Bangladesh lies between 20°34′ and 26°38′ north latitude and 88°01′ and 92°41′ east Longitude with an area of 147570 square kilometers. The climate of Bangladesh is characterised by high temperature ranges and high humidity, heavy rainfall and marked seasonal variation. Daily temperature ranges from 10°C to 12°C in winter months (December-January) and in the summer months from April to September it varies between 28°C to 40°C.The soil of Bangladesh may be divided into three main categories, namely hill soil (Chittagong and Sylhet region), terrace soil (Barind and Madhupur tracts) and alluvial and flood plain soil in other parts. Bangladesh contains greater bio-diversity than many other countries taken together.