Efeitos de maturadores nas características tecnológicas da cana-de-açúcar com e sem estresse hídrico

Almeida, José Carlos Vieira de; Leite, Célio R. F.; Souza, José Roberto Pinto de

doi:10.5433/1679-0359.2005v26n4p441

Cited by 6 publications

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“…Comumente administrados no início da safra, os maturadores também poderiam ser administrados no meio e final da safra, buscando-se melhorar a qualidade da matéria-prima em caso de condições climáticas não favoráveis à maturação natural ou ampliar o período de moagem aliado à garantia de fornecimento de matéria-prima de qualidade à indústria A aplicação de maturadores tem propiciado, mesmo sob condições climáticas desfavoráveis ao processo de maturação, a industrialização de matéria-prima de qualidade (ALMEIDA; LEITE; SOUZA, 2005;LEITE et al, , 2009. Dentre os agentes químicos utilizados como maturadores destacam-se o etefon, o etil-trinexapac, o glifosato e o sulfometuron metil.…”

Section: Introductionunclassified

Desenvolvimento e produtividade da cana-de-açúcar após aplicação de reguladores vegetais em meio de safra

2011

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ResumoO fornecimento de matéria-prima de qualidade tecnológica que garanta retorno econômico é uma das maiores necessidades da indústria sucroalcooleira. O objetivo do trabalho foi avaliar o desenvolvimento e a produtividade de colmos de cana-de-açúcar decorrente da aplicação de reguladores vegetais no meio da safra. O delineamento experimental utilizado foi o de blocos casualizados, com cinco repetições. Foram utilizados cinco tratamentos constituídos pela aplicação dos reguladores vegetais da classe dos retardantes de crescimento etefon e etil-trinexapac, e de KNO 3 e KNO 3 + Boro e uma testemunha (maturação natural). O etil-trinexapac e o etefon atuaram de forma eficiente em retardar o processo de crescimento em altura das plantas de cana-de-açúcar, sem ocasionar alterações no diâmetro dos colmos. A manutenção da integridade da gema apical possibilitou o incremento no diâmetro dos colmos sem interromper o crescimento em altura das plantas. Os maturadores propiciaram, conforme a época de aplicação, melhoria na qualidade tecnológica da matéria-prima. Ainda, não afetaram o número de colmos na colheita, não produziram alterações quantitativas na massa de colmos por hectare, e não afetaram a rebrora da soqueira da cana-de-açúcar. Palavras-chave: Saccharum spp., maturadores, etefon, etil-trinexapac, biometria, produção AbstractThe supply of technological quality raw material for providing economical return is the most important necessity of sugar and alcohol industry. The objective of this work was to evaluate the development and productivity of sugarcane stalks due to plant regulators application at half crop. The experiment was carried out in a randomized block design with five replications. The treatments consisted of four plant regulators of the class of the growth retainers (Ethephon, Ehyl-trinexapac, Potassium nitrate, Potassium nitrate + Boron) application and a control (natural ripening). Ethyl-trinexapac and Ethephon treatments were efficient to hold up growth process regarding height of plants, but had no effect on diameter of stalks. The maintenance of bud top integrity made possible the increase in diameter of stalks, without interrupting the growth process regarding height of plants. According to application time the ripeners provided improvement on technological quality of raw material. The ripeners did not affect the number of plants per meter at harvest and did not cause quantitative alterations in the mass of stalks per hectare. The ripeners did not affect the regrowth of the ratoon cane.

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Section: Introductionunclassified

Desenvolvimento e produtividade da cana-de-açúcar após aplicação de reguladores vegetais em meio de safra

2011

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“…Herb., v.14, n.2, p.164-170, abr./jun. 2015 height of plants that received ethephon was similar or lower than the control treatment and did not render any benefit in the production of said plants. According to Shekoofa and Emam (2008), the application of ethephon in corn plants has better effects in enhancing the crop performance in conditions of water deficiency, although they emphasize that further studies need to be carried out.…”

Section: Resultsmentioning

confidence: 88%

“…Similar results were described by Pires et al (2013) in eucalyptus plants subjected to ethephon drift simulation. Almeida et al (2005) assessed the effect of ethephon on sugarcane cultivation and did not note any significant differences in this ripener when compared to those witnessed for Pol%, fiber content and brix. The same authors, as well as Hida et al (2009), attribute the main cause of a lack of response to the existence of conditions that promote the natural ripening of sugarcane, besides the time of year and application conditions.…”

Section: Resultsmentioning

confidence: 94%

“…The same authors, as well as Hida et al (2009), attribute the main cause of a lack of response to the existence of conditions that promote the natural ripening of sugarcane, besides the time of year and application conditions. The fact that the corn crop had been in second harvest and the low rainfall (Figure 1) during the period of both applications may be mitigated the possible effects of ethephon subdoses on the corn plants, since under drier conditions the effect some ripeners are minimized (Almeida et al 2005).…”

