Sensors are small devices that are used to measure or detect natural Earth conditions such as motion, heat, or light, and represent this in analog or digital form. In the agricultural sector, sensors are used in drones, weather stations and robots. Data collected by these sensors is used for monitoring and optimizing crops and protecting the crops from adverse impacts of the environment. Optical sensors are agricultural sensors that involve the use of various frequencies of light to measure the properties of soil. It can determine organic matter in the soil, soil moisture and clay content in soil. Electrochemical sensors are used to gather information about chemical data of soil for detecting the nutrients present in the soil. This book provides a detailed explanation of the applications of sensing technology in agriculture. A number of latest researches have been included to keep the readers updated with the global concepts in this area of study. The book aims to equip students and experts with the advanced topics and upcoming concepts in this area of agricultural technology.