Determination method of soil organic nitrogen

Determination method of soil organic nitrogen, Total:221 items.

The international standard classification for "Determination method of soil organic nitrogen" includes: Farming and forestry , Soil quality and pedology in general , Soil quality. Pedology , Other standards related to soils quality .

The Chinese standard classification for "Determination method of soil organic nitrogen" includes: Soil and fertilizer in general , Water and soil conservation , Basic standards and general methods , Analysis methods for environmental quality of soils .

Xinjiang Provincial Standard of the People's Republic of China

DB65/T 602.9-2001 The determinanation of unit weight in soil
DB65/T 4631.2-2023 Soil testing methods - Determination of available elements - Part 2: Determination of hydrolyzable nitrogen content
DB65/T 602.3-2001 The determinanation of ammonium nitrogen in soil
DB65/T 602.10-2001 The determinanation of soil particle siensite in soil
DB65/T 602.13-2001 The determinanation of available zinc、manganese、copper and iron in soil
DB65/T 602.2-2001 The determinanation of hydrolyzable nitrogen in soil
DB65/T 602.4-2001 The determinanation of nitrate nitrogen in soil
DB65/T 602.7-2001 The determinanation of PH value in soil
DB65/T 4631.4-2023 Soil testing methods - Determination of available elements - Part 4: Determination of available boron content
DB65/T 4631.5-2023 Soil testing methods - Determination of available elements - Part 5: Determination of available molybdenum content
DB65/T 602.5-2001 The determinanation of available phosphous in soil
DB65/T 4631.8-2023 Soil testing methods - Determination of available elements - Part 8: Determination of available sulfur content

Professional Standard - Forestry

LY/T 1230-1999 Determination of nitrate nitrogen in forest soil
LY/T 1237-1999 Determination of organic matter in forest soil and calculation carbon-nitrogen ratio
LY/T 1228-1999 Determination of total nitrogen in forest soil
LY/T 1228-2015 Nitrogen determination methods of forest soils
LY/T 1231-1999 Determination of ammonium nitrogen in forest soil
LY/T 1229-1999 Determination of hydrolyzable nitrogen in forest soil

Professional Standard - Agriculture

NY/T 1848-2010 Method for determination of ammonium nitrogen,available phosphorus and rapidly-available potassium in neutrality or calcareous soil—Universal extract-colorimetric method
NY/T 1121.7-2014 Soil Testing－Part7:Method for determination of avalible phosphorus in soil
NY/T 1121.8-2006 Soil Testing Part 8:Method for determination of soil avalible boron
NY/T 1121.9-2023 Soil testing-Part 9: Method for determination of soil available molybdenum
NY/T 1121.9-2006 Soil TestingPart 9: Method for determination of soil avalible molybdenum
NY/T 1121.14-2006 Soil Testing - Part 14: Method for Determination of Soil Avalible Sulphur
NY/T 53-1987 Method for the determination of soil total nitrogen(Semi-micro Kjeldahl method)
NY/T 1121.14-2023 Soil testing-Part 14: Method for determination of soil available sulphur
NY/T 1121.15-2006 Soil Testing - Part 15: Method for Determination of Soil Available Silicon
NY/T 149-1990 Method for the determination of available boron in soil
NY/T 1849-2010 Method for determination of ammonium nitrogen,available phosphorus and rapidly-available potassium in acid soil—Universal extract-colorimetric method
NY/T 4606-2025 Determination of Total Carbon and Organic Matter in Soil by Elemental Analyzer Method
NY/T 1121.24-2012 Soil Testing - Part 24: Determination of Total Nitrogen in Soil - Automatic Kjeldahl Apparatus Method
NY/T 148-1990 Method for the determination of available boron in soil
NY/T 1121.6-2006 Soil Testing - Part 6: Method for Determination of Soil Organic Matter
NY/T 85-1988 Method for determination of soil organic matter
NY/T 1121.9-2012 Soil Testing Part9:Method for determination of soil avalible molybdenum