Section: Resultsmentioning

confidence: 99%

“…There have been several studies on ethephon, as ripener (Almeida et al, 2005;Meschede et al, 2009), flowering inhibitor (Araldi et al, 2010), in relation to sugarcane ratoon resprout and yield , the development and yield of sugarcane stalks (Leite et al, 2011), tillering and yield of ratoon cane (Silva et al, 2007), fruit ripening (Braz et al , 2008;Silva et al, 2011b) and growth regulator (Zhang et al, 2014). However, studies on the effect caused by sub-doses of ethephon in corn crops and the description of phytotoxicity symptoms in the field have not yet been performed.…”

Section: Introductionmentioning

confidence: 99%

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Subdoses do ácido 2-cloroetilfosfônico em estádios vegetativos da cultura do milho

Felisberto¹,

Felisberto²,

Ramos³

et al. 2015

RBHerbicidas

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-The use of ripeners has been common practice in sugarcane cultivation. The application of these products is often performed through aerial spraying, which increases the chances of molecules from the ripener drifting into other crops, such as corn. With the aim of studying possible phytointoxication in corn caused by ethephon drift, a field experiment was conducted in order to evaluate the effect of ripener sub-dosing when applied in the V4 and V8 development stages of corn cultivation. The experiment was set up in a randomized block design, with four replications. Treatments were arranged in a 2 x 5 factorial scheme, with first factor corresponding to the corn growth stages in which the ripener was applied (V4 and V8), and the second factor referred to the ethephon sub-doses (0; 14.26; 28.51; 42.77, and 57.02 g ha -1 a.i.). Visual phytotoxicity effects were not perceptible when sub-doses were applied in the V4 and V8 corn growth stages. Similarly, agronomic characteristics and grain yield were not altered by ethephon sub-doses of up to 57.02 g ha -1 a.i. Keywords: simulated drift; ethephon; phytotoxicity; Zea mays Resumo -O uso de maturadores tem sido prática comum na cultura da cana-de-açúcar. A aplicação destes produtos ocorre muitas vezes por meio de pulverização aérea, o que aumenta as chances de ocorrer deriva das moléculas do maturador em outras culturas, como o milho. Visando estudar possíveis fitointoxicações no milho ocasionadas por deriva de ethephon, foi realizado um experimento em campo com o objetivo de avaliar o efeito de subdoses do maturador quando aplicado nos estádios de desenvolvimento V4 e V8 da cultura do milho. O experimento foi instalado no delineamento com blocos casualizados, com quatro repetições. Os tratamentos foram arranjados em esquema fatorial 2 x 5, com primeiro fator correspondente aos estádios de desenvolvimento do milho em que foi aplicado o maturador (V4 e V8) e o segundo fator foi referente às subdoses de ethephon (0; 14,26; 28,51; 42,77

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Effect of trinexapac-ethyl on sugarcane varieties

Lima¹,

Alvarez²,

Neto³

et al. 2019

Biosci. J.

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Growth regulators have been widely employed as maturation inducers in the sugarcane crop, as an agricultural strategy. However, the response of varieties to the use of these compounds has been poorly studied, mainly in cerrado (savannah-like biome) areas occupied by the crop. This study was carried out to examine the effects of trinexapac-ethyl on important morphological characteristics of sugarcane varieties. The experiment was set up as a randomized block design with a 4 × 2 factorial arrangement consisting of four varieties (RB83-5054, SP80-1816, RB96-6928, and RB85-5156) associated or unassociated with application of trinexapac-ethyl (375 g L-1 of the a.i. ha-1), with four replicates. The ripener was applied at 126, 178, and 228 days after planting (DAP) the first-cycle sugarcane, using the dose of 125 g L-1 a.i. ha-1 per application. Upon harvest, which occurred at 243 DAP, we determined the number of stalks per meter, weight of 30 stalks without top, internode length, number of internodes per stalk, and yield of sugarcane stalks. Ripener application increased the number of stalks in varieties RB96-6928 and RB83-5054 and the weight of 30 stalks in varieties RB96-6928 and RB83-5054 and SP80-1816; reduced internode length in varieties RB85-5156 and RB83-5054; and increased stalk yield per hectare in varieties RB96-6928 and RB83-5054, but did not increase the number of internodes per stalk in any of the tested varieties. The variables number of stalks, stalk weight, internode length, and stalk yield responded in a genotype-dependent manner to the application of trinexapac-ethyl.

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Efeitos de maturadores nas características tecnológicas da cana-de-açúcar com e sem estresse hídrico

Cited by 6 publications

References 1 publication

Desenvolvimento e produtividade da cana-de-açúcar após aplicação de reguladores vegetais em meio de safra

Desenvolvimento e produtividade da cana-de-açúcar após aplicação de reguladores vegetais em meio de safra

Subdoses do ácido 2-cloroetilfosfônico em estádios vegetativos da cultura do milho

Effect of trinexapac-ethyl on sugarcane varieties

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