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Soil Moist Management
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™ Without Mycorrhiza
The eight different mulch treatments were replicated three times and randomly positioned within the plot layout on May 28, 2008. After being exposed to the elements for over 21 the mulch treatments were ignited on August 14, 2008.
⁄2 With Mycorrhiza
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months,
Based on cumulative values for the three combus- tion characteristics, shredded rubber, pine needles and shredded western red cedar demonstrated the most hazardous fire behavior. Composted wood chips and Tahoe chips (wood chips mixed with needles and bark) demonstrated the least hazard- ous fire behavior based on the factors measured in this evaluation.
Shredded rubber mulch burned at the hottest aver- age maximum temperature (in excess of 630° F/332° C measured at 4 inches (10 cm) above the mulch bed) and produced the greatest flame heights which averaged over 3 feet (.91 m). It ignited easily and burned intensely for a prolonged period. Pine needles were second only to shredded rubber mulch in terms of the cumulative value of combustion characteristics.
The full eight-page, color document can be viewed in its entirety at www.unce.unr.edu/publications/files/nr/2011/ sp1104.pdf. The document includes specific recommen- dations for mulch use based on the study's findings. There is also a YouTube video about the study, found at: http://www.youtube.com/watch?v=Y1QokHypUTs.
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