ИСТИНА

Lilac (Syringa vulgaris L.) is a popular ornamental shrub. Lilacs, intended for landscaping of urban areas, are grown in plant nurseries, where soil conditions are maintained at favorable for plants levels, that results in a high level of lilacs ornamentality. When lilacs planting in urban soils, their condition may deteriorate due to the characteristics of the soil cover, which is subject to a number of anthropogenic loads. Lilac shrubs that are to be planted in the city need to tolerate heat, drought, poor drainage and aeration, soil compaction, low fertility, high pH, deicing salts, detergents and air pollution. In order to improve the properties of degraded urban soils they are often covered with a shallow layer of fertile soil, which are mixed with underlying material. So lilac root systems are expected to 'perform' in a variety of difficult and stressful urban soil environments. The investigation was carried out on in the campus zone of Lomonosow State university. The decorative quality of lilac shrubs, planted in campus area was greatly influensed by anthropogenic loads. They led some changes in soil properties, such as pH and mobile phosphorus increase, modification soils organic matter nature and the accumulation of some heavy metals. This leads to the disbalance in lilac plants nutrion. Low acidity, hich content of available phosphorus and soil organic matter lead to convertation of available forms of trace elements in inactive compounds, that are not absorbed by plants. This reduces abundant flowering of lilac shrubs. The disproportion in admission of trace elements causes leaves chlorosis and necrosis, which in turn, contributes to the occurrence of fungal diseases.