Vol. 10, Issue 12 (2021)

Author(s):
Dr. Brijal R Patel, Dr. PP Chaudhary, MM Chaudhary and Dr. Thumu V Reddy

Abstract:
A field experiment was conducted during the two consecutive kharif seasons of the year 2018 and 2019 at Agronomy Instructional Farm, Chimanbhai Patel College of Agriculture, Sardarkrushinagar Dantiwada Agricultural University, Sardarkrushinagar, to study the “Enhancing productivity of Bt cotton grown under high density planting system using mepiquat chloride.” Significantly higher number of bolls/plant, average boll weight and seed cotton yield/plant were recorded with plant density of 37,037 plants/ha (60 cm × 45 cm). Seed cotton and stalk yield (kg/ha) as well as harvest index was found significantly higher with narrow plant density of 74,074 plants/ha (45 cm × 30 cm). The magnitude of increase in seed cotton and stalk yield (kg/ha) due to plant density of 74,074 plants/ha (45 cm × 30 cm) over plant density of 37,037 plants/ha (60 cm × 45 cm) was 68.53 and 35.17 per cent, respectively on pooled analysis basis. Among plant density treatments, narrow plant density of 74,074 plants/ha (45 cm × 30 cm spacing) ranked at top in terms of net realization and B: C ratio. Three spray of mepiquat chloride @ 0.4 ml/lit at 45, 60 and 75 days after sowing recorded significantly highest values of yield attributes, seed cotton yield and harvest index. Three spray of mepiquat chloride @ 0.4 ml/lit at 45, 60 and 75 days after sowing produced 28.83 per cent higher seed cotton yield than control treatment in pooled mean. The highest net realization and B: C ratio were obtained with treatment of three spray of mepiquat chloride @ 0.4 ml/lit at 45, 60 and 75 days after sowing.