General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China

GB 12297-1990 Method for the determination of available phosphorus in calcareous soil
GB 7173-1987 Method for the determination of soil total nitrogen (semi-micro Kjeldahl method)
GB 9834-1988 Method for determination of soil organic matter
GB/T 42488-2023 Soil quality—Determination of nitrogen-15 abundance of inorganic nitrogen in soil—Stable isotope ratio mass spectrometry
GB/T 32737-2016 Determination of nitrate nitrogen in soil—Ultraviolet spectrophotometry method
GB 12298-1990 Method for the determination of available boron in soil
GB/T 42487-2023 Soil quality—Determination of nitrate, nitrite and ammonium in soils—Extraction with potassium chloride solution and determination using automated method with segmented flow analysis
GB/T 42490-2023 Soil quality—Determination of total content and isotope ratio of organic carbon and nitrogen of soil and biological samples—Stable isotope ratio mass spectrometry
GB/T 44741-2024 Determination methods of soil bioavailable arsenic at the origin of agricultural products
GB/T 42485-2023 Soil quality—Determination of nitrate, nitrite and ammonium in soils—Extraction with potassium chloride solution and determination with manual method

Tianjin Provincial Standard of the People's Republic of China

DB12/T 961-2020 Determination of organic matter content in soil direct heating method
DB12/T 1270-2023 Determination of cracked nitrogen in soil
DB12/T 512-2014 Determination method of nitrate nitrogen in soil samples

Ningxia Provincial Standard of the People's Republic of China

DB64/T 1734-2020 Soil Hydrolyzable Nitrogen Determination Kjeldahl Method

Professional Standard - Environmental Protection

HJ 658-2013 Soil - Determination of organic carbon – Combustion oxidation- titration method
HJ 695-2014 Soil - Determination of organic carbon - Combustion oxidation nondispersive infrared absorption method
HJ 717-2014 Soil quality - Determination of total nitrogen - Modified Kjeldahl method

Sichuan Provincial Standard of the People's Republic of China

DB51/T 1875-2014 Determination of soil alkaline nitrogen

Shandong Provincial Standard of the People's Republic of China

DB37/T 1897-2011 Determination of Soil Nitrate Nitrogen by Ion Chromatography

Hebei Provincial Standard of the People's Republic of China

DB13/T 843-2007 Soil Available Nitrogen Determination
DB13/T 1224-2010 Determination method of total nitrogen in organic chemical products

Group Standards of the People's Republic of China

T/SDAS 304-2021 Soil Hydrolyzable Nitrogen Determination Automatic Distillation Potentiometric Titration
T/CRRA 9925-2025 Soil carbon sequestration accounting method Organic carbon
T/NAIA 009-2020 Determination of soil microbial biomass nitrogen
T/SXSYSJSXH 0001-2024 Determination of soil available mercury
T/SDAS 921-2024 Soil carbon pool accounting - Determination of organic carbon in saline-alkali soils - Chloride ion subtraction-titration method

Hubei Provincial Standard of the People's Republic of China

DB42/T 1086-2015 Spectrophotometric method for the determination of forest soil organic matter

Jilin Provincial Standard of the People's Republic of China

DB22/T 2270-2015 Determination of Ammonium Nitrogen and Nitrate Nitrogen in Farmland Soil by Flow Injection Analysis
DB22/T 2245-2015 Determination method for assessing degree of humification of peat and organic soils
DB22/T 2270-2018 Determination of Ammonium Nitrogen and Nitrate Nitrogen in Farmland Soil by Flow Injection Analysis

Shanxi Provincial Standard of the People's Republic of China

DB14/T 1099-2015 Determination of Hydrolyzable Nitrogen in Soil Alkaline Hydrolysis Distillation Potentiometric Titration

Gosstandart of Russia

GOST R 58596-2019 Soils. Methods for determination of total nitrogen
GOST 27753.8-1988 Greenhouse grounds method for determination of ammonium nitrogen
GOST 27753.10-1988 Greenhouse grounds method for determination of organic matter
GOST 27753.7-1988 Greenhouse grounds methods for determination of nitrate nitrogen
GOST 23740-1979 Soils. Methods of laboratory determination of organic composition
GOST 26107-1984 Soils. Methods for determination of total nitrogen
GOST 23740-2016 Soils. Methods of laboratory determination of organic composition
GOST 26262-2014 Soils. Soils field methods for determining depth of thawing
GOST 27784-1988 Soils. Method for determination of ash content in peat and peat-containing soil horizonts
GOST R 71044-2023 Soils. Methods for determining the solubility of soils in water

