Kumar, PrashantRani, Rupa2017-06-202017-06-202013http://krishikosh.egranth.ac.in/handle/1/5810022129RESPONSE OF PGR AND MICRONUTRIENTS FOR QUALITY FLOWER PRODUCTION IN TUBEROSE (Polianthes tuberosa) UNDER PROTECTED AND OPEN CONDITIONSTuberose (Polianthes tuberosa) is one of the most important bulbous flowering ornamentals and has a unique place in the cut flower trade. It belongs to the family Agavaceae and is native to Mexico. Now, floriculture is emerging as a potential business due to divergence of farmers towards high value floral crops and utilization of flowers in social and industrial level. With the commercialization of floriculture, demand for tuberose in the national and international trade is increasing due to its importance as cut flower, loose flower,production of essential oil and for use in perfumary industry. Poor spike quality, low productivity and less vase life in the existing practices are the major constraints of tuberose cultivation under Jharkhand conditions. Keeping in view the above facts, research on quality flower production of tuberose under agro-climatic situation of Jharkhand was designed with two experiments. In the first set of experiment the response of tuberose to the foliar application of plant growth regulators and micronutrients such as GA3, MH, boron and zinc in single as well as in combinations were investigated. In the second experiment vase life of tuberose in different holding solution of various chemicals were studied. The first experiment was laid out in randomized block design with three replications and the crop was raised under two growing environments i.e. open and polyhouse conditions. In the first experiment tuberose grown under polyhouse exhibited superior results in respect of vegetative, flowering and bulb parameters. Maximum spike length of 87.38cm was recorded in open and 117.59cm in polyhouse conditions with foliar spray of GA3 (100ppm) +B (100ppm) +Zn (10ppm) and it was followed by GA3 (100ppm) +B (100ppm) spray with spike length of 86.83cm and 112.40cm in open and polyhouse respectively. Number of spikes per plant(1.33 in open and 2.7 in polyhouse) , number of florets per spike(40.57 and 59.10 in open and polyhouse), maximum floret weight per spike (58.64g) in polyhouse and vase life (10.52days) in tap water were also exhibited by application of GA3(100ppm)+B(100ppm)+Zn(10ppm). Foliar application of MH (500ppm) +B (100ppm) +Zn (10ppm) resulted in maximum diameter (4.18 cm in open and 5.14 cm in polyhouse) of florets. Significantly higher number of bulbs (8.08 in open and 8.31 in polyhouse) and weight of bulbs per plant (126.82g in open and 176.65g in polyhouse) were shown by GA3 (100ppm) +B (100ppm) +Zn (10ppm) Spray while, maximum diameter of bulb (2.13cm in open and 2.70cm in polyhouse) was shown by foliar spray of MH (500ppm) +B (100ppm) +Zn (10ppm). On the other hand, the second experiment was laid out in completely randomized design with four replications with an objective to study the vase life of tuberose in different solutions at room temperature viz., sucrose (4%), AgNo3 (100ppm), Carbendazim (0.2%), Bleaching powder(50ppm), Sucrose (4%)+ AgNo3 (100ppm), Sucrose (4%)+ Carbendazim (0.2%), Sucrose (4%)+ Bleaching powder (50ppm), Control (water). Use of Sucrose (4%) +AgNo3 (100ppm) as vase solution resulted in maximum uptake of water (57.31g/3spikes) followed by Sucrose (4%) + Carbendazim (0.2%). Sucrose (4%) + Bleaching powder (50ppm) solution showed maximum loss of water (52.03 gm/ 3 spikes). Maximum vase life (15.57days) with highest floret opening (84.48 %) was obtained in the vase solution of Sucrose (4%) +AgNo3 (100ppm).en-USnullThesis