Crescimento do algodoeiro submetido ao herbicida trifloxysulfuron-sodium

Freitas, Rogério Soares de; Tomaz, Marcelo Antônio; Ferreira, Lino Roberto; Berger, Paulo Geraldo; Pereira, C.J.; Cecon, Paulo R.

doi:10.1590/s0100-83582006000100016

Cited by 7 publications

(5 citation statements)

References 4 publications

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“…For maize, the combined application of organo-phosphorate insecticides and sulfonylurea herbicides can reduce maize herbicide tolerance, resulting in smaller yields (Porpiglia et al, 1990;Morton et al, 1991). Application of trifloxysulfuron-sodium in early stages of cotton development reduced the accumulation of dry matter (Freitas et al, 2005a), whereas application under recommended rate and stage of development presented signs of phytotoxicity that affected crop cycle, and just temporarily the plant growth rate, which did not reduce cotton yield (Freitas et al, 2005b;Freitas et al, 2006).…”

Section: Phytotoxicity and Yield Lossesmentioning

confidence: 99%

Herbicide selectivity by differential metabolism: considerations for reducing crop damages

Carvalho¹,

Nicolai²,

Ferreira³

et al. 2009

Sci. agric. (Piracicaba, Braz.)

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Herbicide selectivity is an agricultural technology largely exploited in chemical strategies of weed control. The joint action of several protection mechanisms avoids phytotoxicity from herbicide treatment, maintaining the level of agronomically accepted damage to a minimum, or even totally avoiding them. The major mechanism of herbicide selectivity derives from the differential metabolism between weed and crop plant species, with weeds presenting a limited ability to perform it under agronomically recommended conditions. In this case, phytotoxicity can be interpreted as an overcoming of the maximum protection capacity offered by the mechanisms of selectivity, or when considering metabolism as the main factor, the overcoming of the inherent plant ability to detoxify a particular molecule. Considering that herbicide metabolism requires energy disposal, symptoms of phytotoxicity characterize an additional waste of energy that should not be accepted as a natural physiologic response; therefore it might result in yield losses. To avoid or minimize crop losses or damages, it is required that herbicide application recommendations are based on results from rigorously conducted selectivity experiments, as well as that there is an increase in the awareness of growers about the best use of each product. Key words: phytotoxicity, injuries, yield, experimental design, crop management SELETIVIDADE DE HERBICIDAS POR METABOLISMO DIFERENCIAL: CONSIDERAÇÕES PARA REDUÇÃO DE DANOS EM CULTURAS AGRÍCOLASRESUMO: A seletividade dos herbicidas é uma tecnologia agrícola que tem sido vastamente explorada nas estratégias de controle químico de plantas daninhas. É resultado da ação conjunta de diversos mecanismos que protegem a cultura da fitotoxicidade dos tratamentos herbicidas, mantendo-a com níveis de injúrias aceitáveis agronomicamente, ou mesmo na ausência destas. O principal mecanismo de seletividade dos herbicidas é o metabolismo diferencial desses produtos entre plantas daninhas e cultivadas, em que, nas situações de recomendação agronômica, as plantas daninhas são menos hábeis em realizá-lo. Neste caso, a fitotoxicidade pode ser entendida como a suplantação da capacidade máxima de proteção oferecida pelos mecanismos de seletividade ou, considerando o metabolismo como o principal mecanismo, como a superação da capacidade intrínseca da espécie em detoxificar determinada molécula. Considerando-se que o metabolismo de herbicidas envolve gasto de energia, os sintomas de fitotoxicidade caracterizam um segundo gasto energético que não deve ser aceito como uma resposta fisiológica natural, portanto pode resultar em perdas de rendimento das culturas. Para evitar ou minimizar as perdas ou injúrias às culturas, é necessário que as recomendações de herbicidas sejam baseadas em trabalhos de seletividade conduzidos com adequado rigor experimental; bem como é importante a conscientização dos agricultores quanto a melhor forma de utilizar cada produto. Palavras-chave: fitotoxicidade, injúrias, rendimento, delineamento experimental, man...

