Abstract:

Through the method of indoor culture experiment, the rule of Nitrogen mineralization on different fertility soils in tobacco-growing areas of Chongqing was studied. According to the results of this experiment, the soil nitrogen mineralization parameter was obtained, and the relationship between mineralization potential(N0),organic matter, total nitrogen, pH and available nitrogen was discussed.　The results showed that the first order dynamic model can excellent fit experimental data under 35℃.The correlation coefficients and the amount of soil mineralized nitrogen showed a high significance（r high fertile soil=0.976、r fertile soil=0.986、r low fertile soil=0.996），and the amount of soil mineralized nitrogen between different fertility showed the significant difference too.　The sequence of soil nitrogen mineralization potential(N0) was：Soil nitrogen mineralization potential（N0）comparison:　high fertile soil（25.0mg kg-1±0.60）>fertile soil（21.5mg kg-1±0.61）>low fertile soil（19.7mg kg-1±1.14）；The sequence of mineralization rate was：low fertile soil（0.1596mg kg-1 d-1±0.0104）>fertile soil（0.1492mg kg-1 d-1±0.0155）>high fertile soil（0.1029 mg kg-1 d-1±0.0071）.There were different degree of positive correlation between total N、the organic matter、pH and Nitrogen mineralization potential（N0）. So, we should manure depend on the situation of the soil and the climate in the respect of fertility management.