A study was investigated to assess the preliminary growth performance of sal (Shorea robusta) in
mixture with its four associates e.g. chakua koroi (Albizia chinensis), motor koroi (Albizia
lucidor), shimul (Bombax ceiba), udal (Sterculia villosa) and other three site suitable species e.g.
neem (Azadirachta indica), teligaijan (Dipterocarpus turbinatus), dhakijam (Syzygium firmum) in
degraded sal forest in the northern region of Bangladesh. Two experiments were established in
June 2017 and June 2018 at Charkai Silviculture Research Station, Birampur, Dinajpur. Sal and
motor koroi, chakua koroi, neem and teli gaijan were planted in four treatments with four
replications in 2017. In 2018 sal and shimul, udal, dhakijam were planted in three treatments with
four replications. Randomized complete block design was followed. Plantation was established in
June-July. Each replication plot was 14 m x 14 m in size with 49 seedlings for mono-plantation
and 49 seedlings for mixed plantation in 483 ratio at 2 m x 2 m spacing. Single line alternate was
applied in mixed plot for raising plantation. In the experiment, preliminary data on the survival
rate, height (cm) and diameter (mm) of two-years-old and one-year-old seedlings of sal and
associate species from single and mixed plantation data were collected in July, 2019. Analysis of
data showed significant differences among sal and selected treatment species at 5% significant
level other than neem. These findings revealed that, as site suitable species, gaijan and dhakijam
showed the significant growth performance in mixture with sal as well as in mono-plantation.
Moreover, chakua koroi, motor koroi and udal can also be considered as good associates of this
suggested sal mixed plantation.
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