Abstract
The effect of different admixtures of gravel to soil on freshly planted urban trees ( Acer platanoides L., Tilia europaea L., T. × euchlora K. Koch, Tilia × europaea L. var. pallida and Platanus × acerifolia (Ait.) Willd.) was investigated. Expanded clay proved to be most favourable for Tilia. It improved soil water regime and aeration. Lava rock was deleterious for Tilia but not for Acer. The effect on trees was not much different in the case of vertical gradients of the admixture compared to homogeneous mixtures. A horizontal gradient with river gravel resulted in a slight stimulation of root development in all species examined in the third year after planting.
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