The contribution of different particle-size fractions to the supply ofsandy loam soddy-podzolic soil with exchangeable and unexchangeablepotassium

摘要

The application of different rates of potassium fertilizers to sandy loamy soddy-podzolic soil was studied in a long-term experiment. A significant increase in the content of exchangeable and unexchangeable potassium in the silt fractions was found in all experimental treatments with the application of potassium fertilizers, as compared to the NP treatment. A high direct linear correlation was revealed between the contents of exchangeable and unexchangeable potassium in the soil as a whole and in all particle-size fractions.