Effect of Plant Growth Regulators on Dendrobium orchids cv. Sonia 17 for Vegetative Growth Under Shade Net Conditions in High Altitude Tribal Zone of Andhra Pradesh, India

The present investigation entitled “Effect of plant growth regulators on Dendrobium orchid cv. Sonia 17 for vegetative growth and flower yield under shade net conditions in high altitude tribal zone of Andhra Pradesh” was carried out at Horticulture Research station, Chintapalli, Visakhapatnam district of Andhra Pradesh during two consecutive years of 2016-17 and 2017-18. The experiment was laid out in a completely randomized design with 13 treatments and each treatment replicated thrice. The data recorded on various vegetative parameters viz., Plant height, Number of leaves per plant, Number of shoots per plant, Shoot girth, Leaf length, Leaf width and were statistically analyzed. Significant differences were observed among different plant growth regulators on various vegetative parameters in Dendrobium orchids cv. Sonia 17. Among all the treatments GA3 @ 50 ppm showed significantly best results with respect to Plant height, Number of leaves per plant, Number of shoots per plant, Leaf length and Leaf breadth and Shoot girth was recorded more with application of Benzyl adenine 200 ppm.