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WSN (wireless sensor networks) is a widely used IoT (Internet of Things) technology that plays an important role in IoT applications. In agriculture, an optimal irrigation system is needed for high output at the lowest cost and with the least amount of energy. WSN is an important technology for maximising irrigation. The irrigation system based on 6lowpan technology is presented in this research work.The 6LoWPAN network was simulated using Contiki OS and the Cooja simulator. Contiki OS provides the ability to evaluate network output by simulating nodes with Tmote Sky. Smart irrigation systems are used to reduce water and energy consumption while also allowing remote control and monitoring of irrigation systems.Output metrics such as throughput, latency and packet loss were used to evaluate the performance of an irrigation system using 6LoWPAN specifications.