Joaquin Camilo Tololiu and Refgiufi Patria Avrianto (2026) “DESIGN AND DEVELOPMENT OF AN IOT-BASED SOIL FERTILITY MONITORING SYSTEM USING A 7-IN-1 NPK SENSOR AND AI-BASED CROP PREDICTION MODEL”, International Journal of Social Science, Educational, Economics, Agriculture Research and Technology (IJSET), 5(8), pp. 4700–4708. doi: 10.5281/zenodo.23190021.