This paper presents the results of a study on the effect of the soil aggregate sizes of Orthic Podzol and Haplic Phaeozem on the values of coefficients of unsaturated water conductivity and diffusivity. It was found that extreme values of the coefficient of unsaturated water conductivity in Orthic Podzol varied from 0.2 10³ cm day⁻¹ for aggregates of 0.25-0.5 mm to 0.8 10⁻⁹ cm day⁻¹ for aggregates of 5-10 mm, and in Haplic Phaeozem - from 0.2 10³ cm day⁻¹ for aggregates of 0.25-0.5 mm to 0.6 10⁻⁹ cm day⁻¹ for aggregate fractions of 3-5 and 5-10 mm. Extreme values of the water diffusivity coefficient in Orthic Podzol were 0.13 10⁶ cm² day⁻¹ for aggregates smaller than 0.25 mm and 0.96 10⁻³ cm² day⁻¹ for aggregate fraction of 5-10 mm, and in Haplic Phaeozem 0.97 10⁵ cm² day⁻¹ for aggregate fractions of 0.25-0.5 mm and 0.6 10⁻³ cm² day⁻¹ for aggregates larger than 3 mm. The study showed that the character of the relation of the dynamic water characteristics, i.e. the coefficients of water conductivity and diffusivity, to soil water content and its potential is directly affected by static water characteristics, i.e. the form of the water retention curves of the soils. The study also showed that water movement in the unsaturated zone of the soils is reflected, with good approximation, by both the water conductivity coefficient and the water diffusivity coefficient.
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