According to the result of the observations on the effect of the reagents, $CuSO_4{cdot}5H_2O$, $ZnSO_4{cdot}7H_2O$ $MnSO_4{cdot}4H_2O$, $HgCl_2$, upon the mycelial growth of psalliota campestris $HgCl_2$ showed the strongest effect on checking the mycelial growth $(,.008{sim}0.01%)$ $CuSO_4{cdot}5H_2O(0.030%)$, $ZnSO_4{cdot}7H_2O(0.080%)$, came next and the $MnSO_4{cdot}4H_2O(0.100%)$ was the weakest. Writer also found that showed the promoting effect of the mycelial growth in appropriate Concentration (at $0.015%;CuSO_4{cdot}5H_2O$, $0.030%ZnSO_4{cdot}7H_2O$).