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TECHNICAL REPORTS

Waste Management

Hybrid Poplar and Forest Soil Response to Municipal and Industrial By-Products

A Greenhouse Study

^a Department of Forest, Rangeland, and Watershed Stewardship, Colorado State University, Fort Collins, CO 80523
^b Department of Forest Resources, University of Minnesota, North Central Research and Outreach Center, 1861 Highway 169 East, Grand Rapids, MN 55744-3396
^c Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Marianna, AR 72360
^d Department of Soil, Water, and Climate, University of Minnesota, 439 Borlaug Hall, 1991 Upper Buford Circle, St. Paul, MN 55108

^* Corresponding author (dgilmore{at}umn.edu).

Received for publication December 16, 2002. Little research has been conducted in the Lake States (Minnesota, Wisconsin, and Michigan) to evaluate the effects of municipal and industrial by-product applications on the early growth of short rotation woody crops such as hybrid poplar. Anticipated shortages of harvestable-age aspen in the next decade can be alleviated and rural development can be enhanced through the application of by-products to forest soils. This study was conducted to evaluate the effects of inorganic fertilizer, boiler ash, biosolids, and the co-application of ash and biosolids application on tree growth and soil properties by measuring hybrid poplar clone NM-6 (Populus nigra L. x P. maximowiczii A. Henry) yield, nutrient uptake, and select post-harvest soil properties after 15 wk of greenhouse growth. Treatments included a control of no amendment; agricultural lime; inorganic N, P, and K; three types of boiler ash; biosolids application rates equivalent to 70, 140, 210, and 280 kg available N ha^–1; and boiler ash co-applied with biosolids. All of the by-products treatments showed biomass production that was equal to or greater than inorganic fertilizer and lime treatments. A trend of increased biomass with increasing rates of biosolids was observed. Soil P concentration increased with increasing rates of biosolids application. None of the by-products treatments resulted in plant tissue metal concentrations greater than metal concentrations of plant tissue amended with inorganic amendments. Biosolids, boiler ash, and the co-application of biosolids and boiler ash together on forest soils were as beneficial to plant growth as inorganic fertilizers.

Abbreviations: ENP, effective neutralizing power

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This Issue in Journal of Environmental Quality

JEQ 2004 33: 799-804. [Full Text]