Sensibilidade de cultivares de algodoeiro ao cloreto de mepiquat

Bogiani, Júlio César; Rosolem, Ciro Antônio

doi:10.1590/s0100-204x2009001000006

Cited by 19 publications

(11 citation statements)

References 14 publications

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“…Surveys with similar results were found by Bogiani and Rosolem (2009) and Ferrari et al (2008), which splits not treated with growth regulator had on average larger number of nodes on the stem compared to no treatment with regulator. According to the number of bolls per plant of cotton (Table 5) glyphosate application system caused no effects on cotton in any of the evaluation periods.…”

Section: Resultssupporting

confidence: 69%

“…The treatments with the application of growth regulators showed significant differences in the assessments at 60, 75, 90, 105, and 120 DAE of the plant, the first evaluation (45 DAE) was not significant, this fact can be explained because regulator applications started the same day of this assessment. In the other assessments reduction in the growth of the plant for treatment in which was governor applied occurred, because mepiquat chloride reduces the concentration of gibberellic acid plant by inhibiting its synthesis, this fact can be explained because the gibberellic acid is an hormone responsible for cell division and growth (Taiz and Zeiger, 2002), blocking or decreasing their synthesis causes a reduction in plant height (Bogiani and Rosolem, 2009).…”

Section: Resultsmentioning

confidence: 99%

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Sistemas de aplicação de subdoses de glyphosate e de regulador de crescimento em algodoeiro

et al. 2015

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-In order to increase productivity levels, reduce costs and improve efficiency in mechanical harvesting, new technologies are being incorporated such as governor use of growth and application of sub-dose of glyphosate with promising hormetic effect on cotton plants. To do this, this study aims to evaluate the effect of the application of sub-dose of glyphosate and growth regulator system on cotton agronomic characteristics. The experimental design was randomized blocks in a factorial 6 x 2 + 1, with four replications, the first factor was frequency of application of glyphosate, using the same dose (78 g a.e. ha -1 ) in one single time 40 days after emergency (DAE), split in 2 times (at 40 and 50 DAE), in 3 times (40, 50 and 60 DAE), in 4 times (40, 50, 60 and 70 DAE) and 5 times (40, 50, 60, 70 and 80 DAE) , and the second factor was with and without the application of mepiquat chloride in the dose 1 L ha -1 , with split spraying in 5 times, at 45, 55, 65, 75, 85 DAE, besides the control without application of products. It has been found that the use of mepiquat chloride reduced the plant height and the number of nodes of the stem. The split application of sub-dose of the herbicide in 3 times led to increased cotton yield compared to treatments without application. Keywords: hormesis; mepiquat chloride; herbicide Resumo -Com o intuito de aumentar os índices de produtividade, reduzir os custos de produção e melhorar a eficiência na colheita mecanizada, novas tecnologias vêm sendo incorporadas como o uso regulador de crescimento e aplicação de subdose de glyphosate com promissor efeito hormético nas plantas de algodão. Para tal, objetivou-se com o trabalho avaliar o efeito do sistema de aplicação de subdose de glyphosate e de regulador de crescimento nas características agronômicas do algodoeiro. O delineamento experimental foi de blocos ao acaso em um esquema fatorial 6 x 2 + 1, com 4 repetições, sendo o primeiro fator frequência de aplicação do glyphosate, utilizando-se a mesma dose (78 g e.a. ha -1 ) em 1 única vez aos 40 dias após emergência (DAE), parcelada em 2 vezes (aos 40 e 50 DAE), em 3 vezes (40, 50 e 60 DAE), em 4 vezes (40, 50, 60 e 70 DAE) e 5 vezes (40, 50, 60, 70 e 80 DAE) , e o segundo fator foi com e sem aplicação de cloreto de mepiquat na dose 1 L ha -1 , com pulverização parcelada em 5 vezes, aos 45, 55, 65, 75, 1

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Section: Resultssupporting

confidence: 69%

Section: Resultsmentioning

confidence: 99%

Sistemas de aplicação de subdoses de glyphosate e de regulador de crescimento em algodoeiro

et al. 2015

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“…The effects of mepiquat chloride (MC) on cotton plant are dependent on several factors, such as temperature, row spacing and plant density, sowing season, cultivar and fertilization (Bogiani & Rosolem, 2009). Cotton plants treated with MC are typically more compact, with fewer nodes (Reddy et al, 1990), shorter internodes and fewer reproductive branches.…”