Austrian Standards

ONORM L 1091-1999 Chemical analysis of soils - Determination of inorganic nitrogen Nmin-method
ONORM L 1082-1999 Chemical analyses of soils - Determination of nitrogen according to Kjeldahl
ONORM L 1079-1999 Chemical analyses of soils - Determination of soil organic matter by loss on ignition
ONORM L 1080-1999 Chemical analyses of soils - Determination of organic carbon by dry combustion
ONORM L 1081-1999 Chemical analyses of soils - Determination of organic carbon by wet combustion

COMMISSION FOR THE STANDARDS, METROLOGY AND QUALITY OF VIETNAM (STAMEQ)

TCVN 4050-1985 Soil.Method for the determination of total organic matter
TCVN 5255-2009 Soil quality.Method for the determination of bio-available nitrogen
TCVN 4053-1985 Soil.Method for the determination of total potassium

Standard Association of Australia （SAA）

AS 1289.4.1.1:2019 Methods of testing soils for engineering purposes, Method 4.1.1: Soil chemical tests — Determination of the organic matter content of a soil — Normal method
AS 1289.4.1.1:1997 Methods of testing soils for engineering purposes - Soil chemical tests - Determination of the organic matter content of a soil - Normal method
AS 1289.D1.1:1977 Methods of testing soil for engineering purposes - Part D - Soil chemical tests - Determination of the organic matter content of a soil (Standard method)
AS 1289.3.9.1:2015 Methods of testing soils for engineering purposes, Method 3.9.1: Soil classification tests — Determination of the cone liquid limit of a soil
AS 1289.3.9:1991 Methods of testing soils for engineering purposes, Method 3.9: Soil classification tests - Determination of the cone liquid limit of a soil
AS 1289.2.2.1:1992 Methods of testing soils for engineering purposes, Method 2.2.1: Soil moisture content tests - Determination of the total suction of a soil - Standard method
AS 1289.4.3.1:2021 Methods of testing soils for engineering purposes, Method 4.3.1: Soil chemical tests — Determination of the pH value of a soil — Electrometric method
AS 1289.D3.1:1977 Methods of testing soil for engineering purposes - Part D - Soil chemical tests - Determination of the pH value of a soil - Standard method
AS 1289.4.3.1:1997 Methods of testing soils for engineering purposes - Soil chemical tests - Determination of the pH value of a soil - Electrometric method
AS 1289.3.5.1:1995 Methods of testing soils for engineering purposes Method 3.5.1: Soil classification tests-Determination of the soil particle density of a soil-Standard method
AS 1289.2.2.1:1998 Methods of testing soils for engineering purposes - Soil moisture content tests - Determination of the total suction of a soil - Standard method
AS 1289.4.4.1:2017 Methods of testing soils for engineering purposes, Method 4.4.1: Soil chemical tests — Determination of the electrical resistivity of a soil — Method for fine granular materials
AS 1289.D3.2:1977 Methods of testing soil for engineering purposes - Part D - Soil chemical tests - Determination of the pH value of a soil - Colorimetric method (subsidiary method)
AS 1289.2.1.2:1992 Methods of testing soils for engineering purposes, Method 2.1.2: Soil moisture content tests - Determination of the moisture content of a soil - Sand bath method (subsidiary method)

British Standards Institution (BSI)

