PT  - JOURNAL ARTICLE
AU  - E. Thomas Smiley
AU  - Gary W. Watson
AU  - Bruce R. Fraedrich
AU  - Donald C. Booth
TI  - Evaluation of Soil Aeration Equipment
AID  - 10.48044/jauf.1990.031
DP  - 1990 May 01
TA  - Arboriculture & Urban Forestry (AUF)
PG  - 118--123
VI  - 16
IP  - 5
4099  - http://auf.isa-arbor.com/content/16/5/118.short
4100  - http://auf.isa-arbor.com/content/16/5/118.full
SO  - JOA1990 May 01; 16
AB  - Soil compaction is a widespread problem limiting tree growth in urban areas. The Grow Gun and Terralift were developed to reduce soil compaction. Operationally both machines had advantages and disadvantages. In the soil, both machines created saucer shaped fractures. The area of Terralift fractures were two to four times larger than that of Grow Gun. Oxygen diffusion was improved only at the fracture line. Neither machine reduced soil bulk density.