Efeito Da Irrigação No Rendimento E Qualidade De Fibras Em Cultivares De Algodoeiro Herbáceo

Zonta, J. H.; Bezerra, J. R. C.; Sofiatti, Valdinei; Farias, F. J. C.; Carvalho, Luiz Paulo de

doi:10.1590/1983-21252015v28n405rc

Cited by 26 publications

(28 citation statements)

References 10 publications

(11 reference statements)

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“…The group formed by genotypes CNPA 200210575, CNPA 200210576, CNPA 20063667, CNPA 20063334, and CNPA 2002 10327 stood out for STR, surpassing all the other genotypes and controls. Similar results were found by Carvalho et al (2015b), Zonta et al (2015b), and Cordão Sobrinho et al (2015), using irrigation depths similar to the ones we assessed.…”

Section: Variation Source Df ---------------------------Average Squarsupporting

confidence: 92%

“…The lowest MIC was expressed by the control BRS Verde (2.95 µg in −1 ), followed by the genotype CNPA 2002 10245 (4.12 µg in −1 ). These results exceeded those found by Cordão Sobrinho et al (2015) and Zonta et al (2015b), while Carvalho et al (2015b) observed micronaire estimates ranging from 2.70 to 4.25 µg in −1 when using the irrigation regime recommended for cotton.…”

Section: Variation Source Df ---------------------------Average Squarcontrasting

confidence: 48%

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Estimates of Genetic Parameters for Selection of Colored Cotton Fiber1

Albuquerque

Cavalcanti²,

Farias³

et al. 2020

Rev. Caatinga

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Naturally-colored cotton fiber has received attention from breeding programs in the semiarid region of northeastern Brazil due to an increased interest in its fibers. Therefore, this study aimed to select genotypes of colored cotton fiber for agronomic and technological fiber characteristics for the Brazilian semi-arid conditions. The experiment was carried out in two environments (Patos-PB and Apodi-RN) in Brazil during the 2016 growing season. The experimental design was in randomized blocks with four replications. Treatments consisted of eleven colored fiber genotypes and three controls (BRS Topázio, BRS Rubi, and BRS Verde). The following traits were assessed: seed cotton yield (SCY, kg ha-1), lint percentage (LP, %), lint length (LEN, mm), lint strength (STR, gf tex-1), and lint micronaire (MIC, µg in-1). The data were submitted to individual and joint variance analyses, and means were grouped by the Scott and Knott (1974) test at 0.05 probability. Genotypes showed variability in all traits, which allows genetic gains in subsequent cycles of selection. The genotypes BRS Topázio, CNPA 2002 10245, and CNPA 2002 10327 presented the best estimates for the assessed traits, thus they can be selected for future studies in cotton breeding programs in the semiarid region.

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Section: Variation Source Df ---------------------------Average Squarsupporting

confidence: 92%

Section: Variation Source Df ---------------------------Average Squarcontrasting

confidence: 48%

Estimates of Genetic Parameters for Selection of Colored Cotton Fiber1

Albuquerque

Cavalcanti²,

Farias³

et al. 2020

Rev. Caatinga

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“…Several studies have been conducted, showing that prolonged water deficit during the cotton cultivation cycle affects growth, productivity, and quality of the fibers (SNOWDEN et al, 2013;ZONTA et al, 2015a, ZONTA et al, 2015b.…”

