Production systems and weed control in annual crops of the Cerrado area of the State of Piauí

Pacheco, Leandro Pereira; Petter, Fabiano André; Soares, Leandro dos Santos; Silva, Rodrigo Fonseca da; Oliveira, João Batista da Silva

doi:10.5935/1806-6690.20160060

Cited by 6 publications

(8 citation statements)

References 8 publications

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“…There are some studies that show the effect of allelochemicals present in plant extracts on other plants. Pacheco et al (2016) studied the use of cover crops such as U. ruziziensis in no-tillage and conventional systems with soybean, corn and rice crops in the cerrado of Piauí and demonstrated significant reductions in the emergence and accumulation of weeds. Martinelli et al (2017) studied the effect of two species of Urochloa on the Citrus and found that Urochloa as a cover is a good option for the sustainable and integrated management of weeds.…”

Section: Introductionmentioning

confidence: 99%

Morphological and Biochemical Study of Bidens pilosa on the Effects of Extract of Urochloa ruziziensis

Coelho¹,

Galletti²,

Britta³

et al. 2019

JAS

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Bidens pilosa is an aggressive species that competes with crops and, in addition, has a high capacity to acquire resistance or tolerance to herbicides. Thus, the objective of the present study was to investigate the allelopathic effects of aqueous extract of Urochloa ruziziensis on germination, development, respiration, antioxidant enzymes and cells morphology of B. pilosa seedlings during initial growth at laboratory.The seeds were sown with water or U. ruziziensis extract at concentrations of 250, 500 and 900 ppm, and after four days the percentage of germinated seeds, root and hypocotyl development, as well as respiration, peroxidase and catalase activity by seedlings, were analysed. The results were submitted to analysis of variance (ANOVA) and the means compared by the Tukey test and regression analysis. The cellular structures of the root with U. ruziziensis extract treatment (0, 500 and 900 ppm) were also analysed by transmission electron microscopy. The application of the extract reduced the germination of the seeds. The root growth increased, however, there was a reduction in the dry matter mass at 500 ppm. Mitochondrial respiration decreased and there was an increase in the activity of the peroxidase and catalase enzymes at 500 ppm. Morphological changes in the cells were also found, mainly with this concentration. Thus, it is possible can be concluded that allelochemicals present in extract from U. ruziziensis have the potential to provoke oxidative stress in B. pilosa seedlings in laboratory, mainly at a concentration of 500 ppm. This oxidative stress caused alterations mainly in the energetic metabolism of this plant, being this a primordial factor for its growth and survival. y= -52,09x + 407,1 R 2 = 83% y= -40,71x + 322,8 R 2 = 89% y= -40,71x + 322,8 R 2 = 90% Aqueous extract of Urochloa ruzizienses Oxygen consumption (nmol min -1 g -1 )

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Section: Introductionmentioning

confidence: 99%

Morphological and Biochemical Study of Bidens pilosa on the Effects of Extract of Urochloa ruziziensis

Coelho¹,

Galletti²,

Britta³

et al. 2019

JAS

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“…This problem has been aggravated by conventional sowing since it constantly feeds the seedbank and favors Oryza sativa emergence by comparison with the pre-germinated system (CHAUHAN et al, 2013). The amount and diversity of the seed bank in the soil may undergo changes in different production systems and soil management (PACHECO et al, 2016). Therefore, in areas infested by Oryza sativa, the use of distinct cultivation systems and crop rotation are highly recommended so as to manage this weed efficiently.…”

Section: Resultsmentioning

confidence: 99%

Weed phytosociological in irrigated rice under different cultivation systems and crop rotation intensity

et al. 2018

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This research aimed to evaluate the phytosociology of weeds in irrigated rice in different soil management systems and crop rotation intensity. Therefore, two field studies were carried out. Study 1 was conducted in an area that has been cultivated since 1994 with three cultivation systems: direct, pre-germinated and conventional ones. Study 2 was carried out in an experimental area in five Integrated Farming Systems, with crop rotation. Phytosociological evaluations were conducted when rice was fully blooming, in the first study, and when grain filling was ending, in the second study. Pre-germinated system of rice cultivation has predominance of aquatic weeds. Conventional system when compared with direct sowing has lower weed densities. Integrated Agricultural Production Systems with higher intensity of crop rotation have been higher infested of perennial species.

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“…Outro fator que pode ter contribuído para o elevado NPD no manejo com dessecação foi a grande quantidade de plantas da espécie Spermacoce latifolia, chegando a 924 plantas m -2 no tratamento de dessecação no pousio. Essa espécie é conhecida por ser tolerante a herbicidas (Pacheco et al, 2016), especialmente ao glyphosate, fazendo com que a dessecação apresentasse pouca eficiência sobre a planta daninha, o que proporcionou condições favoráveis ao seu estabelecimento.…”

Section: Cobertura Vegetalunclassified

“…A aplicação de herbicidas como o glyphosate e o uso de diferentes padrões desse herbicida podem exercer influência na composição florística das plantas daninhas (Santos et al, 2015) em que espécies resistentes ou tolerantes, como S. latifolia (Pacheco et al, 2016) podem se sobressair no ambiente.…”

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Fitossociologia de plantas daninhas em função de diferentes manejos de coberturas de inverno

et al. 2018

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Para aumentar a eficiência do uso das coberturas de solo é importante conhecer quais espécies apresentam maior supressão de plantas daninhas e se o método de manejo das coberturas afeta o efeito de supressão. Objetivou-se, com esse trabalho, avaliar o efeito supressivo de diferentes coberturas de inverno e de diferentes manejos dessas coberturas através de índices fitossociológicos. Para isso conduziu-se um experimento em esquema fatorial 4 × 3, em um delineamento experimental de blocos casualizados, com quatro repetições. O primeiro fator foi constituído por diferentes espécies de cobertura de solo: aveia branca (Avena sativa), nabo (Raphanus raphanistrum), ervilhaca (Vicia sativa) e pousio; o segundo fator foi constituído pelos manejos de cobertura: controle químico, acamamento e sem manejo. No momento do manejo das coberturas foi quantificada a massa seca das mesmas. A comunidade infestante foi avaliada aos 75 dias após o manejo das coberturas, com avaliação do número de plantas daninhas, massa seca de plantas daninhas, frequência relativa, densidade relativa, dominância relativa e índice de valor de importância (IVI). A aveia produz a maior quantidade de massa seca. A comunidade infestante é composta por 31 espécies. No manejo químico, as coberturas de aveia e ervilhaca são as que mais suprimem o número de plantas daninhas. De modo geral, a dessecação promove maior número de plantas daninhas, porém diminui a massa seca das mesmas. As espécies Spermacoce latifolia, Conyza bonariensis e Sida rhombifolia apresentam elevados valores de IVI. A dessecação das coberturas favorece espécies tolerantes a herbicidas a se sobressaírem no ambiente.

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Production systems and weed control in annual crops of the Cerrado area of the State of Piauí

Cited by 6 publications

References 8 publications

Morphological and Biochemical Study of Bidens pilosa on the Effects of Extract of Urochloa ruziziensis

Morphological and Biochemical Study of Bidens pilosa on the Effects of Extract of Urochloa ruziziensis

Weed phytosociological in irrigated rice under different cultivation systems and crop rotation intensity

Fitossociologia de plantas daninhas em função de diferentes manejos de coberturas de inverno

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