关键词: 烤烟, 生物炭, 偏最小二乘路径模型, 烟叶质量

Abstract: In order to improve the quality of tobacco leaf and probe the optimum application amounts of biochar, this paper systematically expounded the effects of biochar on the growth of flue-cured tobacco and quality of tobacco leaf. This paper took Yunyan 87 as experimental material and studied the effects of 3 application amounts of biochar (3 000 kg/hm2, 3 750 kg/hm2, 4 500 kg/hm2) on the growth of flue-cured tobacco and quality of tobacco leaf by field test. The partial least squares path modeling was constructed by R programming language. The results showed that biochar application could significantly decrease the disease morbidity and disease-infected indexes of black shank of flue-cured tobacco. The lower level application of biochar could promote the growth of flue-cured tobacco in the earlier growing stage, development of root system, and coordinate the chemical compositions in tobacco leaf. The overdose of biochar had negative effect on the quality of tobacco leaf. The partial least squares path model made clear the relationship between flue-cured tobacco growth and indexes of tobacco leaf quality after applying biochar, and systematically clarified the action mechanism of promoting flue-cured tobacco growth and quality of tobacco leaf by application of biochar. In summary, the optimum application amounts of biochar was 3 750 kg/hm2

Key words: flue-cured tobacco, biochar, partial least squares path model, quality of tobacco leaf