| Summary: | <p>The research on site quality and bonita classification was conducted to know the interactions<br />
between site quality and plant growth of Gmelina arborea Roxb. in Typic Hapludults soil type. Based<br />
on the inventory data of G. arborea until 5 years old, the growth rate w~ divided to 3 categories i.e. good,<br />
medium and bad growth performance. At each growth performance, soil samples were taken for soil<br />
analysis. The plant growth was affected by site quality. The good growth performance had better site<br />
qualities, soil chemical (C, N, P, K, Ca, Mg etc) and physical characteristics (field slope, BY etc). Soil<br />
nutrient availability and field slope are important for plant growth performance and total production of<br />
G. arborea plantation forest</p>
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