A continuous dry particulate matter injection device (1), and more in particular a device for use in a fertigation application in which a soluble matter, such as a fertilizer, is suspended and/or dissolved into the irrigation water in order to use the irrigation system and irrigation water as a delivery system for the soluble matter, in particular a soluble fertilizer. To this end, the device includes at least one feed device (2), suitable for feeding particulate matter, and connected, by a first connection pipe (3), to the top of a vertically positioned slurry mixing chamber (5), located under the first connection pipe (3), and a pressurized mixing tank (12), connected to the bottom of the slurry mixing chamber (5) by a second connection pipe (8). The device is operated in a continuous cycle.
