International Journal of Plant & Soil Science

The experiment has been conducted to determine the activity of plant  growth regulators and pinching on the  growth and flowering yield of African marigold (Tagetes erecta L.) in the Department of Horticulture, Sam Higginbottom University of Agriculture Technology and Sciences, Prayagraj, (UP) during  Rabi season 2021-2022, nine treatments were included in this trial viz..., T₀ Control, T₁ GA₃ 100 PPM + Pinching, T₂ GA₃ 200 PPM + Pinching, T₃ Triacontanol 20 ppm + Pinching, T₄ Triacontanol 30 ppm + Pinching, T₅ Lihocin 2000 ppm + Pinching, T₆ Lihocin 4000 ppm + Pinching, T₇ NAA 10 ppm + Pinching and T₈ NAA 20 ppm + Pinching, were tested in three replications. The experiment of this design was randomized block design. The results has revealed that GA₃ treatments and pinching had significant response on the plant height, number of branches per plant, number of leaves per plant, plant spread per plant, days from bud initiation to harvest, days required for flower appearance from transplanting, number of flowers per plant, flower diameter, fresh and dry flower weight, flower yield per plant, flower yield per plot, and flower yield per hectare. The maximum plant height  (76.17cm), number of branches per plant (53.21), plant spread (90.22cm), number of leaves per plant (409.07), flower yield per plant (402.13g/plant), flower yield per plot (1.57kg), and flower yield per hectare (15.67) were recorded in the treatment T₂ GA₃ 200 PPM + Pinching. This treatment showed the best results in vegetative growth and yield production.