Researchers from the United States, Israel, and several other countries gathered at Penn State University for a workshop on nanobubble enrichment in agricultural systems. The workshop brought together expertise in plant and soil sciences, environmental engineering, microbiology, nanotechnology, controlled-environment agriculture, and field-scale implementation to examine how nanobubbles could contribute to more productive and sustainable agriculture.
Nanobubbles nanoscale gas bubbles that are dispersed in water have attracted growing interest because of their unusual stability and potential to enhance gas delivery and interfacial processes. Workshop participants presented results from hydroponic systems, soil-grown crops, greenhouse studies, and field experiments showing potential benefits including enhanced root development and plant growth, improved oxygen conditions in the root zone, changes in soil and rhizosphere microbial communities, and increased resilience to environmental stresses. In some field studies, nanobubble irrigation was also associated with improved plant water status and crop productivity.
At the same time, one of the most important insights from the workshop was that nanobubble effects are not universal. Responses can vary among crops and even among genotypes of the same crop, and outcomes depend on soil properties, water chemistry, gas identity, nanobubble generation method, environmental conditions, and agricultural management. In some experiments, strong benefits were observed, while under apparently similar conditions little or no response occurred. The central scientific challenge is therefore shifting from demonstrating that nanobubbles can produce beneficial effects to understanding when, why, and under which conditions those effects should be expected.
This understanding is essential for realizing the potential contribution of nanobubbles to sustainable agriculture. Better control of gas delivery in the root environment could support plant growth, nutrient cycling, microbial processes, and crop resilience without necessarily increasing chemical inputs. Nanobubbles may be particularly useful in controlled-environment agriculture, irrigation systems, and conditions in which oxygen availability or environmental stress limits productivity. However, participants emphasized that improvements in crop performance must ultimately be evaluated together with energy demand, water use, operating costs, and scalability to determine whether laboratory or greenhouse benefits translate into meaningful agricultural gains.
The discussions also identified several priorities for advancing the field. Standardized generation, characterization, reporting, and experimental controls are urgently needed so that results from different laboratories and agricultural systems can be compared. Fundamental research is needed to determine the physical and chemical behavior of nanobubbles in complex agricultural environments and to distinguish effects caused by dissolved gases from those uniquely associated with nanobubbles. Mechanistic studies should connect nanobubble properties with changes in soils, microbial communities, plant physiology, and ultimately crop performance. Participants also highlighted the value of sharing unsuccessful as well as successful results, which could help identify the conditions in which nanobubble technologies are and are not likely to provide benefits.
These discussions are being translated into a jointly authored perspective paper and research roadmap. Rather than another broad review of nanobubble applications, the group aims to identify the critical knowledge gaps that currently separate promising observations from predictable agricultural applications. In the near term, the priority is rigorous fundamental and applied research. As stronger mechanistic understanding and standardized datasets emerge, predictive and data-driven approaches may eventually help identify the combinations of crop, soil, water chemistry, climate, and nanobubble properties most likely to produce a beneficial response. Promising applications can then move toward field validation, economic analysis, and responsible scale-up.
The scientific leadership team included Prof. Ines Zucker (Tel Aviv University), whose research focuses on environmental nanotechnology, interfacial processes, and nanobubble transport in porous systems; Dr. Shahar Baram (Volcani Institute), whose work focuses on soil processes, plant nutrition, and sustainable agriculture; Prof. Onur Apul (Penn State University), whose research includes nanobubble generation, characterization, and environmental applications; and Prof. Sergi Garcia-Segura (Arizona State University), who studies nanobubble-enabled technologies, interfacial processes, and agricultural applications. Prof. Wen Zhang of the New Jersey Institute of Technology contributed additional expertise in colloidal interfaces, nanobubble science, environmental systems, and agricultural applications.
The workshop ultimately highlighted both the promise and the maturity challenge facing the field. Nanobubbles have produced compelling results across a growing range of agricultural systems, but realizing their full potential will require moving from isolated demonstrations toward mechanistic understanding, comparable experiments, and predictive implementation. By bringing together researchers from complementary disciplines, the workshop provided an important step toward that goal.
