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Central Agricultural University, Pasighat

The Central Agricultural University has been established by an act of Parliament, the Central Agricultural University Act, 1992 (No.40 of 1992). The Act came into effect on 26th January, 1993 with the issue of notification by the Department of Agricultural Research and Education (DARE), Govt. of India. The University became functional with the joining of first Vice-Chancellor on 13th September, 1993. The jurisdiction of the University extends to six North-Eastern Hill States viz., Arunachal Pradesh, Manipur, Meghalaya, Mizoram, Sikkim and Tripura, with headquarters at Imphal in Manipur. College of Horticulture & Forestry, a constituent College of the Central Agricultural University, Imphal, Manipur, was established on 7th March 2001 at Pasighat, Arunachal Pradesh on the bank of beautiful river Siang.

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20221
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Subject: Forest Biology and Tree Improvement ×
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    ThesisItemOpen Access
    Study of variation in fibre morphology and wood in Gmelinaarborea Roxb.”
    (College of Horticulture and Forestry, Central Agricultural University, Pasighat, 2022-08-11) Naorem, Sunayna Devi; Naorem, Sunayna Devi; Naorem, Sunayna Devi; Dobhal, Shivani; Dobhal, Shivani; Dobhal, Shivani; Tayeng, Tisu; Tayeng, Tisu; Tayeng, Tisu
    Themajorityofthetreesexaminedwereinthe11-15mheightclass(57.5%)and,51-60and61-70cmDBHclass(30%each).TheCBHrangedfrom4.03-12.75m,no.ofbranches(2-5)andbarkthickness(0.76-1.4)cm. The anatomical parameters studied were fibre length, fibre diameter, lumen diameter, wallthickness and specific gravity; and their derived properties, viz. runkel ratio, flexibility coefficient,slendernessratio,luce’sshapefactor,wallproportionandrigiditycoefficient.Thepooledmeanvaluesrecorded for all the eleven anatomical parameters were fibre length (1160.82 µm), fibre diameter (21.20µm), lumen diameter (16.16 µm), wall thickness (5.04 µm) and specific gravity (0.46); and their derivedproperties, viz. runkel ratio (0.63), flexibility coefficient (76.19%), slenderness ratio (54.75), luce’s shapefactor(0.26),wallproportion(47.68) andrigidity coefficient(0.48). Analysis of variance revealed the core sections for both the locations showed substantialvariations for all the fibre properties except for the wall thickness. However, the genotypes showedvariationsforallthefibrepropertiessignificantly.Clusteranalysiswasbasedonthepooledmeandataof growth as well as fibre morphological properties and classified the genotypes into seven clusterseach.Theresultsoftheprincipalcomponentanalysisexhibitedthatthemajorcontributortodivergencewas specific gravity in both the locations i.e., Manipur (25.37%) and Pasighat (20.68%). The correlationanalysis indicated that both the Manipur and Pasighat Gmelina trees exhibited a positive and strongassociationinthefibrediameterandlumendiameteranalysis.Thefibrederivativecorrelationanalysisalso revealed a positive and strong correlation between runkel ratio, luce’s shape factor, wall proportionandrigidity coefficientin both thelocations. The pooled result of the study showed that the tree GA38/P/CHF outperformed in four traitsi.e.,runkelratio(0.54),flexibilitycoefficient(78.89),wallproportionratio(42.42)andrigiditycoefficient(0.43).