The advancement of smart agriculture relies heavily on efficient Machine-to-Machine (M2M) communication among distributed wireless sensor nodes. However, existing routing protocols often fail to meet the stringent energy and scalability requirements of agricultural deployments. This paper introduces LPRP, a Low-Power Routing Protocol designed explicitly for resource-constrained wireless sensor networks (WSNs) in smart farming environments. LPRP features energy-aware, adaptive routing, mobility resilience, and cluster-based data aggregation to optimize network performance under limited power budgets. Simulations conducted in NS-3 demonstrate that LPRP significantly outperforms conventional protocols such as AODV, LEACH, and RPL in terms of packet delivery ratio, network lifetime, and average energy consumption. The proposed approach achieves over 95% delivery accuracy and reduces energy usage by up to 22%, extending operational lifespan without sacrificing reliability or latency. These results highlight LPRP’s suitability as a scalable and sustainable communication backbone for next-generation precision agriculture systems.