IoT-Enabled Smart Agriculture System with Machine Learning-Based Precision Irrigation and Crop Yield Prediction for Semi-Arid Farming Regions
Abstract
Agriculture contributes approximately 17–18% of India's GDP and employs over 58% of the workforce, yet remains highly vulnerable to climate variability, inefficient water use, and delayed pest and nutrient interventions due to limited access to real-time field monitoring. Precision agriculture driven by Internet of Things (IoT) sensor networks and machine learning analytics offers a scalable pathway to address these challenges, but adoption in smallholder semi-arid farming contexts in states such as Maharashtra and Rajasthan has been limited by system cost, power constraints, and connectivity. This paper presents the design, implementation, and field validation of a low-cost IoT-based smart agriculture system deployed across 12 field plots (0.5 hectare each) in Solapur district, Maharashtra. The system integrates soil moisture sensors (capacitive, ±2% accuracy), DHT22 temperature-humidity sensors, NPK electrochemical sensors, and LDR light intensity sensors connected via ZigBee mesh network to a Raspberry Pi 4 edge gateway. A Random Forest regression model trained on 60 days of multi-parameter sensor data achieves R² = 0.94 for irrigation volume prediction, reducing water consumption by 38% versus traditional flood irrigation while improving crop yield across five crop types (rice, wheat, maize, soybean, groundnut) by an average of 31.4%. System end-to-end latency for edge-processed irrigation decisions averages 12.3 ms at the 50th percentile versus 41.7 ms for cloud-only processing, confirming the edge architecture's suitability for real-time actuator control. Total hardware cost per plot is estimated at INR 8,400, with a projected payback period of 1.8 cropping seasons based on observed yield improvement and water cost savings.
Keywords: Internet of Things, precision agriculture, smart irrigation, random forest, soil moisture, edge computing, ZigBee, Raspberry Pi, crop yield prediction, semi-arid farming
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