The ??Loss on Ignition?? method for the determination of organic content is most applicable to those materials identified as peats@ organic mucks@ and soils containing relatively undecayed or undecomposed vegetative matter or fresh plant materials such as wood@ roots@ grass@ or carbonaceous materials such as lignite@ coal@ etc. This method determines the quantitative oxidation of organic matter in these materials and gives a valid estimate of organic content. The ??Wet Combustion?? (T 194) method is recommended when it is desired to determine the humuslike easily oxidized organic material to provide information relating to the suitability of a soil for plant growth.The following applies to all specified limits in this standard: For the purposes of determining conformance with these specifications@ an observed value or a calculated value shall be rounded off ??to the nearest unit?? in the last right-hand place of figures used in expressing the limiting value@ in accordance with R 11.The values stated in SI units are to be regarded as the standard.