Promotion of Lettuce Growth by Application of Microbubbles in Nutrient Solution Using Different Rates of Electrical Conductivity and under Periodic Intermittent Generation in a Deep Flow Technique Culture System

作者：Park J S; Ohashi K; Kurata K; Lee J W^*

来源：European Journal of Horticultural Science, 2010, 75(5): 198-203.

• agricultural application
• Lactuca sativa
• macrobubbles
• pH

To investigate the effect of electrical conductivity (EC) in microbubbles-generated nutrient solution and periodic intermittent microbubble generation on lettuce growth, lettuce seedlings were cultivated at three different levels of EC (0 5, 1 0, or 2 0 dS m(-1)) with microbubbles or at 1 0 dS m(-1) with macrobubbles and under three levels of intermittent microbubbles generation (15, 30, and 60 mm h(-1)) in hydroponic culture for 2 weeks Leaf fresh weight (LFW) of lettuce treated with 0 5 and 1 0 dS m(-1) EC microbubbles was 1 54 and 1 43 times greater than those treated with macrobubbles Although LFW of lettuce grown in 2 0 dS m(-1) was significantly less than 0 5 and 1 0 dS m(-1) conditions, there was no difference in leaf dry weight (LDW) among the three ECs microbubble conditions There were no significant differences in the fresh and dry weights of lettuce treated with periodic intermittent generation of microbubbles for 15, 30 and 60 mm h(-1) (Cont) regardless of significant difference between microbubble and macrobubble treatments These results indicate that the microbubble generation in nutrient solutions can promote lettuce growth and intermittent microbubble generation for 30 mm h(-1) or less can be adapted effectively m hydroponic culture systems

• 出版日期2010-10