Assessment of mineral and organic fertilization impact on selected physicochemical properties of soil

摘要

The assessment of fertilization impact on selected soil properties was made in a pot experiment in 2003-2005. The research was conducted on loamy sand, sandy silt loam and medium silt loam. Two sewage sludges from municipal mechanical -biological sewage treatment plants and compost produced of plant wastes were used for the experiment. Mineral fertilization caused the greatest changes of soil reaction. Smaller doses of organic materials reduced soil acidification. The value of electroconductivity raised most in effect of applied fertilization (after the first year of investigations) in the soil with the lightest texture. Greater diversification in the soils from organic treatments resulted rather from the applied dose than from the kind of fertilizer. Fertilization did not cause any major changes in the soil soprtion capacity. Organic carbon content in soils did not change significantly following the application of sewage sludges and compost in comparison with farmyard manure treatment. The content of zinc and manganese mobile forms increased in all treatments after three years. No similar changes were found for cadmium; its contents were similar after the first and third year. A considerable sulphur load supplied to the soils through organic treatment, particularly with sewage sludges and farmyard manure was reflected in the increased content of sulphate sulphur in the soils. After three-year period of investigations the tendency for the highest concentrations of sulphate sulphur in soils (particularly in light and heavy ones) fertilized with sewage sludges was maintained. The increase in this component content in soil after farmyard manure fertilization proved short lived.