Precision agriculture leverages advanced technologies to optimize agricultural practices, improve crop yields and ensure sustainable farming. Wireless Sensor Networks (WSNs) play a pivotal role in precision agriculture by providing real-time monitoring and data collection. This review focuses on the implementation of NPK (Nitrogen, Phosphorus and Potassium) sensors within WSNs for precision agriculture. It explores the fundamental principles of WSNs, the importance of NPK in crop health, the various types of NPK sensors used, their integration into WSNs and the benefits and challenges associated with their use.
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