Optimization of Spacing and Fertilizer Requirement for Pre-release Cotton Varieties Under Irrigated Condition

Abstract

Field experiments were carried out at Cotton Research Station, Srivilliputturfrom August to January 2017-18 and 2018 -19 to optimize fertilizerrequirement of prerelease varieties of cotton with two levels of spacingunder irrigated conditions. The experiments were conducted in a splitsplit-plot design with three replications. The treatments consisted of twopre-release cotton varieties (GSHV 177 and CCH 14-1 during 2017-18 andBGDS 1033 and CCH 15-1 during 2018 -19 ) in main plots and two levels ofplant geometry (75 x 30 cm and 75 x 45 cm) in subplots and three doses offertilizers (75 % RDF - 60:30:30 Kg NPK/ha, 100 % RDF - 80:40:40 Kg NPK/ ha and 125% RDF- 100:50:50 Kg NPK/ha) were accommodated in subsubplots.The results revealed that the genotypes GSHV 177 and CCH 15-1performed better by producing taller plants, a higher number of sympodia,bolls per plant, and a number of bolls/m2 with higher seed cotton yield andeconomic benefits. Adoption of normally recommended spacing of 75 x 30cm recorded significantly more bolls production and higher seed cotton yieldthan the wider spacing of 75 x 45 cm during both the years of study. Theeffect of both 125 and 100 per cent RDF on a number of bolls / m2 was onpar. Application of 125 per cent RDF registered comparable seed cottonyield during 2017-18 and significantly higher than 100 per cent RDF during2018-19. Higher total income, net income and benefit-cost ratio were alsoobserved with under 75 x 30 cm spacing and 125 per cent RDF.

DOI

https://doi.org/10.29321/MAJ.2020.000338

Pages

21 - 24

Creative Commons

Copyright

© The Author(s), 2026. Published by Madras Agricultural Students' Union in Madras Agricultural Journal (MAJ). This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited by the user.

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