Vol. 11, Issue 6 (2022)

Author(s):
R Ariraman, ChelviRamessh, A Gurusamy, P Saravana Pandian and T Sivakumar

Abstract:
Field investigation was conducted in summer 2021 in order to study the effect of moisture regimes and split application of nitrogen and potassium on cotton quality parameters. Split plot design with three replications was chosen for experimental study. The main plot consists of four treatments with moisture regimes based on IW/CPE ratio (0.8 and 0.4) with RCH 659 hybrid (non Bt) cotton and RCH 659 BG II (Bt). Sub plot comprises of N and K application in split doses viz., N₁ - 50% N and K as basal + 25% N and K at 45 DAS + 25% N and K at 60 DAS, N₂ - 25% N and K as basal+ 25% N and K at 45 DAS + 25% N and K at 60 DAS + 25% N and K at 75 DAS, N₃ - 50% N and K as basal + 12.5% N and K at 45 DAS + 12.5% N and K at 60 DAS+ 12.5% N and K at 75DAS + 12.5% N and K at 90 DAS, N₄ - 0% N and 50% K in basal + 25% N and 50% K at 45 DAS + 25% N at 60 DAS + 25% N at 75DAS + 25% N at 90 DAS with 16 treatment combinations in total. The results of the study revealed that RCH 659 BG II when irrigated at 0.8 IW/CPE ratio registered higher fibre quality (maturity ratio, bundle strength, uniformity index, elongation percentage micronaire value and span length) when compared to other moisture levels and non – Bt genotypes. There was no significant effect as regards split application of N and K. Interaction was also not significant.