Assessment of oleoresin yield in Pinus roxburghii Sargent using tapping methods and chemical stimulants in Garhwal Himalayas
Loading...
Date
2020
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
College of Forestry, Ranichauri Campus, V.C.S.G. Uttarakhand University of Horticulture and Forestry
Abstract
ABSTRACT
Name: Vaishali Deopa Id. No.: U.U.H.F./18352
Year of Admission: 2018 Degree: M.Sc. Forestry (Forest Products and Utilization)
Main subject: M.Sc. Forestry Department: Forest Products and Utilization
Advisor: Dr. Amol Vasishth (Associate Professor / HOD Forest Products and Utilization) Institute: College of Forestry, Ranichauri, Tehri-Garhwal.
Topic: “Assessment of oleoresin yield in Pinus roxburghii Sargent using tapping methods and chemical stimulants in Garhwal Himalayas”
The field experiments were conducted at ‘A’ block of College of Forestry, Ranichauri in the year 2019 to estimate the oleoresin yield of Pinus roxburghii Sargent using two methods of tapping (borehole and rill), in factorial RBD with three replications. Each experiment had 90 treatment combinations consisting of three factorsviz., three diameter classes viz. 30-35 cm, 35-40 cm and 40-45 cm, five chemical stimulants concentration viz. C1 (no chemical stimulant), C2 (10%Ethephon + 20%H2SO4), C3 (15%Ethephon + 25%H2SO4),C4 (20%Ethephon + 30%H2SO4)C5 (25%Ethephon + 35%H2SO4) andobservations wererecorded from Aprilto September months. The correlation coefficient between morphological parameters and oleoresin yield and between environmental factors and oleoresin yield were also analyzed.
The highest oleoresin yield (553 g/tree/month) was obtained from the tree diameter class of D3 (40-45 cm) in the month of June with the use of chemical stimulant C4(20%Ethephon + 30%H2SO4) in borehole method and in tree diameter class of D3 (40-45 cm) in the month of June with the use of chemical stimulant C3(15%Ethephon + 25%H2SO4) in rill method (587 g/tree/month). The oleoresin yield under rill method was recorded significantly higher than borehole. The maximum resin yield of 1696 g/tree/season was recorded in rill method which was 19.9% higher than the borehole method.The interaction of tapping method, tree diameter class and chemical stimulant were found significant. The significantly higher oleoresin yield (2993 g/tree/season) was obtained in the rill method of tapping in tree diameter class of D3 (40-45 cm) along with chemical stimulants of C3 (15% ethephon + 25% H2SO) which was found at par with the oleoresin yield in borehole tapping method (2793 g/tree/season) in tree diameter class of D3 (40-45 cm) with chemical stimulants of C4 (20% ethephon + 30% H2SO4).The positive and highly significant correlation coefficient was found between tree height and oleoresin yield, diameter of trees and oleoresin yield,temperature and oleoresin yield and evaporation andoleoresin yield.
The rill method is known to provide higher yield of oleoresin than the borehole method but rill method causes more damage to the trees and induce more fire incidences. Therefore, adoption of borehole method is more ecofriendly. Therefore, borehole method with the application of chemical stimulant C4 (20% ethephon + 30% H2SO4) in the trees having 40-45 cm d.b.h. during the tapping season i.e. April to September can be adopted than the rill method of tapping.
Description
M.Sc. Forestry
Keywords
Citation
Thesis M.Sc.