Section: Introductionmentioning

confidence: 99%

Growth and cotton yield over row spacing and growth regulator

Ferrari

Júnior

Ferrari

et al. 2014

Agraria

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Growth regulators and row spacing are an alternative to be considered and planned together and it consists in an effective technology in the establishment most profitable cotton crop. The main objective of this work was to evaluate the influence of row spacing in cotton crops and applications forms of growth regulator on components of cotton growth, production and yield Key words: agronomic characteristics, Gossypium hirsutum, mepiquat chloride, yield components Crescimento e produtividade do algodoeiro em função de espaçamentos e aplicação de regulador de crescimento RESUMO A utilização de reguladores de crescimento aliada ao espaçamento entrelinhas é uma das alternativas que se constitui em uma tecnologia eficaz no estabelecimento de lavouras algodoeiras mais lucrativas. O objetivo deste trabalho foi avaliar a influência de diferentes espaçamentos de semeadura do algodoeiro submetidos às formas de aplicação de regulador de crescimento nos componentes de crescimento, da produção e produtividade. O delineamento experimental empregado foi o de blocos ao acaso, disposto em faixas, composto por espaçamentos entrelinhas na semeadura: 0,45, 0,70 e 0,90 m; manejo de regulador de crescimento (cloreto de mepiquat -CM) parcelado em quatro aplicações aos 35, 45, 55 e 65 dias após a emergência (D.A.E.), única aos 70 D.A.E. e sem aplicação. A aplicação de regulador de crescimento, seja na forma única ou parcelada, diminui o desenvolvimento em altura das plantas e de diâmetro do caule. Menores valores para diâmetro do caule, número de capulhos e massa de 20 capulhos, foram encontrados com a utilização de espaçamento adensado de 0,45 m e maiores produtividades de algodão em caroço foram encontradas com aplicação parcelada de CM e pelo uso de espaçamento entrelinhas adensado na semeadura.Palavras-chave: características agronômicas, Gossypium hirsutum, cloreto de mepiquat, componentes de produção

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“…In many cases, the expected results have not been achieved following the recommendations (Bogiani and Rosolem 2009). Many sunflower cultivars show low predictability after application of these compunds mainly due to genotypic differences and their phyto-regulator sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Growth regulators for reduction of height in potted red-yellow sunflower Helianthus annuus cv. 'Florenza'

Suzuki¹,

Brazil²,

Alves³

et al. 2018

Aust J Crop Sci

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The market for flowers and ornamental plants has been growing in Brazil. In this context, sunflower has been increasing its importance mainly as a cut flower. There are cultivars of distinct colors and shapes, but sunflower is a very high flower to be selled in pots. The objective of this research was to evaluate the effect of the growth regulators such as mepiquat chloride and paclobutrazol in the height reduction of the Sunflower known as 'Florenza' to be used it in potted flower. We adopted a completely randomized design in a 2x5 factorial scheme with 11 treatments and ten repetitions. In five samples, the mepiquat chloride (0, 2, 4, 6, 8, 10 L ha ) were applied. The applications were repeated at 15, 30 and 45 days after sowing. The plant height, stem diameter, intern diameter of the main capitulum, number of leaves and capitula, dry mass of leaves, stem, capitula and root, leaf area and chlorophyll content were evaluated. The concentration of 10 L ha -1 of mepiquat chloride was the most effective dose in reducing the height of a red-yellow 'Florenza' sunflower showing a height 43.2 cm smaller than the one from the control treatment.

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Sensibilidade de cultivares de algodoeiro ao cloreto de mepiquat

Cited by 19 publications

References 14 publications

Sistemas de aplicação de subdoses de glyphosate e de regulador de crescimento em algodoeiro

Sistemas de aplicação de subdoses de glyphosate e de regulador de crescimento em algodoeiro

Growth and cotton yield over row spacing and growth regulator

Growth regulators for reduction of height in potted red-yellow sunflower Helianthus annuus cv. 'Florenza'

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