Abstract. Incubation and pot experiments were carried out on muddy fine sand and fine sand soils to determine the efficiency of dolomitic limestone and of industrial by-products, basic slag and peat ash, as liming agents. Calcitic limestone was used as reference material. In the incubation experiment 0, 0.6, 1.2 and 2,4 g calcitic limestone were applied to 390 g (muddy fine sand) or 360 g (fine sand) of air-dry soil. The amount of other liming agents added was 2.4 g. In the pot experiment the weights of soil were 3.9 kg (muddy fine sand) and 3.6 kg (fine sand) and 24 g of liming agent was applied. The