Long term light-weight aggregate performance as soil amendments

"This research presents results from a 22-year investigation involving several light-weight aggregates and their ability to resist compaction (lower the bulk density) resulting in a more porous soil system." (p.149) [UMN]

"Compaction of soil as a result of visitor and equipment use of a site is a serious impediment to plant health. It can significantly alter the ability of plants to extend roots through the soil for structural support, uptake of essential nutrients, and water. This research presents results from a 22-year investigation involving several light weight aggregates and their ability to resist compaction (lower the bulk density) resulting in a more porous soil system. At the end of the 22-year study period at the Hains Point site (silt loam soil), the bulk density of light weight aggregate treated plots was significantly lower ate 1.3 Mg/m-3 when compared to the control of 1.47 Mg/m-3. The total pore space for the same study and treatments was significantly higher, 51.03%, compared to the control 44.48%. The same trends were realized on a fine sandy loam soil over a 21-year study period. Aggregates were incorporated at the onset of the study with only normal mowing operations occurring during the testing period while public use of the sites continued." [Abstract]

[Morton Arboretum, Sept. 30-Oct. 1, 1993]

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