ensiformis, Crotalaria juncea, C. ochroleuca, C. spectabilis, Mucuna aterrima, M. cinereum, Pennisetum glaucum, Sorghum bicolor, S. sudanense, Urochloa brizanha cv. Xaraés, U. brizantha cv. Piatã and U. ruziziensis) were assessed on germination and initial growth of weed and lettuce. We carried out two experiments (weed and lettuce) in a factorial scheme (cover crops x straw levels) with additional treatment (control without straw) in a completely randomized experimental design, with four replicates. The straw of the cover crops inhibited the germination and initial growth of the target plants. The highest straw levels promoted 44.0 and 78.8% reductions in radicle length in relation to the lowest dose (1 mg cm -2 ), for lettuce and Spermacoce verticillata, respectively. The highest sensitivity to allelochemicals occurred on the radicle. The major suppressive effects on weed germination were promoted by Cajanus cajan, Urochloa brizanha cv. Xaraés, Mucuna cinereum, M. aterrima, Canavalia ensiformis, Crotalaria juncea, C. spectabilis and U. ruziziensis. Cover crops use is an integrated practice management to control Spermacoce verticillata under no-tillage system.RESUMO -A busca por alternativas no manejo de plantas daninhas sem a utilização exclusiva de herbicidas pode contribuir para aumento da sustentabilidade na produção agrícola na região Amazônica. Objetivou-se neste estudo avaliar o potencial alelopático de plantas de cobertura, sobre a planta daninha vassourinhade-botão (Spermacoce verticillata L.). Três níveis de palhada (1; 2,5 e 5 mg cm -2 ) de treze plantas de cobertura (Cajanus cajan, Canavalia ensiformis, Crotalaria juncea, C. ochroleuca, C. spectabilis, Mucuna aterrima, M. cinereum, Pennisetum glaucum, Sorghum bicolor, S. sudanense, Urochloa brizanha cv. Xaraés, U. brizantha cv. Piatã e U. ruziziensis) foram avaliados, sobre a germinação e o crescimento inicial da planta daninha e da alface. Dois experimentos foram instalados (planta daninha e alface) em esquema fatorial (plantas de cobertura x níveis de palhada) com tratamento adicional (testemunha sem palhada) em delineamento experimental inteiramente casualizado, com quatro repetições. As palhadas das plantas de cobertura inibiram a germinação e o crescimento inicial potential of cover crops in control of shrubby false buttonweed ... 2 das plantas alvo. Os maiores níveis de palhada promoveram reduções de 44,0 e 78,8% no comprimento da radícula em relação à menor dose (1 mg cm -2 ), para a alface e para a vassourinha-de-botão, respectivamente. A maior sensibilidade aos aleloq...

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Section: Resultsmentioning

confidence: 82%

Allelopathic potential of Cover Crops in Control of Shrubby False Buttonweed (Spermacoce verticillata)

2018

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“…After 24 hours at rest, the mixture was filtered on filter paper to obtain a 100% extract (w/v). This most concentrated 100% extract (w/ v) was diluted to obtain the other concentrations of 80, 60, 40, 20, and 0% (distilled water) (Oliveira et al, 2015).…”

Section: Obtaining the Extractmentioning

confidence: 99%

“…However, the effectiveness of control against some weeds may not occur immediately, such as that of commercial herbicides, but could be built over time, as with most natural products (Belz, 2007). Oliveira et al (2015) assessed the allelopathic potential of aqueous extracts of saccharine sorghum on germination and initial growth of lettuce (Lactuca sativa) and observed that the aqueous extracts affected germination, root system growth, and the formation of normal seedlings of lettuce. Lettuce seedlings also have their root development compromised due to root exudates of forage sorghum (Barbosa et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Allelopathic Potential of Sorghum bicolor at Different Phenological Stages

et al. 2019

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This study aimed to assess the allelopathic potential of the aqueous extract of the shoot of Sorghum bicolor at different phenological stages on seed germination and initial growth of kale (Brassica oleracea var. acephala) seedlings, which is considered a bioindicator species. The experiment was carried out at five development stages of S. bicolor (40, 50, 60, 70, and 80 days after emergence), which was used as aqueous extract at six concentrations (0, 20, 40, 60, 80, and 100%) applied in four replications per treatment in 10 or 50 kale seeds per plot. The percentage of germination, germination rate index, root growth, shoot length, and dry matter of kale seedlings were analyzed in the presence of this extract on different days of collection and concentrations. The aqueous extract of S. bicolor presented an allelopathic effect on germination and initial growth of kale seeds, with a higher inhibitory effect when more concentrated extracts from pre-flowering plants were used, which corresponds to 60 days after emergence. Thus, this stage should be recommended in the use of S. bicolor straw to help in controlling weeds.

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“…It should also be considered that sorghum straw has a high C/N ratio and, consequently, a higher soil persistence (Landau & Sans, 2008). Some studies have shown that the use of sorghum may allelopathically affect the development or germination of different plant species, such as wild poinsettia, morning glory, southern sandbur, and others (Carvalho, Teixeira, Neto, Moreira, & Cunha, 2016;Gomes, Bevilaqua, Silva, & Monquero, 2014;Oliveira, Peixoto, Poelking, & Almeida et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Control of Invasive Plants by the Phytotoxicity Effect of Sorghum bicolor [L.] Moench

Freitas¹,

Ricardo²,

Zonetti³

et al. 2019

JAS

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Owing to an increasing demand for food, a constant agricultural production flow must be maintained. Further, for doing so, the use of pesticides is necessary. An alternative that results in less damage to the ecosystem and people themselves may be identified by studies on the allelopathic effect of weeds. Therefore, this work aimed to evaluate the allelopathic action of hexane, dichloromethane, butanol, and ethyl acetate fractions of sorghum (Sorghum bicolor [L.] Moench) on the initial growth of morning glory (Ipomoea grandifolia [Dammer] O’Donell) and slim amaranth (Amaranthus hybridus L.), which was verified by the percentage of germination, speed of germination, seedling length, and fresh and dry biomass weight. The experiments were conducted in an incubation chamber at 25 °C for 7 and 14 days for morning glory and slim amaranth, respectively. The experimental design was completely randomized, with five replicates in Petri dishes. The data were evaluated by analysis of variance, and the averages between each treatment were compared using the Scott Knott test at a 5% significance level. The results indicated that the dichloromethane and ethyl acetate fractions decreased the initial growth of morning glory and slim amaranth more, when compared with the effects of hexane and butanol.

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Avaliação de extratos das espécies Helianthus annuus, Brachiariabrizanthae Sorghum bicolor com potencial alelopático para uso como herbicida natural

Cited by 12 publications

References 14 publications

Allelopathic potential of Cover Crops in Control of Shrubby False Buttonweed (Spermacoce verticillata)

Allelopathic potential of Cover Crops in Control of Shrubby False Buttonweed (Spermacoce verticillata)

Allelopathic Potential of Sorghum bicolor at Different Phenological Stages

Control of Invasive Plants by the Phytotoxicity Effect of Sorghum bicolor [L.] Moench

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