Autonomous farming systems are moving rapidly from experimental prototypes into commercial and operational agricultural settings. Autonomous tractors, robotic weeders, drones, harvest-assist systems, and sensor-guided machines promise to address labour shortages, improve operational efficiency, and support more precise field management. Yet the governance arrangements needed to ensure that these systems remain safe, understandable, and accountable have not developed at the same pace. The central problem is not only whether autonomous machines can perform agricultural tasks accurately. It is whether farmers, workers, contractors, and rural communities can understand, supervise, question, override, and hold these systems accountable when they act in complex farm environments. Without deliberate attention to trust calibration, human override, explainability, and accountability, autonomous farming may produce technically impressive but socially fragile systems. This article develops a Human-Centred Governance Framework for autonomous farming. The framework is designed around four pillars: calibrated trust, meaningful human override, explainable decision-making, and clear accountability structures. Its purpose is to shift governance attention from machine capability alone toward the conditions under which autonomous systems can be responsibly integrated into agricultural work. The proposed framework shows that human-centred governance is not an optional ethical supplement to autonomous farming. It is a practical requirement for safe deployment, legitimate adoption, and accountable operation. By integrating trust, override, explainability, and accountability, the framework provides guidance for farm managers, technology developers, regulators, and agricultural service providers.