Perdas de cloreto de mepiquat no algodoeiro por chuva simulada

Mateus, Gustavo Pavan; Lima, Eduardo do Valle; Rosolem, Ciro Antônio

doi:10.1590/s0100-204x2004000700003

Cited by 12 publications

(20 citation statements)

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“…Geralmente, os reguladores são aplicados com a finalidade de aumentar a produção e a qualidade ou facilitar a colheita (LAMAS, 2001;MATEUS et al, 2004;FERRARI et al, 2008). Os reguladores atuam como sinalizadores químicos na regulação do crescimento e desenvolvimento de plantas.…”

Section: Introdução Introdução Introduçãounclassified

Efeitos de reguladores de crescimento na elongação do colmo de trigo

Espindula¹,

Rocha²,

Souza³

et al. 2010

Acta Sci. Agron.

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RESUMO. Objetivou-se com este trabalho avaliar o efeito de doses e épocas de aplicação de três reguladores de crescimento na elongação do colmo de plantas de trigo. O experimento, conduzido em Viçosa, Estado de Minas Gerais, de maio a setembro de 2005, foi instalado com tratamentos em esquema fatorial e hierárquico com uma testemunha, no delineamento em blocos casualizados com quatro repetições. Os tratamentos foram 500; 1.000 e 1.500 g ha -1 de clormequat; 62,5; 125,0 e 187,5 g ha -1 de trinexapac-etil e 40; 80 e 120 g ha -1 de paclobutrazol, aplicados no estádio 6 ou 8 da escala Feeks e Large, e uma testemunha. O comprimento do colmo com trinexapac-etil foi menor do que com o clormequat, que, por sua vez, foi menor do que com o paclobutrazol. A aplicação de reguladores na época 1 promoveu maior redução dos entrenós basais, enquanto a aplicação na época 2 proporcionou maior influência no pedúnculo. O aumento das doses de clormequat e trinexapac-etil promoveu redução do comprimento do colmo e das partes que o formam. O aumento das doses de paclobutrazol promoveu respostas pouco expressivas no colmo e seus componentes. Palavras-chave:Triticum aestivum L., clormequat, trinexapac-etil, paclobutrazol. ABSTRACT. Effect of growth regulators on wheat stem elongation.The objective of this work was to evaluate the effect of doses and times of application of three growth regulators on wheat stem elongation. The experiments were conducted in Viçosa, Minas Gerais State, from May to September 2005, in a factorial and hierarchical randomized block design with four repetitions and a control treatment. Treatments consisted of 500, 1000 and 1500 g ha -1 of chlormequat; 62.5, 125.0 and 187.5 g ha -1 of trinexapac-ethyl and 40, 80 and 120 g ha -1 of paclobutrazol, applied either at the 6 or 8 stage of the Feeks and Large scale, with a control. Stem length with trinexapac-ethyl was smaller than with chlormequat, which was in its turn smaller than with paclobutrazol. Application of growth regulators at stage 1 produced shorter basal internodes, whereas the stage 2 application caused greater reduction in the peduncle. The increase in chlormequat and trinexapac-ethyl doses reduced length of stem and its parts. The increase in paclobutrazol doses had very small effects on wheat growth and its parts.

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Section: Introdução Introdução Introduçãounclassified

Efeitos de reguladores de crescimento na elongação do colmo de trigo

Espindula¹,

Rocha²,

Souza³

et al. 2010

Acta Sci. Agron.

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show abstract

“…Growth retardants are natural or synthetic chemical substances that can be directly applied on plants to alter structural or vital processes by modifying hormone balance to increase yield, improve quality or facilitate harvesting (Lamas, 2001;Mateus et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Use of growth retardants in wheat

et al. 2009

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-In general, lodging has been controlled by restricting nitrogen fertilizer application and/or using short cultivars. Growth retardants can also be used to solve this problem.The objective of this study was to evaluate the effect of rates and application times of three growth retardants on Pioneiro wheat cultivar. The trial was carried out in Viçosa-MG, from May to September 2005, in a factorial and hierarchical scheme, in a randomized block design with four replications and a control treatment. The treatments consisted of 500, 1,000 and 1,500 g ha -1 of chlormequat; 62.5, 125 and 187.5 g ha -1 of trinexapacethyl and 40, 80 and 120 g ha -1 of paclobutrazol applied at growth stages 6 or 8, growth stage used on the scale of Feeks and Large, and a control treatment without growth retardant application. Only trinexapac-ethyl and chlormequat were efficient in reducing plant height; the effect of chlormequat and paclobutrazol on plant height was independent of the application time, but the trinexapac-ethyl at growth stage 8 produced shorter plant height than at stage 6. Increasing growth retardant rates produced shorter plant heights; chlormequat and paclobutrazol did not affect grain yield. However, the highest trinexapac-ethyl rates reduced wheat yield.

