Biomass wastes from supercrit. gas extn. of alfalfa and goldenrod were impregnated with Cu, Zn or Mn sulfates(VI) (enrichment factors 47-3705) and used as microelement fertilizers in lab. germination tests on cucmber culture (transfer factors 7.8-90.7). The addn. of micrielements had not any significant effect on the results of germination tests (except for ay. stalk length which increased after addn. of microelement fertilizers).