From the discovery of nanomaterialsNanomaterials to their integration into agricultural practices, this chapter serves as a gateway into the fascinating world where science meets the soilSoil. NanomaterialsNanomaterials have attracted considerable attention from researchers in recent years due to their unique architecture and small dimensions. In plantPlant research, however, nanotechnologyNanotechnology is still in its advancing stage. NanotechnologyNanotechnology would significantly boost agricultural output and provide enormous prospects for cropCrops enhancement. Numerous publications exist demonstrating the effective enhancement of agronomic properties through the use of nanomaterialsNanomaterials. NanotechnologyNanotechnology now, has emerged as a promising field in plantPlant science, offering innovative solutions to enhance plant growthPlant growth, productivity, and sustainability. The utilization of nanomaterialsNanomaterials in plantPlant science encompasses various applications, ranging from nanoscale delivery systemsNanoscale delivery systems for nutrients and pesticidesPesticide to nanosensors for monitoring plantPlant health and environmental conditions. This chapter, also will provide an overview of the key areas where nanomaterialsNanomaterials are making significant contributions. NanomaterialsNanomaterials, which are being used in plantPlant science need specific characterization techniques, as their wide range of usage as nanostructures has rapidly sparked intense attention. Numerous methods have been employed to evaluate the dimensions, crystallographic arrangement, elemental makeup, and several other physical attributes of nanoparticlesNanoparticles (NPs). Since every technique has different benefits and drawbacks, choosing the optimal methodology is usually challenging, and demands a combinational characterization approach. Furthermore, due to the growing importance of nanoparticlesNanoparticles (NPs) in fundamental research and applications, researchers from various fields have to overcome the difficulties associated with reliability and reproducibility in characterizing nanoparticlesNanoparticles (NPs) after synthesis and subsequent processing phases. Overall, this chapter provides a comprehensive understanding of the techniques used for the characterization of nanomaterialsNanomaterials in plantPlant sciences.