Effect of organic fertilization and mulching on the growth of European larch (Larix decidua L.) and biological activity of soils

摘要

The purpose of the study was to determine the influence of organic fertilization and mulching withectohumus on the growth of two-year old European larch seedlings (Larix decidua L.) and biological properties of soilsin forest nursery under conditions of micro-sprinkler irrigation. The experiments were carried out on the rusty soil inforest nursery Bia3e B3ota (Forest District Bydgoszcz). The use of organic fertilization with treated sewage sludge withthe bark or sawdust additives, did not differ significantly the growth parameters of seedlings. Mulching with the caphumusfrom the fresh coniferous forest significantly increased the height and the fresh mass of above-ground parts oftwo-year old European larch seedlings. The use of sewage sludge with the bark or sawdust additives did not effectnegatively on the state of mycorrhizal structure in the juvenile phase of seedlings. The treatment of mulchinginfluenced positively on the biological condition of nursery soils – the dimension of saprophage oribatid mites wascharacterized by the manifold increase.