A COMPARISON OF VARIABLE ECONOMIC COSTS ASSOCIATED WITH TWO PROPOSED BIOCHAR APPLICATION METHODS

The addition of biochar to agricultural soils has been shown to improve crop productivity and sequester carbon in soils over a millennial timeline. However, little formal research has assessed the logistics or economics of transitioning to a biochar economy. This paper examines the problem of biochar application to soil. Specifically, we look at two methods of application-broadcast-and-disk and trench-and-fill and provide cost estimates for each under varying rates of saturation. Our findings show that the broadcast process is generally cheaper; however, we consider a trench-and-fill method to be more suitable for storing large quantities of biochar in soil. For broadcast application, we found that at saturation rates of 2.5, 5, 10, 25, and 50 tons per acre, a respective cost per acre is $29, $44, $72, $158, and $300. Our examination of the trench-and-fill process revealed that cost depended on several variables, including saturation rate, trench depth, and operator efficiency. We found that at saturation rates of 5, 10, 25, 50, and 75 tons per acre, with trenches 2 feet deep, and at trenching and application rates of 15 feet per minute, a respective cost per acre of applied biochar is $34, $85, $171, $341, and $512. In both methods, we found results that suggest biochar application could constitute a considerable cost, many times greater than typical agricultural processes. Although our findings offer only a basic guide to calculating the cost of application, the intent of this paper is to serve as a launching pad for the much-needed additional research into the costs and other potential constraints of biochar application to agricultural soils. Permanent URL: http://hdl.handle.net/2047/d20000350

[1]  John Gaunt,et al.  Bio-char Sequestration in Terrestrial Ecosystems – A Review , 2006 .

[2]  P. Blackwell,et al.  Biochar Application to Soil , 2012 .

[3]  M. Ahmedna,et al.  CHARACTERIZATION OF DESIGNER BIOCHAR PRODUCED AT DIFFERENT TEMPERATURES AND THEIR EFFECTS ON A LOAMY SAND , 2009 .

[4]  David A. Laird,et al.  The Charcoal Vision : A Win – Win – Win Scenario for Simultaneously Producing Bioenergy , Permanently Sequestering Carbon , while Improving Soil and Water Quality , 2008 .

[5]  William M. Edwards,et al.  Iowa Farm Custom Rate Survey , 2011 .

[6]  J. Lehmann,et al.  Bio-char soil management on highly weathered soils in the humid tropics , 2006 .

[7]  Dominic Woolf.  Biochar as a Soil Amendment: A Review of the Environmental Implications , 2008 .

[8]  Matthias C. Rillig,et al.  Mycorrhizal responses to biochar in soil – concepts and mechanisms , 2007, Plant and Soil.

[9]  J. Lehmann.  Bio-energy in the black , 2007 .

[10]  D. Laird,et al.  Stability of Biochar in the Soil , 2009 .

[11]  Brent A. Gloy,et al.  Life cycle assessment of biochar systems: estimating the energetic, economic, and climate change potential. , 2010, Environmental science & technology.

[12]  K. Das,et al.  Potential for Pyrolysis Char to Affect Soil Moisture and Nutrient Status of a Loamy Sand Soil , 2007 .

[13]  J. Novak,et al.  Term Conservation and Disk Tillage Management in a Norfolk Loamy Sand , 2007 .

[14]  Johannes Lehmann,et al.  Biological nitrogen fixation by common beans (Phaseolus vulgaris L.) increases with bio-char additions , 2007, Biology and Fertility of Soils.

[15]  B. McCarl,et al.  Biochar for Environmental Management , 2009 .

[16]  G. Marland,et al.  A synthesis of carbon sequestration, carbon emissions, and net carbon flux in agriculture: comparing tillage practices in the United States , 2002 .