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The experiment was set on lessive soil developed from heavy loamy sand. The aim of the study was to evaluate the effect of 500 kg S ha-1 year-1 dose on intensification of respiration activity, intensification of amonification and nitrification processes in soil. The soil was amended with liquid manure (120 m3 ha-1 year-1) before acid rainfall dose application. Nitrification process was inhibited by acidic rainfall but stimulated by liquid manure fertilization. Sulphating and liquid manure applied stimulated the respiration activity and intensification of amonification processes.

Nawożenie osadami ściekowymi wpływa nie tylko na rośliny, właściwości fizyczne i chemiczne gleb, ale także na parametry mikrobiologiczne. Badania nad wpływem osadu ścieków mleczarskich na właściwości mikrobiologiczne gleb były głównie krótkoterminowe i prowadzone w warunkach laboratoryjnych. Dlatego też badania prezentowane w niniejszej pracy przeprowadzone zostały w warunkach polowych w różnych latach oddziaływania osadu ścieków mleczarskich na wybrane właściwości mikrobiologiczne gleby brunatnej. Przeprowadzone badania wykazały, że osad ścieków mleczarskich na ogół stymulował rozwój drobnoustrojów. Najwyższą liczebność mikroorganizmów stwierdzono w drugim roku oddziaływania odpadu.

The aim of the present study was evaluation of the influence of sewage sludge from dairy on the enzymatic activity of soil. Soil samples were taken from the experiment estabilished on brown soil. The experiment included the following treatments: 1 – soil + sewage sludge from dairy, 2 – soil + sewage sludge from dairy + farmyard manure (FYM), K – soil control, no sludge. Sewage sludge was applied at the rate 22 t ha-1 yr-1 and FYM at the rate 20 t ha-1 yr-1. In the field experiment the effect of sewage sludge was studied for the activity of the following soil enzymes: dehydrogenases, protease and urease. It was found out that the effect of sewage sludge on the soil enzymatic activity was related to the kind of enzyme under study. Sewage sludge stimulated protease and dehydrogenases activity and inhibited urease activity.

The aim of the study was evaluation of the influence of sewage sludge from dairy on the numbers of the ammonifying and nitrifying bacteria and on the nitrification and amonification rates. The field experiment was estabilished on brown soil. The experiment included the following treatments: 1 – soil + sewage sludge from dairy, 2 – soil + sewage sludge from dairy + farmyard manure (FYM), K – soil control, no sludge. Sewage sludge was applied at the rate 22 t ha-1 yr-1 and FYM at the rate 20 t ha-1 yr-1. It was found out that the effect of sewage sludge from dairy on the number of nitrifying bacteria was stimulated. Sewage sludge did not influence the number of ammonifying bacteria. Fertilization of sewage sludge increased amonification rates and inhibited the nitrification process.

The experiment was set on lessive soil developed from heavy loamy sand. The aim of the study was to evaluate the effect of 250 kg S ha-1 year-1 dose on intensification of respiration activity, intensification of amonification and nitrification processes. The soil was amended with liquid manure (120 m3 ha-1 year-1) before acidic rainfall dose application. Soil sulphating stimulated the amonification process. Nitrification process was stimulated by liquid manure but inhibited by sulphating.