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International Journal of Current Microbiology and Applied Sciences (IJCMAS)
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National Academy of Agricultural Sciences (NAAS)
NAAS Score: *5.38 (2019)
[Effective from January 1, 2019]
For more details click here

ICV 2017: 100.00
Index Copernicus ICI Journals Master List 2017 - IJCMAS--ICV 2017: 100.00
For more details click here

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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
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Index Copernicus ICV 2017: 100.00
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Int.J.Curr.Microbiol.App.Sci.2019.8(5): 539-554
DOI: https://doi.org/10.20546/ijcmas.2019.805.063


Abscission of Fruiting Structures in Bt and non-Bt Cotton in Relation to Abiotic Factors and Agronomic Intervention under Rainfed Condition
M.R. Thakur1* and V.M. Bhale2
1Soil and Water Management, NARP Phase II, Cotton Research Sub Station, Navsari Agricultural University, Achhalia, Gujarat, India-393120
2Department of Agronomy, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola, Maharashtra, India-444104
*Corresponding author
Abstract:

A two year field experiment was conducted to elucidate relation of abscission of fruiting structures in cotton (Gossypium hirsutum) with abiotic factors and effect of agronomic intervention viz., spacing (90 × 60 cm and 90 × 45 cm) and NPK levels (50:25:25, 62.5:31.25:31.25 and 75:37.5:37.5 kg NPK ha-1) on abscission of fruiting structures, leaf reddening and chlorophyll content in Bt and non-Bt cotton of same genotype, following split plot design with 4 replicates at Akola. Abscission of fruiting structures increased linearly with increase in morning relative humidity and number of rainy days in a week. However, relations with minimum temperature, evening relative humidity and rainfall were non linear and varied according to their range. Minimum temperature range of 20-22 °C, evening relative humidity beyond 52% and rainfall more than 60 mm in a week were most critical for abscission. Bt cotton lost more fruiting structures through abscission, recorded maximum leaf reddening, but gave higher seed cotton yield. Whereas, non-Bt recorded maximum chlorophyll content. Spacing of 90 x 45 cm compensated abscission losses and recorded higher seed cotton yield than 90 x 60 cm. Application of 75:37.5:37.5 kg NPK ha-1 recorded higher seed cotton yield by minimizing abscission and leaf reddening with improvement in chlorophyll content but was at par with 62.5:31.25:31.25 kg NPK ha-1. Thus, it can be conclude that to harness higher seed cotton yield under rainfed condition Bt cotton should be sown at 90 x 45 cm spacing and fertilized with 62.5:31.25:31.25 kg NPK ha-1.


Keywords: Abscission of fruiting structures, Abiotic factors, Bt and non-Bt cotton, NPK levels, Spacing
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How to cite this article:

Thakur, M.R. and Bhale, V.M. 2019. Abscission of Fruiting Structures in Bt and non-Bt Cotton in Relation to Abiotic Factors and Agronomic Intervention under Rainfed Condition.Int.J.Curr.Microbiol.App.Sci. 8(5): 539-554. doi: https://doi.org/10.20546/ijcmas.2019.805.063