Leaf lettuce (Lactuca sativa L. 'L-121') growth in hydroponics with different nutrient solutions used to generate ultrafine bubbles
Leaf lettuce (Lactuca sativa L. 'L-121') growth in hydroponics with different nutrient solutions used to generate ultrafine bubbles
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DOI：
10.1080/01904167.2021.2006227
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发表时间：
2021-11-13
影响因子：
2.1
通讯作者：
Yamaji, Keiko
中科院分区：
文献类型：
--
作者：
Kobayashi, Noriko;Yamaji, Keiko
水培系统中安装了微气泡(FB)和超细气泡(UFB)发生器以促进植物生长。然而，由于对UFBs的作用机理还不清楚，其应用受到了限制。以自来水(对照)、自来水(标准自来水)和硝酸钙溶液(ORL)配制营养液，研究UFBs对水培生菜生长的促进作用。然后在相同的营养浓度和环境条件下比较了三个处理之间的差异。采收后测定地上部鲜重、干重、营养元素(锌、钾、锰、铁、铜、钙、镁)含量和总营养元素含量。STD和ORL处理的地上部鲜重和干重均高于对照，但STD和ORL处理间差异不显著。STD和ORL处理植株对营养元素的吸收高于对照处理。此外，STD处理和ORL处理对锰的吸收也不同。结果表明，在STD和ORL处理中，UFBs产生的活性氧类物质影响植物的生长促进作用。UFB的特性还允许提供足够的营养物质，从而实现快速增长。此外，我们认为，使用的溶液类型改变了FBS和UFBs的性质，这反过来又影响了植物对养分的吸收。
Fine bubble (FB) and ultrafine bubble (UFB) generators have been installed in hydroponic systems to promote plant growth. However, their application is limited because the mechanism of the effect of UFBs is not well understood. We aimed to evaluate the effect of UFBs on promoting leaf lettuce growth in hydroponics using nutrient solutions prepared with tap water (Control) and two UFB water-tap water (standard, STD) and calcium nitrate solution (original, ORL). We then compared the differences among the three treatments under the same nutrient concentration and environmental conditions. The shoot fresh weights, dry weights, nutrient element (Zn, K, Mn, Fe, Cu, Ca, and Mg) concentrations, and total nutrient element quantity were measured after harvesting. The shoot fresh and dry weights were higher in the STD and ORL treatments than in the control, but no difference was noted between the STD and ORL treatments. Plant nutrient element uptake was higher in the STD and ORL treatments than in the Control treatment. Additionally, Mn uptake differed between the STD and ORL treatments. The results indicated that plant growth promotion in the STD and ORL treatments was affected by reactive oxygen species generated by UFBs. UFB properties also allowed for the supply of sufficient nutrients enabling rapid growth. Furthermore, we suggest that the type of solution used altered the properties of the FBs and UFBs, which in turn influenced the uptake of nutrients by the plants.