Studies on effect of plant growth regulators on plant growth and flower yield of crossandra (Crossandra infundibuliformis L.) var. Arka ambara

Abstract

The field experiment was conducted to determine “Effect of Plant Growth Regulators on Growth and Flower Yield of Crossandra (Crossandra infundibuliformis L.) cv. Arka Ambara” under Prayagraj agro-climatic conditions in the Department of Horticulture, SHUATS, Prayagraj, (U.P) during the Kharif season 2019-20. The experiment was laid out in Randomized Block Design with 13 treatments replicated thrice. The treatments were comprised of three concentrations of Gibberellic acid (50,100,150 ppm), NAA (50,100,150 ppm), Cycocel (500,750, 1000 ppm), Maleic Hydrazide (100,200,300 ppm) and control (water spray). The plant growth regulators were sprayed four times viz., 30, 60, 90 and 120 days after transplanting.The result revealed that T7( GA3@150ppm) was recorded maximum plant height (71.10) and minimum in CCC @1000ppm T10(48.61).Significantly maximum leaf area (2987.67 cm2), number of branches(16.23),duration of flowering (128 days),number of flowers per spike (51.45), flower yield per plant (82.60 g), flower yield per hectare (4.23 t/ha), shelf life (3.64 days ) were also observed in plants sprayed with the Gibberellic acid @150ppm similarly minimum was observed with T0 control and days taken to flower spike initiation T6 (35.23days) observed at GA3 @100 ppm significantly early to harvest and maximum flower weight (4.24 g) /100 flower was observed. The results shows that significant difference among the different plant growth regulators with respect to growth parameters, which are responsible for flower yield.