Vol. 12, Issue 2 (2023)

Author(s):
Neetha P and Subodh Dhonde

Abstract:
The present study was undertaken to investigate the interrelationship among growth traits in Candidate Plus Trees (CPTs) of Neem (Azadirachta indica) using correlation and path coefficient analysis. A total of 30 CPTs were selected from naturally occurring populations across three districts of South Eastern Rajasthan-Kota, Baran, and Jhalawar-representing diverse agro-climatic conditions. Key growth traits, including height, girth at breast height (GBH), and volume, were measured and analyzed. Descriptive statistics revealed substantial variability among the CPTs, indicating potential for selection and genetic improvement. Pearson’s correlation analysis showed a strong and highly significant positive correlation between girth and volume (r = 0.891**), while height exhibited weak and non-significant correlations with both girth and volume. Path coefficient analysis revealed that girth had a high direct positive effect on volume (0.882), making it the most influential trait for biomass accumulation. In contrast, height had a lower direct effect (0.144) and a minimal indirect effect via girth. These results underscore the importance of girth as a primary selection criterion in Neem breeding programs aimed at improving productivity and wood volume. The findings provide a quantitative foundation for future selection strategies in Neem tree improvement initiatives.