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为了改善烟叶质量,探讨最适宜的生物炭施用量,系统阐明生物炭对烤烟生长及烟叶质量的影响。以云烟87为试验材料,通过田间试验研究了3种不同生物炭施用量(3 000 kg/hm~2、3 750 kg/hm~2、4 500kg/hm~2)对烤烟生长及烟叶质量的影响,并利用R语言构建了偏最小二乘路径模型。结果表明:施用生物炭能显著降低烤烟黑胫病发病率及病害指数,较低水平的生物炭施用水平能促进烤烟生育前期的生长及根系发育,协调烟叶化学成分;生物炭施用量过高时对烟叶质量产生负面影响。偏最小二乘路径模型明确了施用生物炭后烤烟生长及烟叶质量各指标之间的关系,系统地阐明了生物炭促进烤烟生长及烟叶质量的作用机制。综合来看,最适宜的生物炭施用量为3 750 kg/hm~2。
In order to improve the quality of tobacco leaf and explore the most suitable biochar application rate, the effects of biochar on the growth and quality of flue-cured tobacco were systematically clarified. Taking Yunyan 87 as experimental material, the effects of three different biochar application rates (3 000 kg / hm ~ 2,350 kg / hm ~ 2,4 500 kg / hm ~ 2) on the growth and quality of flue-cured tobacco Influence, and use the R language to build a partial least-squares path model. The results showed that the application of biochar could significantly reduce the incidence and disease index of blackleg of flue-cured tobacco. The lower biochar application level could promote the growth and root development of flue-cured tobacco at early growth stage and harmonize the chemical composition of tobacco leaves. When the biochar application rate was too high Negative impact on tobacco quality. Partial Least Squares Path Model clarifies the relationship between the growth of flue-cured tobacco and the quality of tobacco leaves after the application of biochar, and systematically expounds the mechanism of biochar’s promotion of tobacco growth and leaf quality. Taken together, the most suitable biochar application rate is 3 750 kg / hm ~ 2.