The temperature-gradient tunnel provides a range of constant temperatures simultaneously within one chamber while maintaining other environmental variables at levels which adequately match most of the standards which are current in modern plant growth cabinets.

This type of tunnel make an extension of the temperature range down to 5 °C. It Provided an enlargement of the growing space to increase the work output and allow factorial combinations of temperature with other environmental variables. We Introduce data monitoring and control fuction with the provision of controlled diurnal fluctuations of temperature with the help of computer. A radically new system provides both for heating and humidification, if required, and also satisfies the criteria for improved access.