Zmiany odczynu i właściwości sorpcyjnych gleby piaszczystej pod wpływem wieloletniego nawożenia mineralnego, organicznego i organiczno-mineralnego

The studies covered a long term experiment founded in Laskowice Oławskie in 1957 on the soil formed out of light loamy sand. Fertilization systems used in the experiment did not differ the soil acidity although the lowest pH values as well as the highest hydrolitic acidity were found on the NPK treated object. Increasing of soil acidity on this object favored to eliminating Ca and Mg ions from the soil sorption complex. It was expressed by decreasing rate of charge sorption complex with alcalic cations on the NPK treated object. The highest soil cation exchange complex (CEC) was found on the object, where farmyard manure with mineral fertilizers were used.