Effect of Microalgae Application on Growth and Yield Quality of Flue-cured Tobacco
In order to clarify the impact of microalgae inoculants at different concentrations on the growth,and quality of flue-cured tobacco,and to provide a theoretical basis for the application of microalgae in tobacco production,three different concentrations of mi-croalgae treatments were established:T1(14 mL·L-1),T2(28 mL·L-1),and T3(56 mL·L-1),along with a blank control(water).The study evaluated various indicators such as the agronomic traits of tobacco plants,the physical shape of cured tobacco leaves,chemical components,and economic traits.Additionally,the incidence rate of bacterial wilt was assessed and investigated.The results showed that:(1)the application of microalgae significantly increased the height and stem circumference of tobacco plants during the rosette stage.Compared to the control(CK),the three treatments involving microalgae application led to an increase in plant height and stem circumference ranging from 28.37％to 42.40％and 4.9％to 12.5％,respectively.Additionally,it significantly boosted the effective number of leaves in flue-cured tobacco.Considering the comprehensive agronomic traits,the T2 treatment demonstrated the best re-sults.Compared to the CK,the incidence of tobacco bacterial wilt in T1,T2,and T3 treatments decreased by 45.5％,21.2％,and 72.7％,respectively.(2)The microalgae bacteria agent effectively improved the physical characteristics of roasted tobacco leaves,in-creased leaf weight,reduced stem content and water content,and significantly increased yield.The T3 treatment achieved the highest yield,which was 2 052.9 kg·hm-2,followed by the T2 treatment.The application of microalgae significantly improved the proportion of fine tobacco and the combined proportion of medium and fine tobacco,with the T2 treatment yielding the highest output value of 41 282.95 yuan·hm-2.(3)The application of microalgae exerted diverse impacts on the chemical composition of cured tobacco leaves.In comparison with CK,the contents of N,K,and total sugar in the middle leaves treated with microalgae decreased significantly by 0.6％-1.4％,3.2％-5.4％,and 4.6％-6％respectively.The nicotine contents presented the sequence of T2＞T3＞CK＞T1.In the lower leaves,there were marked differences in the contents of nicotine,reducing sugar,and total sugar among the treatments,with the T2 treatment demonstrating the highest levels at 2.66％,19.19％,and 23.33％,respectively.In conclusion,the application of microalgae significantly enhances the number of effective leaves and the height of tobacco plants,markedly raises the proportion of high-grade to-bacco and medium-high-grade tobacco,and boosts the output value of flue-cured tobacco.The application of microalgae contributes to enhancing the quality of tobacco leaves after roasting,makes the chemical composition more harmonious,and significantly lowers the incidence of bacterial wilt.Taking all indicators into consideration,the T2 treatment(28 mL·L-1)has the most optimal effect.
flue-cured tobaccomicroalgae bactericideyield and qualityeconomic properties
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