The Sakhipur Upazila occupies an area of 435 km² including a 191 km² forest area. The Upazila is bounded on the north by Ghatail Upazila on the east by Bhaluka Upazila of Mymensingh district and Sreepur Upazila of Gazipur district, on the south by Mirzapur Upazila and Kaliakair Upazila of Gazipur district, and on the west by Basil and Kalihati Upazilas. Sakhipur Upazila consists of 6 unions, 1 pouroshova, 59 mauza, and 122 villages. Sakhipur is situated 80 km north of Dhaka the capital city of Bangladesh. It is located between 24°11´and 24°26´ N latitudes; and between 90°04´ and 90°18´ E longitudes. Climate- The Sakhipur area enjoys a sub-tropical monsoon climate with three distinct seasons, viz., summer (March to mid-June), monsoon (mid-June to mid-October), and the winter (mid-October to February). Among the climatic factors, rainfall, humidity, sunshine penetration, evaporation and evapotranspiration, canopy structure, etc. affect the growth and development of vegetation, woodlots, and Shorea trees as well as the associated undergrowth species to varying extents. The climatic data has been collected from the National Water Resource Database of the Center for Environmental and Geographic Information Services and analyzed accordingly. The mean annual rainfall is 1937mm and the mean annual temperature is 25.86°C (ranges from 20.25°C to 31.48°C). This tropical climate condition is characterized by a distinct rainy season from April to October and a strong dry season from November to March. The relative humidity varies between 69% and 86%, the duration of sunshine ranges from 5-9 hours and the average wind speed is 87 km/hour. The average MSL elevation of the area is 19 m. Soil- Sakhipur area belongs to the bio-ecological zone of Madhupur Sal. The soils of this area have a moderate to strong acidic reaction. The topography of this area is characterized by plain land or low hills rising 3.0-4.5 m above the surrounding paddy fields, locally known as 'Chalas', which are intersected by numerous depressions or ‘Baids’. Three major soil types are observed in Sakhipur areas, viz., deep red-brown terrace soils; shallow red-brown terrace soil, and brown mottled terrace soils. About half of the Sal forest's land is covered by deep red-brown terrace soil. The soils are moderately to strongly acidic in reaction with pH 5.0- 5.5. Major physical problems of soils of this tract are low organic carbon content, low fertility, and low moisture-holding capacity. The partly weathered/unweathered Madhupur tract clay is very compact and greatly affects the root penetration of the crop. Selection of research plots- The strategies for selection of research plots were comprised of (i) data of Bangladesh Forest Department on the exotic tree plantation in Madhupur Sal tract, (ii) field reconnaissance survey, (iii) record of previous studies in Madhupur Sal tract, (iii) data on the availability of massive plantations of exotic species (A. auriculformis), (iv) consideration of the existence of homogeneous factors, etc. and (v) relevancy with the objectives of this study. Hence purposive random sampling framework was employed to make the final selection of 12 sample plots based on the diverse ecological habitats, topography, tree species composition, and vegetation cover of the forest areas of Sakhipur. These 12 research plots located in public and private land were composed of three plots of each A. auriculiformis, S. robusta, E. camaldulensis, and M. indica. The size of research plot 36 m x 36 m = 0.132 ha was considered suitable in connection to research objectives. The exotic species A. auriculiformis occupied the major percentage of plantation at Sakhipur Upazila of Tangail district, but the plantations of E. camadulensis and S. macrophylla represented a very less percentage of plantation in that area. Soil sample collection and analysis- Bangladesh has a subtropical monsoon climate characterized by wide seasonal variations in rainfall, moderately warm temperatures, and high humidity. Usually, there are three seasons were generally recognized: a hot, humid summer from March to June; a less hot, rainy monsoon season from June to October; and a cool, dry winter from October to March. These three seasons were considered for sampling and recording data from the selected sites. The representative data were collected over a period of two years ranging from April 2010 to November 2011. The soil samples of the selected sites were collected and recorded three times per year, i.e., 2 times in each of April, July, and November months covering summer, monsoon, and winter seasons respectively. Soil samples were collected from 12 research plots (with 3 replications for each plot) of exotic (Acacia spp. and Eucalyptus spp.) and indigenous plantations (S. robusta and M. indica) of the study area to know the chemical properties. Soil sampling and testing provide an estimate of the capacity of the soil to supply adequate nutrients to growing plants. The collected soil samples were analyzed to determine some major chemical properties of soils to assess the soil nutrient status which is very important to tree growth. The soil analysis was done to know the status of pH, OC, OM, N, P, and K in the soil samples. The laboratory analyses of all soil samples were conducted in SRDI Laboratory, Farmgate, Dhaka. Standard scientific methods were followed for soil chemical properties analysis. Data were statistically analyzed using SPSS software (version 16.0). One-way ANOVA (DMRT) was used to test for significant differences (P<0.05) for marginal means of variables. Besides, data were also analyzed through Microsoft Excel.