Wood Ash: An Alternative Liming Material for Agricultural Soils
Alberta Agriculture and Rural Development

Many forestry facilities in Alberta use bark, sawdust and yard waste, commonly referred to as "hog fuel," to generate steam, electricity and heat for plant operations. There are also several facilities that use hog fuel as an energy source to generate electricity. More than 180,000 tonnes of energy system wood ash produced annually at pulp mills, sawmills, oriented strand board and fibre board plants is currently disposed of in industrial or regional landfills.

See: http://www1.agric.gov.ab.ca/$Department/deptdocs.nsf/all/agdex3435
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