【求助】(已应助)有机质、腐殖质、腐殖酸的区别及检测方法。

The term humus is used by some soil scientists synonymously with soil organic matter, that is to denote all organic material in the soil, including humic substances. Contemporary, the term humus is frequently used to represent only the humic substances.。
Humic acid is one of the major components of humic substances (or Natural Organic Matter (NOM)) which are dark brown and major constituents of soil organic matter humus that contributes to soil chemical and physical quality and are also precursors of some fossil fuels. They can also be found in peat, coal, many upland streams and ocean water.
Humus：Nonliving, finely divided organic matter in soil, derived from microbial decomposition of plant and animal substances. Ranging in colour from brown to black, it consists primarily of carbon but also contains nitrogen and smaller amounts of phosphorus and sulfur. As it decomposes, its components are changed into forms usable by plants. Humus is classified according to how well it is incorporated into the mineral soil, the types of organisms involved in its decomposition, and the vegetation from which it is derived. It is valued by farmers and gardeners because it provides nutrients essential for plant growth, increases the soil's water absorption, and improves soil workability.
从这些英文定义上来看，这三种名字所包含的物质从某种意义上讲是相同的。
不好意思，没有找到中文的定义

对于这个问题其实目前有很多迷惑!在肥料的使用中,很多人都分不清楚这三种物质的本质区别或者说是相同之处,以至于在检测的时候不方便,还请高人能够指点!