IMPACT OF ORGANIC AND POTASSIUM FERTILIZA TION ON POTASSIUM DYNAMICS IN CALCAREOUS SOILS - APPLICATION OF AN ELECTROULTRAFILTRATION SYSTEM

Two calcareous soils amended with different organic and inorganic fert ilizers were incubated in pots for 6 months in an experimental greenho use. The influence of different K and P levels on the evolution of K a vailability in soil with added earthworm humus or se wage sludge, was studied by EUF. The results have shown that the content and evolution of EUF-extractable potassium is significatively influenced by the init ial addition of K to the soil. The content of K retained (K-II) is aff ected by the fixation index of the soil.