EFFECT OF LIMING AND MINERAL FERTILIZATION ON THE ENZYMATIC ACTIVITY OF GREY-BROWN PODZOLIC SOILS FORMED FROM LOESS

摘要

The study involved a permanently fertilized field in the Rzeszów Foothills Region, on grey-brown podzolic soils formed from loess (Haplic Luvisols). Samples were taken from the Ap horizon in 2001, at the end of a 4-year study. Previous crops were cultivated using a 4-year cropping system: pasture sunflower, winter wheat, potato and spring barley. Various mineral fertilizers were applied during the study (NPK against a background of permanent Mg fertilization as well as NPK against a background of permanent Mg fertilization combined with liming). Liming was applied in the form of CaO (at the dose of 4 t of CaO ha~(-1)). The study included 14 fertilized objects, in 4 replications, according to a random sub-block system. Analysis of variance (ANOVA) was used for the statistical processing under a double classification: liming (A) and mineral fertilization (B) -independently of liming. Liming was found to increase the enzymatic activity of dehydrogenases and phosphatases, whereas mineral fertilizationwas found to decrease the enzymatic activity of dehydrogenases, proteases and phosphatases. The combined effect of liming and mineral fertilization (AB) led to an increased enzymatic activity of dehydrogenases, phosphatases and proteases in soil of themajority of the limed fertilized objects.