EN
The aim of this study was to determine the effect of mycorrhization and hydrogel soil conditioning on conditions of growth of elder urban street trees, by determining their effects on soil available water and tree health status during the growing season. The experiment which was set up in the urban area in Poznan, where in 2006 mycorrhizal Aesculus Mikoflor (Mykoflor) and hydrogel Agroaquagel- P (Artagro) were applied. The observation of leaf damage and soil tension measurement at a depth 0.3 and 0.6 m were conducted in 2007–2010. The results of performed studies revealed a positive impact of additives on soil water availability. The effect varied at different depths and depended on weather conditions. The influence of soil additives on the degree of drought leaf damage was confirmed. No effect of soil additives on leaf damage by horse chestnut leaf miner were found.