CONCENTRATIONS OF AVAILABLE PHOSPHORUS AND SULPHUR AND ACTIVITIES OF SOME HYDROLYTIC ENZYMES IN A LUVISOL FERTILIZED WITH FARMYARD MANURE AND NITROGEN

摘要

Concentrations of available phosphorus (PE-R), and sulphate sulphur (S-SO42-) as well as activities of alkaline (AlP) and acid phosphatase (AcP), and arylsulphatase were assayed in a Luvisol fertilized with various doses (0, 20, 40, 60, 80 t.ha(-1)) of farmyard manure (factor I) and nitrogen in mineral form (0, 45, 90, 135 kg ha(-1), factor II). PE-R and S-SO42- concentrations were significantly affected by fertilization with FYM and nitrogen, with the highest increase noted for soil samples taken from the objects with the manure dose 60 t ha(-1). Nitrogen used in the dose 135 kg ha(-1) increased significantly S-SO42- and decrease PE-R content as compared with their concentrations recorded for lower doses of this fertilizer. The highest concentration of available phosphorus was found in the sample collected in September. However, activities of phosphatases observed in the same sample were the lowest. The lowest arylsulphatase activity was noted in July, while sulphate sulphur concentrations in the same sample was the highest.