Effects of Organic Fertilizer on Soil Enzyme Activity and Rapidly Available Nitrogen in Tobacco Plant Rhizosphere of Purple Soil

[Objective] The research aimed to provide the theoretical basis for the regular application of organic fertilizer on flue-cured tobacco. [Method]The field experiment was conducted to study the effects of different organic fertilizer applied in purple soil on soil enzyme activity and rapidly available nitrogen in tobacco plant rhizoshere,Nanxiong. [Result]600 kg / hm2 organic fertilizer could improve the activity of soil invertase,catalase,protease,alkaline phosphatase and urease in tobacco plant rhizosphere at varying degree in field period,in which the effects of bio-organic fertilizer were the most significant. Ammonium and nitrate content of tobacco rhizosphere soil changed with different types of organic fertilizer in filed period,but its relationship with the activity of soil invertase,catalase,protease,alkaline phosphatase and urease in tobacco rhizosphere was extremely significant. Soil available nitrogen content in tobacco rhizosphere dealt with bio-organic fertilizer accorded with the law of production of high quality tobacco leaf nitrogen uptake,and significantly increased the tobacco leaf maturity resistance in flied by significantly increasing its root activity. [Conclusion]The application of organic fertilizer had the positive practical significance on the delay of tobacco senescence and the guarantee of mature resistance in the field.