Polyoxometalates of Keggin Type with Mixed Addenda Used as Fertilizers for Triticale Seeds

In this paper, we propose to follow the influence of the monolacunary Keggin polyoxoanion K-8[PVW10O39] and its complexes with transition metals: K-x[MPVW1O39(H2O)] (x = 6 for M = Mn(II), Cu(II), Co(II), Ni(II) and x = 5 for M = Fe(III)) in the germination of the Triticale seeds. The Triticale seeds were treated with solutions of each species in concentrations from 0.1 to 100 ppm, and the measured parameters have been reported to seeds treated with distilled water as control. Parameters followed along our studies were: the efficiency of the germination, the length of the radicles and seminal roots, the length of the coleoptile and the first foliage leaf, the biomass yield. Mn(II), Co(II), Ni(II) and Fe (III) compounds stimulated growth of radicles and seminal roots, especially at lower concentrations. The Cu(II) complex inhibited generally the growth of all anatomical parameters, but the biomass increase was stimulated especially in treatment with 1.0 ppm solution. The monolacunary polyoxoanion, K-8[PVW10O39], was the best fertilizer of the studied species due to its ability to act as a polydentat ligand for transition metal cations. Its action on germination and growth seedlings was better than for its coordinated compounds with cations. Concentrations of transition metal cations were measured for seedlings by the germination of Triticale seeds and it was seen that these were accumulated in plants. The cations accumulation in plants increased in the same time with the concentration of Kx[MPVW10O39(H2O)] solutions.