The methods for estimating Fe, Mn and Zn solubility in smonitzas over Serbia (ten localities) used as fields and meadows, were studied in this paper. The total contents of these elements were found to be nearly equal to their mean values in the world soils. Regarding their availability, investigated smonitzas were found to be well supplied with manganese and, for the majority of samples, with iron. But, deficiency of iron in the soil were found in 25% and zinc in 65% of analyzed samples, after a more sensitive DTPA method had been used. A certain number of positive or negative correlations between the total and the available contents of the elements studied and some basic properties of the smonitzas were obtained, which is in agreement with the behavior of these elements in the soil.