ABSTRACT

An experiment was conducted at Cotton Seed Multiplication, Training and Research Farm, Sreepur, Bangladesh during 2016-2018 to evaluate the response of cotton plant height to different plant spacing, concentration as well as time of application of mepiquat chloride (MC) as growth regulator. Plant spacing were  like 45 cm × 30 cm, 60 cm × 20 cm, 60 cm × 30 cm, 60 cm × 40 cm, 75 cm × 30 cm, 75 cm × 40 cm, 90 cm × 10 cm and 90 cm × 45 cm; MC was sprayed @ 1.0 ml L-1 water at 25, 50, 75, 100 and 125 days after emergence (DAE) in 2016 whereas  @ 1.0, 2.0, 3.0 and 4.0 ml  L-1  water at 25, 50 and 75 DAE for each conc. in 2017. During 2008 MC sprayed @ 2.0 and 4.0 ml L-1 water at 25 DAE, 2.0 and 4.0 ml L-1 water  at 50 DAE,  2.0 ml L-1 water  at 25 as well as 50 DAE in 2018 along with water sprayed  as control. The shortest internodes (3.00 cm) was obtained from 1ml MC L-1 water at 25 DAE with medium plant spacing 60 cm ×   30 cm and the longest (6.67) was from water treatment with 90 cm × 45 cm spacing. So, cotton cultivation in Sreepur, Gazipur areas may be accelerated with foliar application of mepiquat chloride @ 1 ml L-1 water at 25 DAE along with plant spacing of 60 cm x 30 cm for higher yield and quality.

Key words: MC, spacings, foliar application, internode length