Acta Scientiarum Polonorum
Silvarum Colendarum Ratio et Industria Lignaria

Abstract A Scots pine tree plantation has been established in the area of the Experimental Forest Station of the Warsaw Agricultural University. The plantation consisted of seedlings colonised by different species and numbers of mycorrhizal fungi. Formerly, the experimental forest area was used as a tree nursery for over almost 40 years. Before plant-ing, the seedlings were grown on non-sterile peat-perlite medium. One half of the medium was supplied with mycorrhizal inoculum containing fungus Hebeloma crustuliniforme. In the nursery, the seedlings were treated with six fungicides, with untreated ones left as a reference. In spite of statistically significant differences in degree of mycorrhizal colonisation among different treatments, the seedlings had similar heights. After the first year, the degree of mycorrhizal colonisation of the seedlings grown in plantation became similar and exceeded 80%. The seedlings inoculated at the start of the experiment had significantly smaller height increments when compared with non-inoculated ones. Regardless of the treatment, survival rates of seedlings were high and averaged 97%.