Changes

:Testing soil organic matter by LOI method involves drying a sample, typically at 105 to 120 ◦C for 2 hours, measuring the dry weight, igniting and ashing the dry sample, typically at between 360 to 425 ◦C for 10 to 16 hours <ref name=OMAFRA/><ref>McLachlin, I. 2016. Personal communication with Young,D. June 29, 2016.</ref><ref>Wright, T. 2016, Personal communication with Young, D. June 28, 2016.</ref> in a muffle furnace and then reweighing the sample to determine the change in weight. The weight loss value (i.e., LOI value) is then used to calculate the organic matter content value based on the relationship between LOI and soil organic carbon established for the region through extensive testing of soil samples by the Walkley-Black method, with results reported as percent organic matter (%OM) by dry sample weight.

:Testing soil organic matter by LOI method involves drying a sample, typically at 105 to 120 ◦C for 2 hours, measuring the dry weight, igniting and ashing the dry sample, typically at between 360 to 425 ◦C for 10 to 16 hours <ref name=OMAFRA/><ref>McLachlin, I. 2016. Personal communication with Young,D. June 29, 2016.</ref><ref>Wright, T. 2016, Personal communication with Young, D. June 28, 2016.</ref> in a muffle furnace and then reweighing the sample to determine the change in weight. The weight loss value (i.e., LOI value) is then used to calculate the organic matter content value based on the relationship between LOI and soil organic carbon established for the region through extensive testing of soil samples by the Walkley-Black method, with results reported as percent organic matter (%OM) by dry sample weight.

   

   

Acceptable procedures for testing organic matter content of soils by both the Walkley-Black method and LOI method are provided by North Central Regional Research Publication No. 221 <ref>Combs, S.M. and Nathan,M.V. 2012. “Soil Organic Matter.” In Recommended Chemical Soil Test Procedures for the North Central Region. North Central Regional Research Publication No. 221. Missouri Agricultural Experimental Station.</ref>. Acceptable procedures for testing organic matter content of [[compost]] or highly organic soils is provided by [https://www.astm.org/Standards/D2974.htm ASTM D2974-14, Standard Test Methods for Moisture, Ash, and Organic Matter of Peat and Other Organic Soils] and United States Department of Agriculture<ref>United States Department of Agriculture (USDA). 2002. 05.07A Test Methods for the Examination of

Acceptable procedures for testing organic matter content of [[Soil groups|soils]] by both the [https://anlab.ucdavis.edu/analysis/Soils/410#:~:text=This%20method%20quantifies%20the%20amount,organic%20matter%20containing%2058%25%20carbon. Walkley-Black method] and [https://anlab.ucdavis.edu/analysis/Soils/415#:~:text=PHYSIO%20CHEM%3A%20OM%20(LOI),C%20(LOI)&text=This%20method%20estimates%20soil%20organic,for%202%20hours%20at%20360%C2%BAC. Loss on Ignition (LOI method)] are provided by:

Composts and Composting. Holbrook, NY: Composting Council Research and Education Foundation</ref>.

*[https://www.naptprogram.org/files/napt/north-central-states-methods-manual-2012.pdf North Central Regional Research Publication No. 221 <ref>Combs, S.M. and Nathan,M.V. 2012. “Soil Organic Matter.” In Recommended Chemical Soil Test Procedures for the North Central Region. North Central Regional Research Publication No. 221. Missouri Agricultural Experimental Station.</ref>].  

 

Acceptable procedures for testing organic matter content of [[compost]] or highly organic soils is provided by:

*[https://www.astm.org/Standards/D2974.htm ASTM D2974-14, Standard Test Methods for Moisture, Ash, and Organic Matter of Peat and Other Organic Soils and United States Department of Agriculture]<ref>United States Department of Agriculture (USDA). 2002. 05.07A Test Methods for the Examination of Composts and Composting. Holbrook, NY: Composting Council Research and Education Foundation</ref>.

==Evaluation==

==Evaluation==