The effect of defoliant application on yield and yield components of some cotton (Gossypium hirsutum L.) cultivars at timely and late sowing

Haliloğlu, Hasan; Cevheri, Cevher İlhan; Beyyavaş, Vedat

doi:10.31015/jaefs.2020.2.5

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…Boll weight is the most important factor that directly contributes to cotton yield (Table 3). Similar to our findings, Qamar et al, (2016) and Haliloğlu et al (2020) indicated that the delay in sowing time causes a decrease in boll weight. Killi et al (2005) reported that boll seed weight decreased by 14% in late sowing.…”

Section: Boll Weight (G)supporting

confidence: 93%

“…The fiber yield per plant obtained in normal sowing (128.44 and 126.51 g) was higher in both years of the experiment than the late sowing (73.33 and 83.35 g) (Table 4). The findings on higher fiber yield per plant in normal sowing compared to late sowing are in accordance with the findings of Qamar et al (2016), Hussain et al (2020), Haliloğlu et al (2020), Dhir et al (2021) and Tariq et al (2021). The fiber yield per plant (109.68 and 114.68 g) of the Candia variety was higher in 2017 and 2018 compared to the Lima variety (92.09 and 97.17 g) (Table 5).…”

Section: Fiber Yield Per Plant (G)supporting

confidence: 91%

“…The number of bolls (20.95 and 20.61 per/plant) obtained from cultivars Candia was higher than that of Lima (18.17 and 18.69 per/plant). Similarly, Hussain et al (2020) and Haliloğlu et al (2020) stated that the number of bolls in normal sowing time was higher than the number of bolls in late sowing time. Cotton has an indeterminate growth habit, which provides a higher number of bolls per plant if the plants remain longer period in the field or planted earlier (Qamar et al 2016).…”

Section: Resultsmentioning

confidence: 96%

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Effect of Sowing Time in Cotton (Gossypium Hirsutum L.) on Boll Distribution, Cellulose Ratio and Fiber Quality

2023

THE JAPS

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The growth, flowering, square, and boll formation of the cotton plant are significantly affected by sowing time and fruiting distributions. This study was carried out in order to determine the effect of sowing time, varieties and boll distribution on fiber yield and fiber quality of cotton, under the GAP region ecological conditions of Türkiye during 2017 and 2018 cotton growing seasons. In this study, Candia and Lima cotton varieties were used as plant material. Cotton seeds were sown on 5 May (normal sowing) and 10 June (late sowing) using a pneumatic seeder in both years. In the study, the number of bolls (per plant -1 ), yield per plant (g plant -1 ), boll weight (g), ginning outturn (%), holocellulose, cellulose, scan viscosity, and polymerization degree were studied. According to the research, the number of bolls, boll weight, and fiber yield were higher in normal planting than in late planting. The low positional sympodial branch (1-5 fruit branches) boll position was better in the number of bolls, and the middle positional sympodial branch (6-10 fruit branches) was better in boll weight compared to other positions. The fiber yield obtained in a low positional sympodial branch (1-5 fruit branches) and middle positional sympodial branch (6-10 fruit branches) positions was higher than the upper positional sympodial branch position (11 and higher fruit branches). The effects of sowing times and cultivars on cellulose and holocellulose rations were statistically insignificant. The cellulose ratio (94.40) obtained in the upper positional sympodial branch position (11 and higher fruit branches) in the first year was higher than the other sympodial positions, while the effect of the boll position was statistically insignificant in the second year of the experiment. In conclusion, the planting time had a significant effect on boll positions and fiber quality of cotton. Late sowing had negative impact on boll maturation, cellulose synthesis, yield and fiber quality. Hence, the delay in cotton planting caused a decrease in yield; so, cotton should be sown as early as possible in the region.

