Laboratory Methods for Soil Health Analysis, Volume 2. Группа авторов

Assay incubation followed by colorimetric measurement Tabatabai, 1994 N‐acetyl‐B‐D‐glucosaminidase Assay incubation followed by colorimetric measurement Deng and Popova, 2011 Phosphomonoesterase Assay incubation followed by colorimetric measurement Acosta‐Martínez and Tabatabai, 2011 Arylsulfatase Assay incubation followed by colorimetric measurement Klose et al., 2011 Phospholipid Fatty Acid (PLFA) Bligh‐Dyer extractant, solid phase extraction, transesterification; gas chromatography Buyer and Sasser, 2012 Genomics 18S, 16S or ITS analysis or a combination of 16S and 18S/ITS and/or shotgun metagenomics Earth Microbiome Project 500; Marotz et al., 2017 Thompson et al., 2017 Reflectance Diffuse reflectance spectroscopy Veum et al., 2015

Several layers of certifications or validations may be in place to ensure data quality for commercial analytical labs. For example, the Agricultural Laboratory Proficiency (ALP) Program provides soil samples to laboratories for analysis and then assesses that laboratory’s results relative to the test soil’s known properties. In turn, the ALP program is accredited by the American National Standards Institute/American Society of Quality Control National Accrediting Board (ANAB) through testing of ISO/IEC 17043, itself an international standard of the International Organization for Standardization and the International Electrotechnical Commission for laboratory proficiency testing that determines the performance of individual laboratories for specific tests or measurements and is used to monitor laboratories’ continuing performance through interlaboratory comparisons. Thus, commercial laboratories conducting analyses for soil health indicators select measurements and indicators that are understood in the research community to relate to processes in soil important to soil health; and methods that are affordable to the farming community, as well as verifiable for accuracy and precision (= reliability to the producer) by independent tests.

Summary and Conclusions

      This introduction to Volume II provides those interested in soil health assessment methods a brief background regarding identification and selection of the indicators within this volume and to provide context regarding current and future soil health assessment efforts. It also demonstrates that multiple groups (i.e., SHI and the NRCS‐SHD) that engaged in workshops and conferences during 2013 to 2015 continue to coordinate soil health assessments to protect and enhance our fragile, yet life‐sustaining soil resource for current and future generations.

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