Chizhou Distriict is an important black tea area in Auhwei Province.The tea plantation covess on area of over 25,000 mu,and the tea gardens are distributed mainly over limestone hilly land and mounols,Under the conditions of the moist subtropical monsoon climate, the forming process of the soil in the limestone-distribution area is a process of strong eluviation and weathering,and such a soil forming process is closely related to the geomorphologic conditionns,the limestone formation and its lithlogic character.Therefore, though the outcrop of limestone can be seen around the tea gardens,the soil is a zonal soil with acid or slightly acid reactions and is snitable for the growth of tea trees.On the contrary,though the soil layer is thick and having no outcrops of limestones in some depressions or vaalley bottoms,the soil is alkaline and is harmful to the tea trees.