The aim of effected research was to appoint the possibility of manufacturing-in the polycondensation process of potassium and sodium phosphates at the temperature 400 degrees C-of solid, neutral pyro- or tripolyphosphate complexes of micronutrients, as (K,Na)(4n-2)Me(P2O7)(n) and (K,Na)(5n-2)Me(P3O10)(n), where Me2+ means Cu2+, Zn2+, Mn2+, or Co2+. The influence of substrates mixture composition and of the mole ratio P2O74-/Me2+ or P3O105-/Me2+ on the properties of obtained products was defined. The condensed phosphates, which were manufactured, were typified by-differentiated water solubility with reference to P2O5, K2O Na2O, and Me2+ alike. The presence of assumed complex compounds in the manufactured condensed phosphates was not confirmed by means of X-ray diffraction analysis, because of the existence of different crystalline phases oil the one hand and lack of suitable standard substances on the other, and also because of the possibility of their occurrence in amorphous form. Only in the case of the pyrophosphate complex with zinc, the existence of the phase, corresponding to K6Zn(P2O7)(2) was found, and in the case with copper, the possibility of the occurrence of K6Cu(P2O7)(2) was suggested. Therefore, for manufacturing of liquid fertilizers, the more suitable solution will be the complexing of micronutrients in water solution, with the utilization of alkali metals pyre-or tripolyphosphates, previously obtained in the condensation process.