Abstract: Nanobubbles (NBs) are tiny bubbles with size range of less than 1 μm. They have unique physicochemical properties, such as high stability, strong oxidative ability, and high mass transfer efficiency. NBs technique has been extensively applied in wastewater treatment, soil remediation, biomedicine, and agricultural irrigation. Little are known about the effects of NBs on the soilcrop system and the underlying mechanisms, although the available studies point towards it conferring the advantage of crop growth and stress resistance. Here, we reviewed the generation methods and properties of NBs, as well as the effects and potential mechanisms of NBs technique on soil-crop system. Further, we summarized the effects of NBs on soil physicochemical characteristics, microbial community structure, extracellular enzyme activities, seed germination, root development and leaf photosynthesis performance. Finally, we recommend the application and research directions of NBs technique in future crop production.

Key words: micro-nanobubble, crop yield, soil organism, C- and N-cycling, agroecosystem