Studies on the Effect of Paclobutrazol as Foliar Spray on Growth Parameters of Tuberose (Polianthes tuberosa L.) var. Prajwal

A field experiment was carried out in Horticulture Research Farm, Bidhan Chandra Krishi Vishwavidyalaya, Mohanpur, to study the effect of paclobutrazol as foliar spray at different dates, on growth, flowering and bulb yield of tuberose (Polianthes tuberosa L.) var. Prajwal. The experiment was carried out during the year 2016-2018 (March - March) to find out the suitable dose of paclobutrazol and suitable time of its spraying to get maximum flower production. The experiment was laid out in augmented factorial randomized block design with three replications. The first factor contains three different doses of Paclobutrazol application P1 (100 ppm), P2 (200 ppm), P3 (300 ppm) as foliar spray and the second factor is with three different times of Paclobutrazol application i.e., S1 (45 DAP), S2 (65 DAP), S3 (85 DAP). A control plot is made without any application of paclobutrazol to observe the difference in the treatment effect. The results reveal that, the plant height, number of leaves per clump, leaf area and leaf area index were found maximum in the control treatment and those parameters were found at par with P1 (Paclobutrazol 100 ppm). Regarding the spraying time of the paclobutrazol plant height, number of leaves, leaf area and leaf area index was found maximum with S3 (85 DAP).The number of days taken for first spike emergence was early in P1 (Paclobutrazol 100 ppm) and in S1 (45 DAP). Interaction effect of paclobutrazol and its spraying times was found non-significant for almost all the parameters except for plant height and leaf area.