Proceedings of the International Academy of Ecology and Environmental Sciences, 2023, 13(2): 66-80 IAEES www.iaees.org Article Effect of morphological parameters with relation to the Oleoresin production: A case study from Narendranagar Forest Division, Uttarakhand, India Dharm Singh Meena 1 , Akash 2 , K.R. Sharma 3 , B.S. Bhandari 4 1 Bhagirathi Circle, MuniKiReti, Tehri Garhwal, Uttarakhand, India 2 Department of Botany, Dhanauri, P.G. College, Haridwar, Uttarakhand, India 3 Yashwant Singh Parmar University of Horticulture and Forestry, H.P, India 4 HNB Garhwal University, Srinagar, Uttarakhand, India E-mail: dfonnagar@gmail.com Received 17 January 2023; Accepted 25 February 2023; Published online 5 March 2023; Published 1 June 2023 Abstract Pinus roxburghii is one of the most important tree species used for resin tapping and for commercial purpose in Uttarkhand. The present study aim to investigate the relationship of Oleoresin production with morphological parameters. We have divided the three Oleoresin yield classes, i.e., high resin yielders (HRY’s), medium resin yielders (MRY’s) and low resin yielders (LRY’s). The production potential of Oleoresin showed tends to increase with the various morphological parameters like diameter at breast height, number of bore holes. At the same time, bark thickness, tree needle length along with the thickness and colour of needle also has been tested which showed the positive correlation with the Oleoresin production. Further we have recorded significant differences in the diameter ranges 40-50 (12.99 ltr. = HRY’S, 28.30 ltr. in MRY’S and 7.27 ltr. in LRY’S) and 50-60 (10.82 ltr. = HRY’S, 3.2 ltr. in MRY’S and 6.05 ltr. in LRY’S) with maximum yield of Oleoresin in Chir pine. ANOVA showed that Oleoresin production vary significantly in all the categories of Oleoresin production (P<0.05) with respective to the different diameter ranges along with the bark thickness, needle length and colour. Keywords Oleoresin; morphological parameters; Narendranagar Forest Division; diameter. 1 Introduction 1 Introduction Pinus roxburghii is commercially tapped for Oleoresin in Western Himalaya. It is generally found as a sub- tropical species in the Himalayan sub-tropical pine forests (Champian and Seth, 1968). Pinus roxburghii is most commonly known as Chir pine and mainly used for resin tapping in Uttarakhand, Himachal Pradesh, Proceedings of the International Academy of Ecology and Environmental Sciences ISSN 22208860 URL: http://www.iaees.org/publications/journals/piaees/onlineversion.asp RSS: http://www.iaees.org/publications/journals/piaees/rss.xml Email: piaees@iaees.org EditorinChief: WenJun Zhang Publisher: International Academy of Ecology and Environmental Sciences