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以美国大速生生菜为试材,在营养液中添加不同浓度的褐球固氮菌,研究了其对生菜叶片数、叶长、叶宽、茎粗、产量等形态指标和叶绿素、维生素C、硝态氮含量等生理指标的影响,为提高水培生菜的产量和品质提供参考依据。结果表明:施用褐球固氮菌均可以促进生菜的生长发育,其中以300倍和400倍效果最好;均降低了营养液的pH和显著降低了EC值;400倍液褐球固氮菌可以提高生菜的叶绿素含量,但显著增加了叶片中硝态氮的含量,500倍液褐球固氮菌可以极显著提高维生素C的含量。
With the rapid growth of the lettuce in the United States as test material, nitrogen-fixing bacteria of brown ball were added to the nutrient solution to study the effects of chlorophyll, vitamin C and nitrate on the leaf number, leaf length, leaf width, stem diameter and yield of lettuce, Nitrogen content and other physiological indicators, to improve the yield and quality of hydroponic lettuce provide a reference. The results showed that the growth of lettuce could be promoted by Azotobacter sphaerocephala, 300 and 400 times higher than that of the control, both decreased the pH of nutrient solution and significantly reduced the EC value. Lettuce chlorophyll content, but significantly increased the nitrate content of leaves, 500 times Azotobacter vinelandi can significantly increase the vitamin C content.