Efficacy of Defoliants on Yield and Fibre Quality of American Cotton in Semi-Arid Conditions

Raghavendra, T.; Reddy, Y. R.

doi:10.18805/ijare.a-5288

Cited by 7 publications

(4 citation statements)

References 5 publications

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“…At 15 days after defoliants spray Thidiazuron + Diuron (0.03%) recorded higher defoliation (98.6, 98.1 and 97%) in all three time of application which is on par with Sodium chlorate (0.9%). Similar results were observed in [14] and [15] found the highest defoliation rate in Drop Thidiazuron + diuron treated plants. It might be due to the change of the ethylene to auxin ratio, leaf abscission prematurely occurred after application of defoliants like Thidiazuron [16].…”

Section: Effect Of Defoliants On Defoliation Percentagesupporting

confidence: 91%

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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Section: Effect Of Defoliants On Defoliation Percentagesupporting

confidence: 91%

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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“…Defoliation initiated from 4 days after defoliant application, Thidiazuron + Diuron (0.03%) treatment registered significantly higher defoliation percent (66.82, 33.02 and 61.90%) at three different stages. Raghavendra et al, (2020) reported that higher leaf defoliation was observed in Dropp ultra @ 200ml/ha spraying. But interestingly, defoliants spray at 120 and 134 DAS recorded the highest defoliation rate.…”

Section: Effect Of Defoliants On Percent Defoliationmentioning

confidence: 98%

“…However, in India, the usage of defoliants could not be exploited much primarily due to their limited availability. However, recent works (Mrunalini et al, 2019 andRaghavendra et al, 2020) Impact of Chemical Defoliants on Chlorophyll Fluorescence, Biochemical Parameters, Yield and Fiber Quality... reported the effect of few defoliants on upland cotton in India. With these background, an experiment was conducted to study the impact of defoliants on improving defoliation capacity in cotton.…”

Section: Introductionmentioning

confidence: 99%

Impact of Chemical Defoliants on Chlorophyll Fluorescence, Biochemical Parameters, Yield and Fiber Quality of High Density Cotton

Chandrasekaran¹,

Ravichandran²,

Senthil³

et al. 2021

IJARe

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Background: The Cotton growing farmers in India are facing major problem at the time of harvest due to labor shortages, asynchronized boll opening, leaf trash in the cotton, which is reducing the boll picking efficiency and fiber quality. Presently, the Indian cotton industry is moving towards mechanical harvesting by cotton harvester. Defoliation or leaf abscission is induced in cotton as a natural physiological process which usually is inadequate for a complete mechanical harvest of cotton. Defoliation before harvest is often induced by managing the plants so that senescence, abscission (separation) layer development and leaf drop are encouraged. Chemical defoliants induce leaf abscission, hasten mature boll dehiscence and inhibit re growth. Selection of appropriate defoliants is one of the critical decisions in cotton production. Their use can result in increased manual as well as machine harvest efficiency, reducing boll rot and the trash in seed cotton. The physiological basis of defoliation in cotton is essential to understand the role of appropriate defoliant with time of application. Hence, the objective of the study was to evaluate the defoliation efficiency, boll opening percentage and to know the physiological basis of defoliation in response to different defoliants and time of application in high density Cotton cultivation which eases the mechanical harvesting.Methods: In this field investigation during 2018 - 2019 at Department of Crop Physiology, Tamil Nadu Agricultural University, Coimbatore was carried with seven different defoliants and three different time of defoliants application were fixed based on crop maturity and duration of the crop. In this study, high density cotton variety CO 17 was used as experimental material. A series of lab and field analysis were determined on defoliation process, physiological attributes, boll opening percentage and seed yield and quality. The collected data were subjected to statistical analysis.Result: Our investigation exploring the effect of different defoliants on physiological, biochemical, yield and quality parameters of high density Cotton. Among the different defoliants and time of applications, two defoliants and two times of applications works better in terms of better defoliation, boll opening rate, physiology, yield and quality. The physiological and biochemical effects of defoliants on defoliation process were discussed. The present work will be useful for mechanized picking with these effective defoliants without loss of yield and quality loss in cotton.

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“…A two-year study conducted on black cotton soil at Nandyal, Andhra Pradesh with American cotton under semi-arid conditions revealed that significantly higher defoliation percentage was observed with defoliant spray at 140 DAS (92.2 %) compared to defoliant application at 120 DAS (87.2%) (Raghavendra and Rama Reddy, 2020). Gormus et al, (2017) Mrunalini et al, (2019) from Bapatla, Andhra Pradesh reported that net returns (Rs.…”

Section: Percent Defoliation In Cottonmentioning

confidence: 99%

An overview of Defoliants Use in Cotton

Sravanthi¹,

Rekha²,

Venkateswarlu³

et al. 2020

Int.J.Curr.Microbiol.App.Sci

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Efficacy of Defoliants on Yield and Fibre Quality of American Cotton in Semi-Arid Conditions

Cited by 7 publications

References 5 publications

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

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

Impact of Chemical Defoliants on Chlorophyll Fluorescence, Biochemical Parameters, Yield and Fiber Quality of High Density Cotton

An overview of Defoliants Use in Cotton

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