Seven treatments, ranging from raking only to various combinations with subsoiling, disc harrowing and tine ploughing or disc ridging, combined with fertilizer testing at 150 g NPK per plant, were tried on three sites in a Pinus pinaster plantation in northern Greece.Fertilization had a small negative effect on survival, which was attributed to weed growth being boosted by the fertilizer.The most important factor for tree height was the site, followed by the treatment; site treatment interactions were also present. Schist sites free of grass were found to be the best, followed by grassy clearings on schist, while sites on ultrabasic igneous rocks were the least favourable.Treatments including subsoiling gave the best results, while raking only was the worst. Disc ridging and disc harrowing effects were different on each site and were identified as the main source of the interaction. Thus, in terms of importance, ridging has a negative effect on grassy schist sites but a positive effect on grass-free schist sites, while on the latter harrowing has a negative effect.