Inibição do desenvolvimento inicial de plantas de girassol, milho e triticale por palhada de capim-colchão

Pereira, María Renata Rocha; Teixeira, Renake Nogueira; Souza, Gustavo Soares de; Silva, J.I.C.; Martins, Darliane Aparecida

doi:10.1590/s0100-83582011000200008

Cited by 9 publications

(4 citation statements)

References 13 publications

(4 reference statements)

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“…tem capacidade de produzir um grande número de sementes, facilitando sua dispersão, bem como a capacidade competitiva e a fecundidade das espécies em um ambiente competitivo (FONTANA et al, 2016). A D. sanguinalis infesta as lavouras vindo a reduzir a produtividade das culturas, mesmo em baixa densidade (PEREIRA et al, 2011). Wang et al, (2018)…”

Section: Methodsunclassified

Competição entre híbridos de milho com plantas daninhas

Galon

Gabiatti

Agazzi³

et al. 2020

SAS

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As plantas daninhas Digitaria ciliaris (milhã) e Ipomoea indivisa (corda-de-viola) destacam-se por ocasionarem elevados prejuízos à cultura do milho. Objetivou-se com o trabalho avaliar a interação competitiva relativa entre híbridos de milho na presença de milhã e corda-de-viola, por meio de experimentos em série substitutiva. Os experimentos foram instalados em delineamento experimental de blocos casualizados, com quatro repetições. Primeiramente, tanto para os híbridos de milho (Agroeste - AS 1551 PRO 2, Morgan - MG 300 PW, Nidera - NS 92 PRO and Syngenta - Velox TL) quanto para as plantas daninhas (milhã e corda-de-viola) determinou-se a densidade de plantas em que a produção final se tornou constante (20 plantas vaso-1 ou 463 plantas m-2). Posteriormente foram instalados oito experimentos para avaliar a habilidade competitiva dos híbridos de milho com as plantas daninhas, ambos conduzidos em série de substituição, nas diferentes combinações das espécies, variando-se as proporções relativas (100:0, 75:25, 50:50, 25:75 e 0:100%) de plantas vaso-1 (20:0; 15:5; 10:10; 5:15 e 0:20). A análise da competitividade das espécies foi efetuada por meio de diagramas aplicados a experimentos substitutivos e também pelos índices de competitividade relativa. Aos 50 dias após a emergência das espécies efetuou-se a aferição da área foliar e da massa seca da parte aérea das plantas. Os híbridos de milho e as plantas daninhas foram afetados negativamente, sendo a competição interespecífica a mais prejudicial para as espécies. A cultura apresentou os maiores índices de competitividade, de crescimento, de dominância e de agressividade. Ao se comparar as espécies entre si, o milho foi mais competitivo do que as plantas daninhas.

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Section: Methodsunclassified

Competição entre híbridos de milho com plantas daninhas

Galon

Gabiatti

Agazzi³

et al. 2020

SAS

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“…Some studies have shown similar results (Periotto et al, 2004;Maraschin-Silva & Áqüila, 2005;Silva-Candido et al, 2010;Pereira et al, 2011). According to Ferreira & Aquila (2000) the germination is less sensitive to allelochemicals than the seedling growth, because the allelopathic substances may induce the appearance of abnormal seedlings, for example, with symptoms of necrosis in the root.…”

Section: Resultsmentioning

confidence: 79%

Allelopathy of leaf extracts of jatropha (Jatropha curcas L.) in the initial development of wheat (Triticum aestivum L.)

Reichel

Barazetti

Stefanello

et al. 2013

Idesia

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Allelopathy of leaf extracts of jatropha (Jatropha curcas L.)in the initial development of wheat (Triticum aestivum L.) ABSTRACTThe objective of this study was to evaluate the effect of extracts obtained from leaves of Jatropha curcas L. on germination and initial growth of wheat. The aqueous and alcohol (ethanol and methanol) extracts of dried leaves were prepared in the concentration of 50 mg/mL. From the crude extract were made dilutions and obtained different concentrations. Some of the aqueous extracts tested were autoclaved. Over seven days, the germination characteristics and growth of wheat seedlings were evaluated with the different treatments. There was no effect of aqueous extracts on percentage of seed germination, however the methanolic and ethanolic extracts 5% affected the germination of a cultivar in study. There was a decrease in the germination speed index when the seeds were incubated with crude aqueous extract and methanol extract. The extracts affected the growth of seedlings and the most phytotoxic was the ethanol extract 5%. The autoclaved extracts promoted a reduction in all parameters evaluated. The results presented here show the extracts of dried leaves of jatropha promoted allelopathic effects on wheat. Key words: extract, interference, germination, growth of seedlings. RESUMEN El objetivo de la investigación fue evaluar el efecto de los extractos obtenidos a partir de hojas de Jatropha curcas L. sobre la germinación y el crecimiento inicial del trigo. Las acuosas y alcohol (etanol y metanol) extractos de hojas secas

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“…The high aggressiveness associated with high yield, ease of dispersal, and longevity of seeds are attributes that enable high survival and perpetuation of these species (Baker, 1965;Hill, 1977;Lorenzi, 2007). These plants directly affect crop growth and yield by competing for essential growth resources and/or releasing allelopathic substances (Pereira et al, 2011).…”

Section: Weeds and Chemical Managementmentioning

confidence: 99%

Weed Management and Herbicide Selectivity in Ornamental Plants

Martins

Silva

2019

Planta daninha

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Floriculture and landscaping sector has the same problems as other crops regarding weed management. Weeds affect the yield and quality of the harvested product, in which the visual aspect and aesthetics stand out as the most important factors in flower production and landscaping. Weed control in floriculture and landscaping is critical and costly because maintaining the beauty of the product and the use of herbicides is a low-cost management tool compared to manual management. However, it implies knowing herbicide selectivity, as ornamental species may present some injury depending on the active ingredient and the degree of selectivity of the compound. Because the use of this practice in flower production and landscaping both abroad and mainly in Brazil is incipient, aspects of selectivity, chemical weed control, and safe application of different herbicides are addressed in this paper.

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Inibição do desenvolvimento inicial de plantas de girassol, milho e triticale por palhada de capim-colchão

Cited by 9 publications

References 13 publications

Competição entre híbridos de milho com plantas daninhas

Competição entre híbridos de milho com plantas daninhas

Allelopathy of leaf extracts of jatropha (Jatropha curcas L.) in the initial development of wheat (Triticum aestivum L.)

Weed Management and Herbicide Selectivity in Ornamental Plants

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