Clients who have used our soil aeration service have observed a considerable increase the number of earthworms in their soil, as the soil structure allows the worms to move more freely. Improving the soil structure with sub-soiling also allows the soil to be more free draining, so that grass production improves during wet months. Since soil aeration also allows plants to increase their root depth,  grass growth also improves during both dry conditions.  Independent tests on farms in the UK, that have used the same hydraulic subsoiling system that Schwitzer Contracting uses, have shown an average dry matter increase of over 20% in a fifteen month period. This excellent return on investment is in line with the feedback we're receiving from Waikato farmers.