Guidelines for Specifications of Biochars for Use in Soils FINAL ...
Guidelines for Specifications of Biochars for Use in Soils FINAL ...
Guidelines for Specifications of Biochars for Use in Soils FINAL ...
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12Figure 1. Biochar Test Categories – Requirements based on feedstock type.3456789101112131415161718192021222324252627284.1 Test Category A – Basic Utility PropertiesAll biochar must be tested <strong>for</strong> basic utility properties and meet the criteria specified under TestCategory A, as shown <strong>in</strong> Table 1 below. Basic biochar characteristics <strong>in</strong>clude the physicalproperties <strong>of</strong> particle size and moisture, as well as the chemical properties <strong>of</strong> elementalproportions [Hydrogen (H), Carbon (C), and Nitrogen (N)], ash proportion, and pH/lim<strong>in</strong>gability. Organic carbon content (C org ) is used to assign the biochar material to a Class that isdependent on the percentage <strong>of</strong> C org <strong>in</strong> the material. Carbon stability is <strong>in</strong>dicated by the molarratio <strong>of</strong> hydrogen to organic carbon. Lower values <strong>of</strong> this ratio are correlated with greatercarbon stability. See Appendix 5, The <strong>Use</strong> <strong>of</strong> H:C org to Indicate C Stability, <strong>for</strong> more <strong>in</strong><strong>for</strong>mationon this analysis.29International Biochar Initiative – <strong>Guidel<strong>in</strong>es</strong> <strong>for</strong> <strong>Specifications</strong> <strong>of</strong> <strong>Biochars</strong> <strong>for</strong> <strong>Use</strong> <strong>in</strong> <strong>Soils</strong> 12
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