The problem of the influence of different parameters on the soil penetration resistance has been discussed. It has been stated that at least ten variables affect the measured values, and that makes the comparison of the results difficult. The influence of all parameters has been discussed.
The results of the investigations on soil aggregation conducted in the Institute of Agrophysics, Soil Physics Department in Lublin in the period 1971-1986 have been presented. The methods of investigation, and the methods of describing soil aggregation and soil aggregates' water resistance have been worked out. The data concerning the influence of soil aggregation onwater retention, and water-air relations, water and air permeability, diffusivity and evaporation have also been included.
W pracy przedstawiono materiał i metodyke badań charakterystyk hydrofizycznych gleb ornych Polski będących podstawą do konstuowania bazy danych i tworzenia map ich właściwości.