Section: Introductionmentioning

confidence: 99%

Cotton Response to Water Deficits at Different Growth Stages

et al. 2017

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-Water deficit at certain cotton growth stages can cause severe damage to crop development, affecting physiological processes and reducing reproductive structures, with consequent yield losses. The objective of this study was to evaluate the response of cotton cultivars under water deficit applied at different stages of the crop cycle. We compared the number of bolls per meter, cotton yield, and water use efficiency for eight different cotton cultivars under a water deficit of 15 days. We selected the following growth stages: Emergence (EM), First Square (FS), First Flower (FL), Peak Bloom (PB), and First Open Boll (FOB). The control treatment was irrigated with 100% ETc. The experiment was conducted in Apodi, RN State of Brazil, semiarid region, using a sprinkler irrigation system. The number of bolls per meter, cotton yield, and water use efficiency were influenced by the interaction of cultivars x deficit periods. Lowest values were observed for water suppression in the FL and PB stages. When the water deficit was imposed in the initial stages of growth (EM to FS) or after the FOB stage, the cotton yield reduction was not significant. At the same stage and water deficit, the behavior of the different cultivars was similar. Producers are urged to take this information into account when developing irrigation schemes for cotton crops, thereby avoiding water deficits during the most critical periods of the crop cycle.Key words: Irrigation Management. Shedding. Semiarid. RESPOSTA DO ALGODOEIRO AO DÉFICIT HÍDRICO EM DIFERENTES FASES DE CRESCIMENTORESUMO -O déficit hídrico em determinadas fases do ciclo de cultivo do algodoeiro pode causar severos danos, afetando as estruturas reprodutivas, acarretando perda na produtividade. O objetivo deste trabalho foi avaliar a resposta de cultivares de algodoeiro submetidas ao déficit hídrico em diferentes fases do ciclo de cultivo. Comparou-se o número de capulhos por metro, a produtividade e a eficiência no uso da água em oito cultivares de algodoeiro herbáceo, submetidas a déficit hídrico por 15 dias nos estádios: emergência, emissão do primeiro botão floral, emissão da primeira flor, emissão da primeira maçã, abertura do primeiro capulho e a testemunha irrigada com 100% da ETc. O experimento foi instalado no município de Apodi-RN, região Semiárida do Nordeste, em área irrigada por aspersão. O número de capulhos por metro, a produtividade de algodão em caroço e a eficiência de uso da água foram influenciadas pela interação cultivares x déficit hídrico. Os piores resultados foram observados para o déficit hídrico de 15 dias após a emissão da primeira maçã e da primeira flor. Quando o déficit hídrico foi imposto nas fases de crescimento inicial, após a emissão do primeiro botão floral e após a abertura do primeiro capulho, a perda de produtividade não foi significativa. Dentro de um mesmo período de déficit hídrico, as cultivares se comportaram de maneira similar. Os produtores devem levar essa informação em consideração para ouso da irrigação suplementar e para progr...

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“…Several authors such as Cordão Sobrinho et al (2015) and Zonta et al (2015) have reported micronaire index values above 5.0 in experiments with irrigated cotton in the semi-arid region, considered coarse fiber, and above the tolerable value by the textile industry (Fonseca and Santana, 2002). According to the results founded in this study, this high value of micronaire index can be associated with the SS method to collect fiber samples, in which mainly first-rank bolls are collected, where fiber bring the highest values of micronaire (Belot and Dutra, 2015).…”

Section: Resultsmentioning

confidence: 99%

Influence of boll sampling method and water stress on fiber quality of irrigated cotton (Gossypium hirsutum L.)

Zonta¹,

BrandÃ£o²,

Rodrigues³

et al. 2017

Afr. J. Agric. Res.

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The quality of cotton fibers in Brazil has been studied. This was done by studying the fiber samples obtained from bolls removed from the middle third of the plants. These fiber samples are referred to as "standard sample". This way to collect fiber data requires lots of labor, and may disguise the results obtained in experimental appraisals, due to human errors in gathering boll. Besides, cotton yield and quality is influenced by water availability, especially during abiotic tests with water deficit, in which, fiber quality samples may be affected by boll position. Thus, the objective of this study was to evaluate the influence of sampling method on the technological characteristics of cotton fibers, in irrigated and water stress tests at different stages of the crop cycle. Two methods were made to collect cotton fiber. The first method was the standard sample and the second way was gathering sample of bolls in randomized position, through all experimental plot (called randomized sample). The results show that the analysis performed by standard sample tend to overestimate the values of the fiber quality parameters, differing from the results obtained with the randomized sample that is representative of all plot. It was observed that the variability of cotton fiber quality affected by water stress treatments were best represented using bolls obtained by randomized method. Consequently, in the case of experiments with water stress, the most representative method to collect cotton fiber, is through a sampling of all the plant, and not only of the middle third.

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Efeito Da Irrigação No Rendimento E Qualidade De Fibras Em Cultivares De Algodoeiro Herbáceo

Cited by 26 publications

References 10 publications

Estimates of Genetic Parameters for Selection of Colored Cotton Fiber1

Estimates of Genetic Parameters for Selection of Colored Cotton Fiber1

Cotton Response to Water Deficits at Different Growth Stages

Influence of boll sampling method and water stress on fiber quality of irrigated cotton (Gossypium hirsutum L.)

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