Study area: Study area comprised of Anandanagar, Sepahijala
and Boxonagar, 30 km apart from each other in West of Tripura
state (latitude 22º56’–24º32’N and longitude 91º10’–92º21’E), in
North-East India. The subtropical climate of the area experiences a
mean annual temperature of 25ºC and annual rainfall of 2000 mm.
Soils of study area, in general, are acidic.