This article focuses on researching the development of a monitoring and control system for various environmental parameters based on the Internet of Things (IoT) to assist farmers in increasing crop yield in tea nurseries in certain areas of Thai Nguyen province. The system utilizes several types of IoT devices such as humidity sensors, temperature sensors, and light sensors to monitor three parameters including humidity, light, and temperature for the plant nursery. Additionally, the study involves building a mobile application that displays information on smartphones to receive data sent from sensors placed in the nursery environment via the Internet. Users can then monitor real-time data and make decisions to control devices such as water pumps for tea irrigation or adjust sensor parameters (increase/decrease, turn on/off light, temperature in the nursery). The testing of the system has shown that it indirectly helps tea growers efficiently manage nurseries, increase labor productivity, and bring about high economic value.