Skip to main content

Resource Catalog


Type: Journal Article
Author(s): Dana Mitchell; Tom Gallagher
Publication Date: 2007

ANNOTATION: This time and motion study determines the productivity and costs of an in-woods chipping operation to create biomass fuel from processing whole small-diameter trees. It was found that the cost of biomass chipping was comparable to other existing treatments such as cut-and-pile or mulching. Two different overstocked stands were studied with the same harvesting and chipping method. ABSTRACT: A time and motion study was conducted to determine the productivity and cost of an in-woods chipping operation when processing whole mall-diameter trees for biomass. The study removed biomass from two overstocked stands and compared the cost of this treatment to existing alternatives. The treatment stands consisted of a 30-year-old longleaf pine stand and a 37-year-old loblolly pine stand. In the longleaf pine stand, 71% of the trees removed were less than 5 in. dbh. In the loblolly pine stand, approximately 81% of the stems removed were less than 5 in. dbh. The harvesting system consisted of conventional ground-based harvesting equipment and a three-knife chipper that processed the biomass into fuel chips. The average production time to fill a chip von was 24.61 minutes. The chip moisture content averaged 94.1 1% (dry basis). Using machine rates and federal labor wage rates, the in-woods cost of producing fuel chips was $9.1 8/green ton (gt). The cost of the biomass chipping operation ($1 5.1 8/91), including transportation, compared favorably to existing alternative treatments of cut-and-pile or mulching.

Online Links
Citation: Mitchell, Dana; Gallagher, Tom. 2007. Chipping whole trees for fuel chips: a production study. Southern Journal of Applied Forestry 31(4):176-180.

Cataloging Information

Partner Sites:
  • Alabama
  • biomass
  • harvesting
  • hogfuel
  • production
Record Last Modified:
Record Maintained By: FRAMES Staff (
FRAMES Record Number: 7675