Effects of Cake Fertilizer and Microbial Agents on the Yield and Quality of Flue-Cured Tobacco and Soil Microbial Characteristics
In order to improve the soil in tobacco-growing areas and increase the yield and quality of flue-cured tobacco,seven treatments[no cake fertilizer and microbial agent(CK),peanut cake(P),sesame cake(S),compound cake(C),peanut cake+microbial agent(PM),sesame cake+microbial agent(SM),compound cake+microbial agent(CM)]were set up to explore the effects of combined application of cake fertilizer and microbial agent on photosynthetic parameters,antioxidant enzyme activities,physical properties,chemical components of flue-cured tobacco leaves and soil microbial characteristics.The results showed that compared with CK treatment,the net photosynthetic rate(Pn),superoxide dismutase(SOD),peroxidase(POD),ascorbate peroxidase(APX),catalase(CAT)activities and total sugar,total protein,starch,reducing sugar,total nitrogen,potassium content of tobacco leaves were increased by single cake fertilizer application.The yield of flue-cured tobacco was increased by 3.6%—14.1%,and the number of soil bacteria was significantly increased by 9.6%—25.9%.When the same cake fertilizer was applied,the application of microbial agents significantly increased the Pn of tobacco leaves,and the activities of SOD,POD and CAT,the output value of flue-cured tobacco significantly increased by 7.8%—11.7%,and the contents of microbial biomass carbon and microbial biomass nitrogen in soil significantly increased by 11.6%—18.4%and 37.4%—48.6%.Therefore,single application of cake fertilizer or combined application of microbial agents could increase the number of soil microorganisms,enhance plant stress resistance,improve the net photosynthetic rate of flue-cured tobacco,increase the yield of tobacco leaves and optimize the chemical composition of flue-cured tobacco.Among them,the combined application of compound cake and microbial agents is better.
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