INFLUENCE OF PRE - PLANTING TREATMENTS OF PLANT GROWTH REGULATORS AND CHEMICALS ON GROWTH, FLOWERING AND SHELF LIFE OF TUBEROSE (Polianthes tuberosa L.)
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Date
2009
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AAU, Anand
Abstract
The present investigation entitled "Influence of pre-planting treatments of plant growth regulators and chemicals on growth, flowering and shelf life of tuberose (Polianthes tuberosa L.)" was carried out at the College Nursery, Department of Horticulture, B, A. College of Agriculture, Anand Agricultural University, Anand during the year 2007-08. The experiment was framed in a randomized block design with three replications. Total 14 treatments comprised of two PGR's i. e. GA3 (50, 100 and 150 ppm) and ethrel (200, 300 and 400 ppm), two chemicals i.e. thiourea (500, 1000 and 1500 ppm) and potassium nitrate (100, 200 and 300 ppm) and compared with two controls i.e. water dipping for 12 hours and without water dipping. Observations were recorded on growth, flowering and yield characters from five randomly selected plants at different plant growth stages (60, 90, 120 and 150 DAP). The results revealed that the PGRs and chemicals significantly influenced on different traits. Among the treatments, GA3 at 100 ppm significantly reduced the number of days (29.67) required for sprouting of bulbs as well as increased the plant height (34.70 cm, 41.83 cm, 51.33 cm and 67.33 cm, respectively at 60, 90, 120 and 150 days after planting) in tuberose. The plant spread in North-South was also significantly higher (29.60 cm) after 150 DAP in 100 ppm GA3. While the highest plant spread in East-West directions (31.87 cm) was recorded in GA3 at 150 ppm but it was at par with 100 ppm GA3 concentration. In general gibberellic acid @ 100 ppm was superior in most of the vegetative and flowering parameters under the trial. The flowering parameters viz. first flower initiation (107.54 days), fifty percent flowering (155.29 days), number of spikes per clump (28.00), number of florets per spike (45.19), spike length (91.73 cm) and flower weight (3.80 g) were significantly higher in the treatment of gibberellic acid (GA3) @ 100 ppm as compared to rest of the treatments and controls. While maximum flower diameter was observed in the treatment of 500 ppm thiourea at bud and fully open stages. In case of yield characters, GAs at 100 and 150 ppm gave the maximum number of spikes per plant (5.39). Similarly, the number of bulbils (28.12) per plant was maximum in the treatment of 100 ppm GA3. However, treatment of 500 ppm Thiourea recorded the highest bulb diameter (17.00 cm). The shelf life of flowers was maximum (11.33 days) in the treatment of 100ppmGAa. From the above investigation it can be concluded that, when the bulbs of tuberose treated with 100 ppm GA3 solution for 12 hours before planting, had better vegetative growth with more number of clumps, higher number of flowers and thereby maximum production of bulblets. The treatment was also found most profitable with highest net returns (Rs. 1, 99,910 / ha.) and GBR (1:2.18).
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HORTICULTURE, AGRICULTURE, A STUDY