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“…According to Acta Scientiarum. Agronomy Maringá, v. 37, n. 3, p. 361-366, July-Sept., 2015 Mateus et al (2004), the activity of mepiquat chloride via foliar application to the cotton plants requires a minimum of 16 hours for the full effect of the product, and if there is rain during this period, an additional new application is then required. Studies indicate that growth regulators can alternatively be applied to the seeds, with the advantages of an easier practical application and the reduction of the cotton plants' initial development after emergence (FERRARI et al, 2010;NAGASHIMA et al, 2005), without affecting root system development (ALMEIDA; ROSOLEM, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Studies indicate that growth regulators can alternatively be applied to the seeds, with the advantages of an easier practical application and the reduction of the cotton plants' initial development after emergence (FERRARI et al, 2010;NAGASHIMA et al, 2005), without affecting root system development (ALMEIDA; ROSOLEM, 2012). Another favorable aspect is protection against adverse conditions during the first application of the growth regulator, which can prevent the product from producing the desired results (MATEUS et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

<b>Vegetative growth response of cotton plants due to growth regulator supply via seeds

et al. 2015

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ABSTRACT. The global cotton industry is distinguished by its numerous industrial uses of the plume as well as by high production costs. Excessive vegetative growth can interfere negatively with productivity, and thus, applying growth regulators is essential for the development of the cotton culture. The objective of this study was to evaluate the development and yield of the cotton cultivar FMT 701 with the application of mepiquat chloride to seeds and leaves. The experimental design used a randomized block design with four replications, arranged in bands. The treatments consisted of mepiquat chloride rates (MC) (0, 4, 6, 8 and 10 g a.i. kg -1 of seeds) applied directly to the cotton seeds and MC management by foliar spray using a 250 mL ha -1 rates that was administered under the following conditions: divided into four applications (35, 45, 55 and 65 days after emergence); as a single application at 70 days; and without the application of the product. The mepiquat chloride applied to cotton seeds controls the initial plant height and stem diameter, while foliar application reduces the height of the plants. After application to seed, foliar spraying MC promotes increase mass of 20 bolls, however no direct influence amount bolls per plant and yield of cotton seed. Higher cotton seed yield was obtained with a rate of 3.4 g a.i. MC kg -1 seeds.Keywords: mepiquat chloride, growth, yield components.Resposta do crescimento vegetativo do algodoeiro em relação à aplicação de regulador de crescimento via sementes RESUMO. A indústria mundial do algodão distingui-se por suas numerosas utilizações industriais da pluma, bem como pelos elevados custos de produção. Crescimento vegetativo excessivo pode interferir negativamente na produtividade e, por conseguinte, a aplicação de reguladores de crescimento é essencial para o desenvolvimento da cultura do algodão. O objetivo deste estudo foi avaliar o desenvolvimento e a produtividade do algodoeiro cultivar FMT 701 em função de aplicação de cloreto de mepiquat via sementes e folhas. O delineamento experimental utilizado foi de blocos ao acaso com quatro repetições, dispostos em faixas. Os tratamentos consistiram de doses de cloreto de mepiquat (CM) (0, 4, 6, 8 e 10 g ia kg -1 de sementes) aplicadas diretamente nas sementes de algodão e do manejo de CM via pulverização foliar na dose de 250 mL ha -1 da seguinte forma: divididos em quatro aplicações (35, 45, 55 e 65 dias após a emergência), como uma única aplicação, aos 70 dias, e sem a aplicação do produto. O cloreto de mepiquat aplicado via sementes de algodão controla a altura inicial das plantas e o diâmetro do caule, enquanto que a aplicação foliar reduz a altura das plantas. Após aplicação nas sementes, pulverização foliar de CM promoveu aumento da massa de 20 capulhos, no entanto não promoveu influência na quantidade de capulhos por planta e na produtividade de algodão em caroço. Maior rendimento de algodão em caroço foi obtido com dose de 3,4 g ia de CM kg -1 de sementes.Palavras-chave: cloreto de mepiquat, crescimento, com...

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Perdas de cloreto de mepiquat no algodoeiro por chuva simulada

Cited by 12 publications

References 13 publications

Efeitos de reguladores de crescimento na elongação do colmo de trigo

Efeitos de reguladores de crescimento na elongação do colmo de trigo

Use of growth retardants in wheat

<b>Vegetative growth response of cotton plants due to growth regulator supply via seeds

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