Abstract:In order to explore the function of applied bioorganic fertilizer to root-zone soil under tobacco-rice rotation, a field experiment was conducted to study the effects of applied bioorganic fertilizer to root-zone soil on agronomic characters, photosynthetic characteristic, tobacco quality and economic characters in Guiyang County of Hunan Province. The results showed that compared with control (row fertilization), applied bioorganic fertilizer to root-zone soil could accelerate tobacco plant growth, improve chlorophyll content and tobacco leaf photosynthetic capacity, it increased the area of the largest leaf by 24.58% at rosette stage; increased the stem girth, the area of the largest leaf, SPAD value, net photosynthetic rate, stomatal conductance, intercellular CO2 concentration and transpiration rate by 4.72%, 19.29%, 14.78%, 7.30%, 22.64%, 5.63% and 32.14%, respectively, at topping stage; increased the SPAD value, net photosynthetic rate, stomatal conductance, intercellular CO2 concentration and transpiration rate by 15.64%, 23.82%, 30.00%, 8.31% and 15.26%, respectively, at first picking stage. Compared with control (row fertilization), applied bioorganic fertilizer to root-zone soil could promote tobacco quality and increase tobacco yield and output value, it increased the ratio of top rank, yield, output value, physical character index, chemical component index, smoking quality score, nitrogen partial factor productivity and nitrogen partial production efficiency by 5.96%, 12.39%, 17.51%, 5.76%, 18.46%, 5.43%, 12.38% and 17.51%, respectively. Applied bio-organic fertilizer part replacement of special base fertilizer for tobacco is feasible because it could improve tobacco smoking quality, ratio of top rank and nitrogen partial production efficiency.