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Genetic divergence analysis of Shisham (Dalbergia sissoo Roxb.) elite clones under agroforestry system

KrishiKosh

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Title Genetic divergence analysis of Shisham (Dalbergia sissoo Roxb.) elite clones under agroforestry system
 
Creator Rai, Tarun Kumar
 
Contributor Tiwari, Salil
 
Subject null
 
Description The present investigation was conducted at Agroforestry Research Centre, Haldi, GBPUA&T, Pantnagar, Distt. Udham Singh Nagar, Uttarakhand. The field experiment was conducted during month of July 2011 to June 2012. The experimental materials consisted of 41 diverse genotypes collected from different parts of India. One year old plants were planted in Randomized Block Design with four replications in 2008. Four trees in block were maintained at 4x4 spacing with objective to evaluate the performance of 41 elite clones of Shisham under agroforestry system in reference to genetic variability, heritability, genetic advance, character association and their partitioning into direct and indirect effects of
component characters on tree volume over bark, genetic divergence, biomass and carbon stock and wheat component traits under Shisham based agroforestry system for yield Wheat crop was sown on 10th Nov’2011 as an intercrop. It was found that significant genotypic differences, supported by wide range of variation of mean values for all the characters indicated substantial inherent differences for characters under study in the experimental material. High estimates of heritability coupled with high genetic advance were observed in girth at ground level, volume over bark, diameter at ground level, bole surface area, branch angle, diameter at breast height, girth at breast height, basal area, crown length, volume under bark and tree height. Growth character – tree height, diameter at breast height and girth at breast height were found significantly and positively correlated with tree volume over bark, suggested the importance of these traits in formulating the selection indices for volume. Path – analysis revealed that in all set of data, girth at ground level, diameter at breast height, tree height, clear bole length, basal area, bole surface area, branch angle and volume under bark had direct positive effects on tree volume over bark. Based on Mahalanobis D2 analysis different clusters were formed and clustering pattern indicated substantial genetic diversity in the experimental material. The 41 genotype were grouped in 7 clusters. Intra-cluster distance ranged from 0 to 11.91. It was maximum in cluster III (11.91). Though per cent contribution calculated by modified method revealed that in addition to girth at ground level, other characters like diameter at ground level, girth at breast height, diameter at breast height, tree height, clear bole length, crown length, number of primary branches, bole straightness and basal area contributed substantially towards genetic divergence. Genotypes PS-54, PS-50, 19, PS-90, PS-48, 11, PS-2, 1009, PS-6, 5, 57, PS-
38, PS-46, 1010, PS-76 and 12 were highly divergent and better performing. Among the different aboveground components bole biomass contributed maximum 48.6-55.7 per cent towards total above ground biomass followed by branch contributing 31.1- 34.9 per cent, leaf contributing 3.02-7.23 per cent and twig contributing 2.1-6.2 per cent. Among the different belowground components the stump root biomass contributed (70.47-90.03 per cent) maximum towards total belowground biomass followed by lateral contributing 11.56- 25.35 per cent, fine root contributing 1.06-4.18 per cent. The above ground and below ground biomass in Shisham was found to be maximum in genotype PS-90. The data of aboveground carbon sequestration were showed that the contribution were found maximum in bole>branch>leaf>twig. Among the different belowground components stump root carbon contributed (70.88- 91.22 per cent) maximum towards total aboveground carbon sequestration followed by lateral root (8.69- 25.09 per cent) and fine root (1.01-4.01 per cent). The above ground and below ground carbon
sequestration in Shisham was found to be maximum in genotype PS-90. The more the biomass production, the more will be the carbon sequestration. The wheat yield was significantly reduced by shading.
 
Date 2018-10-17T10:05:14Z
2018-10-17T10:05:14Z
2012-08
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/5810081704
 
Language en
 
Format application/pdf
 
Publisher G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)