This article provides an in-depth analysis of how blockchain technology is driving innovation in network systems for smart agriculture IoT networks. It begins by exploring the foundational principles of blockchain, focusing on its decentralized nature, cryptographic security, and consensus mechanisms, which ensure data integrity and transparency in agricultural IoT ecosystems. The article then delves into the specific applications of blockchain within smart agriculture, such as enhancing supply chain transparency, improving data exchange between IoT devices, and optimizing resource distribution on farms. Challenges to blockchain adoption in this sector are also addressed, including scalability, performance issues, security concerns, and regulatory challenges unique to agriculture. To overcome these hurdles, the article discusses cutting-edge solutions like Layer 2 scaling, advanced cryptographic methods, and sustainable consensus models that can support large-scale IoT networks. Ultimately, the article envisions blockchain as a key enabler for evolving smart agriculture networks, driving increased efficiency, reliability, and security in IoTenabled farming operations, and paving the way for a more connected and sustainable agricultural future.