Reguladores vegetais para o manejo do porte da mamoneira IAC 2028
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2013-12-06
Autores
Souza-Schlick, Genivaldo David de [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Para a colheita mecanizada, é desejável que as plantas de mamona tenham porte reduzido. Uma alternativa para reduzir o porte da mamoneira é o uso de reguladores de crescimento vegetal, porém, praticamente são inexistentes as informações sobre os efeitos do uso de reguladores vegetais na cultura da mamona. Dessa forma, objetivou-se com o presente trabalho avaliar os efeitos dos reguladores vegetais cloreto de mepiquat (Pix HC®), cloreto de chlormequat (Tuval®) e trinexapac-etil (Moddus®), aplicados em diferentes épocas, doses, modos e com adição de adjuvante, no crescimento e na produtividade da mamoneira cv. IAC 2028. Foram realizados nove experimentos, sendo quatro em casa de vegetação (experimento I, II, III e IV) e cinco em campo (experimento V, VI, VII, VIII e IX). Todos os experimentos foram conduzidos em blocos ao acaso e quatro repetições. Os experimentos I, II e III, um com cada regulador de crescimento, foram constituídos por um esquema fatorial 4x2, sendo quatro doses e duas épocas de aplicação. No experimento IV, utilizou-se um esquema fatorial 3x2+1, sendo os três reguladores de crescimento, combinados com adição ou não de adjuvante (espalhante adesivo) à calda, e uma testemunha (sem aplicação de regulador ou adjuvante). Nos experimentos V, VI e VII, um com cada regulador de crescimento, utilizou-se o esquema fatorial 5x3, sendo cinco doses e duas épocas de aplicação. Nos experimentos VIII e IX, utilizou-se o esquema fatorial 2x3+1, sendo duas doses, três modos de aplicação e uma testemunha (sem aplicação). A aplicação de cloreto de mepiquat reduziu o número de folhas, a área foliar e o acúmulo de matéria seca e aumentou a relação parte aérea/raiz nas plantas de mamona, especialmente quando aplicado na fase vegetativa (33 dias após emergência (DAE)). Porém, o efeito desse produto na redução da altura das plantas foi 2 mais pronunciado quando o...
For mechanized harvesting, it is desirable that the castor plants have reduced size. An alternative which may be to have the application to reduce the size of the castor plant is the use of plant growth regulators, however, are virtually non-existent information about the effects of plant growth regulators in the castor crop. Thus, the aim of the present study was to evaluate the effects of plant growth regulators mepiquat chloride (Pix HC®), chlormequat chloride (Tuval®), and trinexapac-ethyl (Moddus®), applied at different times, rates, forms, and with adjuvant addition on growth and yield of castor cultivar IAC 2028. Nine experiments were performed, including four in a greenhouse (I, II, III, and IV) and five on the field condition (experiment V, VI, VII, VIII, and IX). All experiments were conducted in a randomized block design with four replications. The experiments I, II, and III, one with each plant growth regulator, consisted of a 4x2 factorial scheme, represented by four rates and two application times. In the experiment IV, a 3x2+1 factorial scheme, represented by three plant growth regulators, with and without adjuvant (spreader-sticker) to spray solution, and a control (without plant growth regulator or adjuvant application) was used. In the experiments V, VI, and VII, a 5x3 factorial scheme, consisted of four rates and two application times was used. The experiments VIII and IX were consisted by a 2x3+1 factorial scheme, represented by two rates, three forms of application, and a control (without application). Mepiquat chloride application reduced the number of leaves, leaf area and dry matter accumulation and increased the root/shoot ratio in castor plants, especially when applied in the vegetative phase (33 days after emergence (DAE)). However, the effect of this product in reducing plant height was more pronounced when it was applied from the beginning of the reproductive ...
For mechanized harvesting, it is desirable that the castor plants have reduced size. An alternative which may be to have the application to reduce the size of the castor plant is the use of plant growth regulators, however, are virtually non-existent information about the effects of plant growth regulators in the castor crop. Thus, the aim of the present study was to evaluate the effects of plant growth regulators mepiquat chloride (Pix HC®), chlormequat chloride (Tuval®), and trinexapac-ethyl (Moddus®), applied at different times, rates, forms, and with adjuvant addition on growth and yield of castor cultivar IAC 2028. Nine experiments were performed, including four in a greenhouse (I, II, III, and IV) and five on the field condition (experiment V, VI, VII, VIII, and IX). All experiments were conducted in a randomized block design with four replications. The experiments I, II, and III, one with each plant growth regulator, consisted of a 4x2 factorial scheme, represented by four rates and two application times. In the experiment IV, a 3x2+1 factorial scheme, represented by three plant growth regulators, with and without adjuvant (spreader-sticker) to spray solution, and a control (without plant growth regulator or adjuvant application) was used. In the experiments V, VI, and VII, a 5x3 factorial scheme, consisted of four rates and two application times was used. The experiments VIII and IX were consisted by a 2x3+1 factorial scheme, represented by two rates, three forms of application, and a control (without application). Mepiquat chloride application reduced the number of leaves, leaf area and dry matter accumulation and increased the root/shoot ratio in castor plants, especially when applied in the vegetative phase (33 days after emergence (DAE)). However, the effect of this product in reducing plant height was more pronounced when it was applied from the beginning of the reproductive ...
Descrição
Palavras-chave
Mamona – Colheita, Mamona, Reguladores de crescimento, Plantas - Reguladores, Crescimento (Plantas), Plantas - Efeito dos cloretos, Plants, Effect of chlorides on
Como citar
SOUZA-SCHLICK, Genivaldo David de. Reguladores vegetais para o manejo do porte da mamoneira IAC 2028. 2013. xvi, 128 f. Tese (doutorado) - Universidade Estadual Paulista, Júlio de Mesquita Filho, Faculdade de Ciências Agronômicas de Botucatu, 2013.