Selection of clones of Eucalyptus camaldulensis (Dehnh.) based on stability for tree volume
A study on the stability of 21 clones of Eucalyptus camaldulensis was carried out in four trials established in the southern part of India viz., Ariyalur and Marakkanam in Tamil Nadu and Karaikal in Puducherry and Tripathi in Andhra Pradesh during 2010. Trials were laid out in Randomised Block Design (RBD) with four replications each with 16 trees. Single tree volume was estimated after measuring tree height, diameter and form factor after seven years of planting. The volume calculated for individual clones present in all four trials were subjected to AMMI stability analysis using CROPSTAT. The average single tree volume of the clones studied varied from 0.035 to 0.11 m3 across locations. The Additive Main Effects and Multiplicative Interaction (AMMI) analysis revealed that the genotypic, environmental and GEI effects were 9.6, 68.6 and 21.8 per cent of the total sum of squares, respectively. Planting site plays a major role when compared to genotype and its interaction with the site. IPCA1 captured 75.43 per cent (p=0.001) followed by IPCA2 that captured 19.29 per cent (p=0.007) of the interaction effects. The AMMI Stability Values (ASV) showed a variation from 0.04 to 1.17. The study identified two clones out of twenty-two to be highly stable across the four locations studied for single tree volume.
Key words: Eucalyptus camaldulensis, Genotype by Environment Interaction, Single tree volume, AMMI analysis
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