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Section: Boll Weight (G)supporting

confidence: 93%

Section: Fiber Yield Per Plant (G)supporting

confidence: 91%

Section: Resultsmentioning

confidence: 96%

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Effect of Sowing Time in Cotton (Gossypium Hirsutum L.) on Boll Distribution, Cellulose Ratio and Fiber Quality

2023

THE JAPS

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“…As senescence is progressing, a swelling of thylakoid membranes, a slight increase in the number of plastoglobuli, and a decrease of pigment contents is observed; eventually leading to the degradation of the thylakoid membranes, the significant increase in the number and size of plastoglobuli, and to the further decrease of chlorophyll contents [22]. [23] and [24] indicated that the seed cotton weight decreased by 14% in late sowing results were coinciding with our study. Ethephon (0.5%) and Thidiazuron + Diuron (0.03%) showed higher yield than other treatments.…”

Section: Effect Of Defoliants On Physiological Parameterssupporting

confidence: 90%

Effect of Different Defoliants and Time of Application on Defoliation Percentage and Boll Opening Percentage in High Density Cotton (Gossypium hirsutum L.)

Chandrasekaran

Ravichandran

Senthil

et al. 2020

IJPSS

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Aims: To evaluate the time and type of chemical defoliants to improve the mechanical and manual picking of high density cotton CO 17 in terms of higher defoliation and increase boll opening percentage. Study Design: The study was performed in split plot design with seven treatments and four replications. Place and Duration of Study: This field study was carried out in Department of Crop Physiology TNAU, Coimbatore during September 2019 to January 2020. Methodology: Three time of defoliants application (120 Days After Sowing (DAS), 127 DAS and 134 DAS) for main plot and seven treatment levels of Control, 2, 4 D (0.5%), Ethephon (0.5%), Ethephon (0.5%) + TIBA (450 ppm), Sodium chlorate (0.9%), 6-BAP (0.1%), Thidiazuron + Diuron (0.03%) for sub plot. Results: Defoliation percentage was significantly enhanced from 4 days after defoliants spray. Boll opening percentage also increased with defoliants spray when compared to control plants. Although a significant effect was observed on SPAD value, NDVI value and seed cotton yield. Conclusion: From this study, application of Thidiazuron + Diuron (0.03%) and Sodium chlorate (0.9%) had significantly positive effect in per cent defoliation and boll opening percentage and it will work better in young cotton plants compare to mature one.

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Evaluating the effects of defoliant spraying time on fibre yield and quality of different cotton cultivars

Wang

Deng²,

Kong³

et al. 2023

J. Agric. Sci.

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Chemical defoliants are widely used in cotton (Gossypium L.) to accelerate leaf abscission and boll maturation, as well as, to facilitate mechanical harvesting. The current study was conducted to determine the interactive effect of cotton cultivars and spraying time of defoliant on defoliation, boll opening, fibre yield and quality. An experiment was performed with four cultivars and three defoliant spraying time during 2019 and 2020 in split plot design with three replications. At harvest, the defoliation and boll opening rate of all treatments after spraying defoliant was 94.6 and 85.4%, while the blank control (water) was 73.9 and 79.1%, respectively. After spraying defoliant, the effects of defoliation rate, boll opening rate, fibre yield and quality were different among cultivars, indicating that different cultivars had different responses to defoliant. Among them, L7619 was the most sensitive to defoliant, with the average defoliation rate of 95.6% and a seed cotton yield reduction of 882.9 kg/ha. Among the different time of applications, late spraying (17 September, B3) of defoliant recorded the highest defoliation rate (97.3%), boll opening rate (89.8%), seed cotton yield (3991 kg/ha) and steadily increased the fibre strength by 0.59 cN/tex compared with the control. Late spraying of defoliant had little or even no adverse effect on the remaining fibre quality traits (length, uniformity, micronaire and elongation). In general, these results suggested that the appropriate time for spraying defoliant can be determined based on the sensitivity of the cotton cultivar, the weather conditions at the field and the harvest time.

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The effect of defoliant application on yield and yield components of some cotton (Gossypium hirsutum L.) cultivars at timely and late sowing

Cited by 6 publications

References 15 publications

Effect of Sowing Time in Cotton (Gossypium Hirsutum L.) on Boll Distribution, Cellulose Ratio and Fiber Quality

Effect of Sowing Time in Cotton (Gossypium Hirsutum L.) on Boll Distribution, Cellulose Ratio and Fiber Quality

Effect of Different Defoliants and Time of Application on Defoliation Percentage and Boll Opening Percentage in High Density Cotton (Gossypium hirsutum L.)

Evaluating the effects of defoliant spraying time on fibre yield and quality of different cotton cultivars

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