Effects of Tobacco Stem Biochar Combined with Potassium Fertilizer on Growth,Yield and Quality of Flue-cured Tobacco
[Objective]The effects of nutritional balancing supply of potassium and magnesium on the growth,yield and quality of flue-cured tobacco were studied to provide basis for the production of high-quality tobacco leaves.[Method]Taking Yunyan 87 as the test material,five treatments,including CK:conventional fertilization(600 kg/hm2 compound fertilizer),T1:conventional fertilization+tobacco stem biochar(600 kg/hm2),T2:conventional fertilization+potassium sulfate compound fertilizer(600 kg/hm2),T3:conventional fertilization+tobacco stem biochar+potassium sulfate compound fertilizer,T4:conventional fertilization+slow-release potassium fertilizer(1 200 kg/hm2),T5:conventional fertilization+tobacco stem biochar+slow-release potassium fertilizer,were set through randomized block experiment to study their effects on the physiochemical properties of soil,the chemical components and economic benefits of cured tobacco leaves.[Result]The soil pH treated with tobacco stem biochar(T1,T3 and T5)decreased by 4.00%,7.18% and 11.06% compared with CK,respectively.The contents of soil organic matter,total nitrogen,total phosphorus,total potassium,hydrolyzable nitrogen,available phosphorus and available potassium all increased.Compared to CK,the plant height,stem girth,the number of effective leaves,maximum leaf length of tobacco plant under different treatments all increased,and the agronomic traits of T5 were the best.Compared with CK and increasing the application of tobacco stem biochar lonely,the potassium ions content at middle part of cured tobacco leaves treated with the combined application of tobacco stem biochar and potassium fertilizer(T3 and T5)increased,and the total sugar,reducing sugar,total nitrogen,nitrogen-nicotine ratio and potassium-chlorine ratio increased,the chemical components were more harmonious,while the chlorine ion content reduced.The potassium ion content at upper part of tobacco leaves and total nitrogen increased,while the content of total sugar decreased.The ratio of upper-class tobacco and medium-upper class tobacco treated with tobacco stem biochar showed an increasing trend.The yield respectively increased by 1.88%,8.58% and 10.34% compared with CK,and the output value increased by 0.67%,13.43% and 15.95%,respectively,among which the economic benefit of T5 treatment was the best.[Conclusion]Tobacco stem biochar can improve soil quality,promote the growth,economic benefit and quality of tobacco plant.Compared with potassium sulfate compound fertilizer,the slow-release potassium fertilizer can slowly release potassium,which not only meet the growth demand of flue-cured tobacco,but also are more beneficial to the uptake of tobacco plant in later periods and improve the quality of tobacco leaves.Combining application of tobacco stem biochar and potassium fertilizer has more benefits,and has the best effect as combined application with slow-release potassium fertilizer,which can significantly improve the growth,yield and quality of flue-cured tobacco.
tobacco stem biocharpotassium fertilizersoilphysiochemical propertiesgrowth and developmenteconomic characteristicsquality of tobacco leaf
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