1. Sensor Technologies for Precision Soil Nutrient Management and Monitoring
2. Jianhan Lin, Maohua Wang, Miao Zhang, Yane Zhang, Li Chen “Electrochemical sensor for soil nutrient detection:opportunity and challenge” Key Laboratory of Modern Precision Agriculture System Integration, Ministry of Education, Beijing, China, 100083, 2011
3. Yufeng GE, J. Alex Thomasson, Ruixiu Sui, “Remote sensing of soil properties in precision agriculture: A review” Front. Earth Science, 5(3): 229–238, 2011.
4. Sensor Technologies for Precision Soil Nutrient Management and Monitoring
5. Peter Scharf “Managing nitrogen with crop sensors: whyand how” University of Missouri (greenseekar)