The increasing breadth of water-based research reflects the central importance to agricultural and environmental science while highlighting the hydrologic subdisciplines' fractured nature. This becomes crucial for agrohydrology, with significant hydrological processes and management in agricultural production and food security. The emerging concept of the Critical Zone (CZ) science can be introduced to boost the integration of agrohydrologic theories and approaches. We, therefore, advocate a new research scope of ‘‘CZ Agrohydrology’’ to embrace the transdisciplinary nature of water-based research. Here, we solicit contributions to pose a knowledge gap of CZ Agrohydrology given a relevant interplay of CZ processes and services in hydrologic subdisciplines. We welcome contributions that investigate hydrological processes altering the agricultural water allocations and efficiency, water quantity and quality issues in diversified farm systems, groundwater’s roles interacting with farmland ecosystems and climate change, and new sensor technologies, and isotope-based and modeling approaches to advance agricultural developments.

• A - Atmospheric Sciences
• EP - Earth and Planetary Surface Processes
• NS - Near Surface Geophysics