Possibilities and limits of direct injection of herbicides for site-specific weed control

This paper deals with the requirements for direct injection systems for site-specific herbicide application based on weed detection. The type of weed detection and the resulting detection time is the crucial factor for the whole weed detection system (on-line or off-line) and thus for the performance, especially for the acceptable delay time of the direct injection system. Furthermore physical properties and application rates of the herbicide have influence on the design of the direct injection system. A test assembly for direct injection is presented, which allows the measuring of mixing accuracy and delay time depending on the position of injection.