USDA Forest Service research finds positive results from biosolids fertilizer

The time-of-flight (TOF) acoustic wave method employed by USDA Forest Service, Forest Products Laboratory, finds biosolids fertilization treatment “had a statistically significant effect on acoustic velocities measured in standing trees, stems, and butt logs.”

See the attached recent report, “Acoustic Evaluation of Thinning and Biosolid Fertilization Effects on Wood Quality of a Douglas-fir Stand.”  USDA Forest Service-FPL-GTR-239