Abstract: A subterraneous treatment apparatus for injecting controlled amounts of fertilizer or other nutrient materials into the soil adjacent the root system of plants. The apparatus includes a closed cylindrical container for the storage of fertilizer and a multi-valve holding chamber assembly consisting of a cylindric holding chamber below the container to receive a measured amount of fertilizer and a terminally disposed upper inlet valve and a lower discharge valve to control the flow of fertilizer therethrough. The apparatus further includes an elongated tube which extends below the holding chamber and is provided with a ground-penetrating section to facilitate insertion into the ground. The multi-valve holding chamber assembly prevents a stream of water from entering the closed container and permits a precise amount of fertilizer to be released into the elongated tube for subterraneous injection to the root zone.