Vol. 8, Issue 10, Part C (2024)

The present investigation entitled “Studies on comparative bioefficacy and phytotoxicity of plant growth regulators on chilli (Capsicum annuum L.)” was conducted in summer season of 2023 at All India Co-ordinated Research Project on Vegetable Crops, Department of Horticulture, Mahatma Phule Krishi Vidyapeeth, Rahuri, with an objective to study effects of different plant growth regulators on growth, flowering, fruiting, yield characters and phytotoxicity symptoms in chilli. The experiment was conducted with ten treatments viz., T₁- NAA @ 10 ppm, T₂- NAA @ 15 ppm T_3­- NAA @ 20 ppm, T₄- Triacontanol @ 1 ppm, T₅- Triacontanol @ 2.5 ppm, T₆- Triacontanol @ 5 ppm, T₇- GA @ 10 ppm, T₈- GA @ 15 ppm, T₉- GA @ 20 ppm, T₁₀- Control (water spray) laid out in Randomized Block Design with three replications. The plant growth regulators were sprayed twice i.e. first spray at initiation of flowering and second at days to 50 % flowering. Among all the treatments of plant growth regulators the foliar spray of GA @ 10 ppm recorded better results in flowering, fruiting and yield characters followed by Triacontanol @ 1 ppm and NAA @ 20 ppm in chilli. The phytotoxicity symptoms were not observed during the experimental duration as influenced by plant growth regulators.