不同氢氧化镁施用量对烤烟生长、化学成分和经济性状的影响

Effects of Magnesium Hydroxide Application Level on Growth, Chemical Composition and Economic Characters of Flue-Cured Tobacco

摘要: 本文研究不同氢氧化镁用量对烤烟生长、化学成分和经济效益的影响。结果表明，施用氢氧化镁能促进烟株的生长发育，改善烤烟的株高、最大叶宽、最大叶面积、茎围及叶片数。施用氢氧化镁能减低烟叶烟碱含量，降低9.5%~34.1%；提高烟叶钾含量，增加1.7%~56.9%；提高烤后烟叶的总糖含量，还原糖、总氮、糖碱比、氮碱比及钾氯比趋于适宜值；能显著增加烤后烟叶的经济效益，产值增加16.4%~23.9%。17.5 kg/666.7m2的氢氧化镁施用水平下，烟叶质量最好、化学成分协调、经济效益最佳。

Abstract: Effects of magnesium hydroxide application level on growth, chemical composition and economic benefits of flue-cured tobacco were studied in the paper. The results showed that application of magnesium hydroxide could promote the growth and development of tobacco plant, improve the plant height, maximum leaf width, maximum leaf area, stalk circumference and leaf number, reduce nicotine content (9.5% - 34.1% reduction), increase potassium content (increase by 1.7% - 56.9%), and increase total sugar content. The results showed that reducing sugar, total nitrogen, sugar alkali ratio, nitrogen alkali ratio and potassium chloride ratio tended to the appropriate value, which could significantly increase the economic benefits of flue-cured tobacco leaves and increase the output value by 16.4% - 23.9%. Under the application level of 17.5 kg/666.7m2 of magnesium hydroxide, the quality of tobacco leaves was the best; the chemical composition was coordinated and the economic benefit was the best.