DIN EN ISO 14240-1:2011-09

This part of ISO 14240 specifies a method for estimating the active aerobic, heterotrophic microbial biomass in aerated agricultural and mineral soils. Determination of the effects of chemicals on biomass is outside the scope of this part of ISO 14240. Soil consists of both living and nonliving components which exist in a complex and heterogeneous environment. Soil microflora is responsible for the degradation of organic matter, stability of aggregates and most nutrient cycling which occurs in soils. The purpose of determining the microbial biomass of soils is to allow assessment of the continued maintenance of soil fertility, the potential ability to degrade added organic materials, and the effects of added materials on the natural microbial population. The ISO 14240 series consists of the following parts, under the general title "Soil quality - Determination of soil microbial biomass": - Part 1: Substrate- induced respiration method - Part 2: Fumigation-extraction method Expert assistance and specialized laboratories will be required to perform the procedure described in this standard. The text of ISO 14240-1:1997 has been prepared by Technical Committee ISO/TC 190 "Soil quality" of the International Organization of standardization (ISO) and has been adopted as EN ISO 14240-1:2011 by Technical Committee CEN/TC 345 "Characterization of soils", the secretariat of which is held by NEN. The text of ISO 14240-1:1997 has been approved by CEN as EN ISO 14240-1:2011 without any alterations. The Committee responsible for this standard is NA 119-01-02-04 UA "Biologische Verfahren" ("Biological Methods") at DIN.