Changes

==Testing==

==Testing==

A commonly used laboratory test method is to saturate a sample of the soil with a known quantity of cations and measure the amount retained by the soil. An acceptable test method is provided in ASTM D7503-10 Standard Test Method for Measuring the Exchange Complex and Cation Exchange Capacity of Inorganic Fine-Grained Soils [https://www.astm.org/Standards/D7503.htm]. Descriptions of acceptable laboratory equipment for measuring CEC are described in the Soil Fertility Handbook <ref>Ontario Ministry of Agriculture F and RA. Soil Fertility Handbook. (Reid K, ed.). OMAFRA; 2006. http://www.omafra.gov.on.ca/english/crops/pub611/pub611.pdf. Accessed October 17, 2017.</ref>.

A commonly used laboratory test method is to saturate a sample of the soil with a known quantity of cations and measure the amount retained by the soil. An acceptable test method is provided in [https://www.astm.org/Standards/D7503.htm ASTM D7503-10 Standard Test Method for Measuring the Exchange Complex and Cation Exchange Capacity of Inorganic Fine-Grained Soils]. Descriptions of acceptable laboratory equipment for measuring CEC are described in the Soil Fertility Handbook <ref>Ontario Ministry of Agriculture F and RA. Soil Fertility Handbook. (Reid K, ed.). OMAFRA; 2006. http://www.omafra.gov.on.ca/english/crops/pub611/pub611.pdf. Accessed October 17, 2017.</ref>.

==Evaluation==

==Evaluation==