Provenance Trial of Melaleuca cajuputi Powell at Khuan Khreng Peat Forest, Nakhon Si Thammarat Province, Thailand Provenance Trial of Melaleuca cajuputi Powell at Khuan Khreng Peat Forest, Nakhon Si Thammarat Province, Thailand
Atitaya Srimarksuk, Kobsak Wanthongchai and Somporn Maelim
The objectives of this study were to compare height, diameter at ground level, survival rate, and physiological development of Melaleuca cajuputi Powell grown from seeds collected from 10 different provenances in southern Thailand that planted at Chaipattana foundation area, Khuan Khreng Peat forest.
A Randomized Complete Block Design (RCBD) was applied with 3 replication (blocks), each containing the 10 provenances. Twenty-five seedling, with 1 m x 1 m spacing were planted per provenance within each block. The seedling growth rate, survival rate and physiological development were observed in each plot after 1 month, 6 months, and 12 months. This study suggested that there were a significant differences in the height growth among the provenances at ages 1 month, 6 months, and 12 months (p < 0.01), with the heights of 62.69 cm, 121.93 cm, and 181.15 cm, respectively. There was also a significant difference in the diameter at ground level among the provenances at ages 1 month, 6 months, and 12 months (p < 0.01), with the average diameter values of 0.33 cm, 1.52 cm, and 3.11 cm, respectively. However, the survival rates were not significantly different. Regarding the physiological development, it was found that leaf areas and chlorophyll concentrations were significantly different among provenances (p < 0.01). The provenances were scored and ranked for the most appropriate seed sources, based on the findings on growth rate, survival rate and physiological development. The top three suitable M. cajuputi seed sources were Nakhon Si Thammarat, Chumphon, and Satun.