Compared with general tea plantation (clean tillage tea plantation), the effects of straw mulching and white clover intercropping on soil environment, the yield and quality of tea in young tea plantation in subtropical hilly region were studied through four years large-field experiments. Results show that both of the two biological measures decrease the soil density and improve soil physical properties and soil fertility. The soil water content is increased in key layers (0~20 cm depth) during key period (April to June), and the period of high temperature and drought is postponed and shortened...