Vol. 12, Issue 4 (2023)

Author(s):
Ram Singh, Jitendra Singh, Rohini Kumar Painkra and Dharmendra Khokhar

Abstract:
A field trail was conducted to study the effect of different levels of growth promoters and retardants on growth and flower yield of different cultivars of Tuberose. Two PGR’s namely Gibberellins (GA₃) and Paclobutrazol (PBZ) were taken as growth promoter and growth retardant, respectively. Two cultivars namely Prajwal and Bidhan Ujjwal were taken to evaluate their suitability in Chhattisgarh. In this contest, an experiment was conducted to investigate the effect of different levels of growth promoter and retardant on growth and flower yield of different cultivars of Tuberose (Polianthes tuberosa L.) was carried out in Horticulture Research Farm at the Department of Floriculture and Landscape Architecture, IGKV, Raipur, Chhattisgarh, India, 2017-18 and 2018-19. The experiment was laid out in Factorial Randomized Block Design with three replication comprising treatment combination of two PGRs (GA₃ and Paclobutrazol) and two tuberose cultivars (Prajwal and Bidhan Ujjwal). The result indicated that the vegetative growth and flowering yield were significantly influenced by different plant growth regulators and cultivars. The maximum plant height was recorded with cv. Prajwal (V₁) as compared to cv. Bidhan Ujjwal (V₂). While, number of spike m^-1 and weight of 10 florets (g) was recorded with cv. Prajwal (V₁). Among the growth regulators treatments GA₃ 150 ppm (30 and 50 DAP) recorded maximum plant height. However, maximum spike yield ha^-1and bulb yield ha^-1 was noticed with treatment GA₃ 150 ppm (30 and 50 DAP). The pooled analysis of two year data also indicated that the general cost of tuberose cultivation was (219433.50 ha^-1) per hectear including labour cost, cost of various inputs and over head costs. The highest gross returns (952615.66 Rs. ha^-1), net returns (732937.16 Rs. ha^-1) and highest benefit: cost ratio (3.33) was found in the treatment GA₃ 150 ppm (30 & 50 DAP) + PBZ 10 ppm (70 DAP). whereas the lowest (653088.00 Rs. ha^-1) was observed in control.