Effect of Organic Fertilizer Combined with Biochar on Growth and Development of Flue-cured Tobacco
[Objective]To explore the practical significance of organic fertilizer combined with biochar in the production of flue-cured tobacco in Dali,Yunnan Province,the study was carried out from four aspects:the transformation of soil nutrients,the growth and development of to-bacco plants,the carbon and nitrogen metabolism in tobacco plants and the yield and quality of tobacco leaves.[Method]The field experi-ment was conducted,and three treatments were set up:applying only organic fertilizer(Y),applying only biochar(S)and applying organic fertilizer with biochar(Y+S).The input amount of C,N,P and K elements in each treatment room was consistent.[Result]Y+S and Y treatments were more beneficial to the formation of plant height,stem circumference and leaf area than S treatments;the activities of nitrogen metabolism-related enzymes and carbon metabolism-related enzymes in the plant were the best in Y+S,and the biomass of the tobacco plant was the largest.Compared with Y and S treatments,the water soluble sugar and reducing sugar in the upper flue-cured tobacco leaves were in-creased by 8.30-8.95 and 4.90-6.09 percentage points,respectively,and the ratio of sugar to alkali and potassium to chlorine was 6.29-6.97 and 0.22-0.27,significantly reducing the nicotine content by 0.82%;Compared with Y treatment,Y+S treatment significantly reduced the nicotine content by 0.38 percentage points and increased the proportion of equal tobacco,with an increase of 0.09 and 0.24 respectively;the output of flue-cured tobacco increased by 186.15 and 510.9 kg/hm2 respectively,and the output value of flue-cured tobacco increased sig-nificantly by 20 391.45 and 27 688.8 yuan/hm2 respectively.[Conclusion]The treatment of organic fertilizer combined with biochar is high-er than other treatments in agronomic traits and related enzyme activities,organic matter content in soil,total nitrogen and other nutrients,sig-nificantly increasing the yield and output value.The application of organic fertilizer combined with biochar is beneficial to further improve the quality of tobacco leaves in Dali Bay Bridge tobacco planting area.
Organic fertilizerBiocharFlue-cured tobaccoGrowth and developmentTobacco quality
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