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Section: Phytotoxicity and Yield Lossesmentioning

confidence: 99%

Herbicide selectivity by differential metabolism: considerations for reducing crop damages

Carvalho¹,

Nicolai²,

Ferreira³

et al. 2009

Sci. agric. (Piracicaba, Braz.)

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“…Such continuous reduction of RGR TB can be explained by the growth of the plant, which implies greater expenditure with the maintenance of the structures, resulting in greater maintenance respiration. Another factor that contributed to the reduction in RGR TB was self-shading, whose importance increases with plant age (Freitas et al, 2006;Coelho, Freitas, Cunha, Dombroski, & Santana, 2013). In addition, in the final stage of the crop, there is a reduction in RGR TB due to the gradual increase of non-assimilatory tissues (Alvarez, Crusciol, & Nascente, 2012).…”

Section: Growth Evaluationmentioning

confidence: 99%

Nutrient support via fertigation with domestic effluent and growth of cotton

Filho

Neto

Fernandes

et al. 2020

SCA

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Because of climatic problems in the Brazilian semi-arid region, it is of fundamental importance to seek a culture that considers water scarcity and available natural resources. Thus, a randomized block design, with subdivided plots and six replications, was carried out in the experimental area of the treatment and wastewater reuse station of the Milagres Settlement, Apodi, Brazil, with the objective of evaluating cultivation of herbaceous cotton (Gossipyum hirsutum) fertigated with domestic sewage treated in a semi-arid environment. Two cultivation cycles were carried out, and the cotton plants were fed with three different solutions containing treated domestic sewage (TDE) plus supply water (PSW), to supply the crop evapotranspiration (ETc) (100% PSW – control, 50% PSW + 50% TDE and 100% TDE), with and without phosphate fertilization in pre-planting. The contribution of nutrients to the soil and plant growth were analyzed. The results indicated that the wastewater presents potential fertilizer, reaching to the soil amounts of some nutrients exceeding the cotton’s needs, when 100% of the ETc was supplied via fertigation with domestic effluent, resulting in an increase in the growth rates of the plants. There was no interaction between the percentages of wastewater and phosphate fertilization in pre-planting. Phosphorus alone promoted significant variation only in the first cycle, indicating that there is a residual fertigation effect with domestic effluent on the nutrient supply.

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“…The reduction of absolute and relative growth rates in the period of 81 to 100 DAE of cotton is explained by the fact that this period coincides with the flowering period and training of apples, which are effective plant drains (Freitas et al, 2006). At this stage, it is important to irrigate for HR 75% of evapotranspiration to soften these reductions.…”

Section: Sourcementioning

confidence: 99%

Cotton growth in response to water supply in red Latosol cerrado

Vidal¹,

Soares²,

Teixeira³

et al. 2018

Afr. J. Agric. Res.

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There are few studies that demonstrate the influence of water stress in biometric variables and cotton growth. Thus, the objective of this study was to evaluate different levels of water supply in the BRS 2 cotton growth, in the field of Campus Rio Verde-GO, in 2015. Experimental design used was randomized blocks, with three replications in a split-plot scheme of 5 x 4 with five water replacements (WR) (25, 50, 75, 100 and 125%) of evapotranspiration, and four times of evaluation (ET) during the growth cycle (40-60, 61-80, 81-100 and 1-20 days after emergence). The variables analyzed were plant height (PH), leaf area (LA), dry phytomass stem (DPS), dry phytomass of leaves (DPL), dry phytomass of reproductive organ (DPRO), dry phytomass of aerial part (DPAP), absolute growth rate (AGR), relative growth rate (RGR), net assimilation rate (NAR) and leaf area ratio (LAR). The behavior of PH and LA under the influence of water levels revealed that for a better performance of studied variables, it is important to consider the irrigation management, besides the crop coefficient. Water replacement influenced the cotton growth. Low cotton growth rate was caused by the reduction of water supply until the end of growth cycle.

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Crescimento do algodoeiro submetido ao herbicida trifloxysulfuron-sodium

Cited by 7 publications

References 4 publications

Herbicide selectivity by differential metabolism: considerations for reducing crop damages

Herbicide selectivity by differential metabolism: considerations for reducing crop damages

Nutrient support via fertigation with domestic effluent and growth of cotton

Cotton growth in response to water supply in red Latosol cerrado

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