RESUMEN
A field experiment was conducted at Siddapur research farm, Regional Agricultural Research Station, Warangal, Telangana, India during kharif 2022 to investigate the effect of plant geometry and cultivars on growth and yield of cotton under high plant density system. The results revealed that plant height (102.7 cm) and drymatter production (6499 kg ha-1) were significantly higher at ultra narrow spacing of 90 x 15 cm (74,074 plants ha-1) than medium and wider spacings of 90 x 30 and 90 x 60 cm, respectively but, was on par with narrow spacing of 90 x 20 cm (55,555 plants ha-1). Though sympodial branches plant-1 (16.4) and number of bolls plant-1 (24.0) were significantly greater with wider spacing (90 x 60 cm: 18,518 plants ha-1), adoption of high plant density method of 90 x 15 cm spacing (74,074 plants ha-1) (2707 kg ha-1) and 90 x 20 cm (55,555 plants ha-1) (2498 kg ha-1) resulted in significantly higher seed cotton yield. The yield from 90x15 cm was 26.2% and 11.7% higher than that of 90 x 30 cm (2391 kg ha-1) and 90 x 60 cm (1998 kg ha-1), respectively. In case of cultivars, though growth and yield attributes were not significantly influenced, but, the boll weight (5.2) and seed cotton yield (2845 kg ha-1) were significantly higher with NCS 2778 over other cultivars viz., Bt Suraj (2151 kg ha-1), WGCV-79 (2310 kg ha-1) and ADB-39 (2288 kg ha-1).
RESUMEN
A field trial to determine the effect of different dosages, Scheduling time of plant growth regulators and defoliators on growth and yield of cotton under high density planting system was conducted at Regional Agricultural Research Station, Warangal during kharif-2022. The experiment consisted of eleven treatments laid out in Randomized Block Design with three replications. The treatment details were T1: Application of Mepiquat chloride (M.C) 25 g a.i ha-1 @ 40 & 55 DAE + Ethereal 2000 ppm @ 40 % boll burst, T2: M.C 25 g a.i ha-1 @ 40 & 55 DAE + Ethereal 2000 ppm @ 60 % boll burst, T3: M.C 20, 30 g a.i ha-1 @ 40, 55 DAE respectively + Ethereal 2000 ppm @ 40% boll burst T4: M.C 20, 30 g a.i ha-1 @ 40, 55 DAE respectively + Ethereal 2000 ppm @ 60% boll burst T5: M.C 20 g a.i ha-1 @ 40,55 & 75 DAE+ Ethereal 2000ppm @ 40 % boll burst, T6: M.C 20 g a.i ha-1 @ 40, 55 & 70 DAE + Ethereal 2000 ppm @ 60 % boll burst, T7: M.C 25 g a.i ha-1 @ 40, 55 & 70 DAE + Ethereal 2000 ppm @ 40 % boll burst, T8: M.C 25 g a.i ha-1 @ 40, 55 & 75 DAE+ Ethereal 2000ppm @ 60% boll burst, T9: M.C 20, 25, 30 g a.i ha-1 @ 40, 55 and 70 DAE respectively + Ethereal 2000 ppm @ 40 % boll burst, T10: M.C 20, 25, 30 g a.i ha-1 @ 40, 55 and 70 DAE respectively + Ethereal 2000 ppm @ 60 % boll burst and T11: Control .(Water spray at 40, 55 and 70 DAE). Results revealed that foliar application of M.C @ 20 g a.i ha-1 @ 40, 55 & 70 DAE in conjunction with Ethereal 2000 ppm @ 60% boll burst recorded higher seed cotton yield. Plant growth, dry matter accumulation and stalk yield were recorded highest in control plot and lowest with spraying of M.C 20, 25 and 30 g a.i ha-1 @ 40, 55 and 70 DAE respectively + Ethereal 2000 ppm @ 40 % boll burst. Among similar doses of Mepiquat chloride, all the agronomic traits of cotton crop are positively influenced with application of 2000 ppm Ethereal @ 60% boll burst. The spraying of M.C @ 20 g a.i ha-1 at 40, 55 and 70 DAE + Ethereal 2000 ppm @ 60% boll burst would be economically ideal to the farming community.