Influences of Air, Oxygen, Nitrogen, and Carbon Dioxide Nanobubbles on Seed Germination and Plant Growth

Abstract

Nanobubbles (NBs) hold promise in green and sustainable engineering applications in diverse fields (e.g., water/wastewater treatment, food processing, medical applications, and agriculture). This study investigated the effects of four types of NBs on seed germination and plant growth. Air, oxygen, nitrogen, and carbon dioxide NBs were generated and dispersed in tap water. Different plants, including lettuce, carrot, fava bean, and tomato, were used in germination and growth tests. The seeds in water-containing NBs exhibited 6-25% higher germination rates. Especially, nitrogen NBs exhibited considerable effects in the seed germination, whereas air and carbon dioxide NBs did not significantly promote germination. The growth of stem length and diameter, leave number, and leave width were promoted by NBs (except air). Furthermore, the promotion effect was primarily ascribed to the generation of exogenous reactive oxygen species by NBs and higher efficiency of nutrient fixation or utilization.

Aerated Irrigation and Pruning Residue Biochar on N2O Emission, Yield and Ion Uptake of Komatsuna

“…Therefore, hypoxic stress (situations in which the oxygen concentration is a limiting factor) might not occur in this soil and further injection of air into the soil through irrigation showed no effect on plant growth. This result differed with the study of Ahmed et al [29], who observed that air nano-bubbled into water not only had a negative effect on tomato growth also appeared to slow down the growth rates of the hypocotyl length compared to tap water. Li et al [30] reported that, once aeration had eliminated hypoxic stress, more air injected resulted in a reduction in root to soil contact which had a negative effect on the rhizosphere, and decreased tomato fruit yields.…”

Influence of micro/nanobubbles on clogging in drip irrigation systems

“…19 In summary, the studies of micro/ nanoaerated drip irrigation have been only focus on improving crop yield and quality, 13 promoting crop seed germination, and reducing environmental damage in the process of fertilizer production and use to date. 20 Few studies have focused on the inuence of micro/nanobubbles on the process of drip irrigation system clogging; these studies are still at the initial stage. However, in the actual crop production process, emitter clogging seriously restricts the performance, service life, and popularization of drip irrigation systems.…”

Structure and function of the endothelial surface layer: unraveling the nanoarchitecture of biological surfaces

“…Instead, we can reasonably assume that most NO is produced from O 2 in O 2 /N 2 nanobubbles. These are known to provide oxidants and reductants which might interact with arginine extracellularly to produce NO (Hickok et al ., 2013; Liu et al ., 2016; Ahmed et al ., 2018). More blood flow would tend to bring in more O 2 nanobubbles, and hence explain the correlation between increased flow, NO and vasodilation.…”