GROWTH, FLOWERING AND YIELD OF BULB OF TUBEROSE AS INFLUENCED BY POTASSIUM AND GIBBERELLIC ACID

Abstract

An experiment was conducted at Horticulture Farm of Sher-e-Bangla Agricultural University (SAU), Sher-e-Bangla Nagar, Dhaka-1207 during the period from August, 2017 to October, 2018 to find out the effect of potassium and Gibberellic Acid (GA ) on growth, flowering and yield of bulb of tuberose. The experiment consisted of two factors namely. Factor A: levels of Potassium (K 0 = Control; 0 kg K = 130 kg K 2 O/ha, K 2 = 150 kg K 2 O/ha, K 3 = 170 kg K 2 2 O/ha) and Factor B: Concentration of Gibberellic Acid (G 0 = Control, G 1 = 120 ppm, G = 150 ppm) with three replications. The experiment was laid out in Randomized Complete Block Design (RCBD). At 75 days the maximum plant height, number of leaves per plant, number of spike per plant and side shoot per plant 63.50 cm, 10.22, 16.09 and 1.90 was found from K 2 (150 kg K 2 O/ha) respectively and also 62.55 cm, 9.16, 12.67 and 1.45 was found from G (120 ppm) respectively that was significantly influenced due to the effect of potassium and Gibberellic Acid (GA ). The highest number of floret per spike 43.00 and 38.93 were found from K 2 3 (120 ppm) respectively. The highest yield of bulb (18.86 t/ha) and bulblets (20.70 t/ha) was found from K (150 kg K 2 O/ha) and G 1 2 O /ha, K (150 kg K O/ha) and the lowest from K 0 (control, 0 kg K O/ha). On the other hand the highest yield of bulb (17.21 t/ha) and bulblets (17.86 t/ha) was obtained from G 2 (120 ppm) and the lowest from G 0 (control). In respect of combined effect, K 2 G 1 1 produced maximum yield of bulb (19.36 t/ha) and bulblets (21.99 t/ha) and the lowest from K 0 G . So the present investigation exhibits that, combined effect of 150 kg K 2 0 2 2 O/ha with 120 ppm GA is suitable for growth, flowering and yield of bulb of tuberose.