采用两种农业措施降低烟草上部烟烟碱含量技术研究

Study on Two Agricultural Measures to Reduce Nicotine Content in Upper Tobacco Leaves

摘要: 开展了在烟叶打顶后留4~5片烟杈和在上部烟成熟采烤期用农具除掉部分根系降低上部烟烟碱含量技术研究。留叶法试验结果表明：留叶时间10天对上部烟叶有很好的降碱效果，达35.20%，留叶时间15天也有较好的降碱效果，达13.80%，留叶时间5天则没有降碱效果。伤根法试验结果表明：伤根5 cm深，切面20 cm对上部烟叶有很好的降碱效果，达29.70%，而伤根10 cm、15 cm深，切面20 cm降碱效果分别为6.50%和4.50%，降碱效果不明显。打顶后留叶和伤根降碱对烟叶产质量几乎没有影响。

Abstract: The technology of leaving 4~5 tobacco leaves after topping and removing some roots with farm tools to reduce nicotine content in upper tobacco leaves during the mature period of upper tobacco leaves was studied. The results of leaf retention test showed that 10 days of leaf retention had a good alkali reduction effect on upper tobacco leaves, reaching 35.20%, 15 days of leaf retention also had a good alkali reduction effect, reaching 13.80%, but 5 days of leaf retention had no alkali reduction effect. The results of root-cutting test showed that the root-cutting depth of 5 cm and the section of 20 cm had a good alkali-reducing effect of 29.70% on the upper tobacco leaves, while the alkali-reducing effects of the root-cutting depth of 10 cm and 15 cm and the section of 20 cm were 6.50% and 4.50% respectively, but the alkali-reducing effect was not obvious. Leaving leaves after topping and root injury and alkali reduction have little effect on the yield and quality of tobacco leaves.