REVIEW ON NPK SENSOR USED ON SOIL

This review article discusses the importance of soil fertility in agriculture and the role played by NPK (Nitrogen, Phosphorus, and Potassium) in plant growth. It explores a few NPK sensor technologies utilizing electrochemistry, optics, capacitors, and biosensors for soil monitoring in real time. The article mentions developments with IoT-based smart farming, augmenting precision agriculture as well as eco-sustainability. Various studies and various sensor models have been read and studied to confirm their accuracy and effectiveness as well as their limitations. Future studies focus on sensor longevity, AI training, and multi-sensor fusion for increased precision farming.