BS 7755-3.7:1995 Soil quality. Chemical methods. Determination of total nitrogen. Modified Kjeldahl method
BS ISO 23400:2021 Guidelines for the determination of organic carbon and nitrogen stocks and their variations in mineral soils at field scale
BS EN ISO 23753-2:2011 Soil quality. Determination of dehydrogenase activity in soils. Method using iodotetrazolium chloride (INT)
BS EN 13654-2:2001 Soil improvers and growing media - Determination of nitrogen - Dumas method
BS EN ISO 23753-1:2019 Soil quality. Determination of dehydrogenases activity in soils-Method using triphenyltetrazolium chloride (TTC)
BS EN ISO 23753-1:2011 Soil quality. Determination of dehydrogenase activity in soil. Method using triphenyltetrazolium chloride (TTC)
20/30399864 DC BS ISO 23400. Guidelines for the determination of organic carbon and nitrogen stocks and their variations in mineral soil at field scale
BS ISO 20620:2021 Fertilizers and soil conditioners. Determination of total nitrogen by combustion
BS ISO 23161:2009 Soil quality. Determination of selected organotin compounds. Gas-chromatographic method
BS ISO 21226:2019 Soil quality. Guideline for the screening of soil polluted with toxic elements using soil magnetometry
BS PD CEN/TS 17728:2022 Organic soil improvers. Determination of specific parameters

Indonesia Standards

SNI 13-4720-1998 Methods for determination of organic carbon content in soils
SNI 13-4721-1998 Methods for determination of total nitrogen content in soils
SNI 13-6793-2002 Test methods for moisture, ash, and organic matter of peat and other organic soils
SNI 1967:2008 Cara uji penentuan batas cair tanah

The Directorate General of Specifications and Metrology (DGSM)

OS GSO ISO 11261:2015 Soil quality -- Determination of total nitrogen -- Modified Kjeldahl method
OS GSO ISO 14235:2014 Soil quality -- Determination of organic carbon by sulfochromic oxidation

Swedish Institute for Standards

SS-ISO 11261:1996 Soil quality - Determination of total nitrogen - Modified Kjeldahl method
SS-EN 13654-1:2002 Soil improvers and growing media - Determination of nitrogen - Part 1: Modified Kjeldahl method
SIS-CEN/TS 17728:2022 Organic soil improvers - Determination of specific parameters

Kingdom of Bahrain Testing and Metrology Directorate

BH GSO ISO 11261:2017 Soil quality -- Determination of total nitrogen -- Modified Kjeldahl method
BH GSO ISO 14235:2016 Soil quality -- Determination of organic carbon by sulfochromic oxidation
BH GSO ISO 17184:2017 Soil quality -- Determination of carbon and nitrogen by near-infrared spectrometry (NIRS)

GCC Standardization Organization

GSO ISO 11261:2015 Soil quality -- Determination of total nitrogen -- Modified Kjeldahl method
GSO ISO 14235:2014 Soil quality -- Determination of organic carbon by sulfochromic oxidation
GSO ISO 23161:2013 Soil quality -- Determination of selected organotin compounds -- Gas-chromatographic method
GSO ISO 17184:2016 Soil quality -- Determination of carbon and nitrogen by near-infrared spectrometry (NIRS)

Korean Agency for Technology and Standards (KATS)

KS I ISO 11261-2008(2021) Soil quality－Determination of total nitrogen－Modified Kjeldahl method
KS I ISO 11261-2021 Soil quality－Determination of total nitrogen－Modified Kjeldahl method
KS I ISO 11261-2008(2018) Soil quality－Determination of total nitrogen－Modified Kjeldahl method
KS I ISO 11261:2008 Soil quality-Determination of total nitrogen-Modified Kjeldahl method
KS F 2104-2013 Standard test method of organic matter contents in soils by ignition loss
KS F 2104-2008 Testing method of organic matter in soils by ignition loss
KS I ISO 14235-2019 Soil quality－Determination of organic carbon by sulfochromic oxidation
KS I ISO 14235-2009(2019) Soil quality－Determination of organic carbon by sulfochromic oxidation
KS F 2104-2023 Standard test method of organic matter contents in soils by ignition loss
KS F 2104-2013(2023) Standard test method of organic matter contents in soils by ignition loss
KS I ISO 14235:2009 Soil quality-Determination of organic carbon by sulfochromic oxidation
KS F 2323-2004 Standard methods for calibration of mechanical soils compactors
KS F 2323-1985 Standard methods for calibration of mechanical soils compactors
KS I ISO 21226-2022 Soil quality — Guideline for the screening of soil polluted with toxic elements using soil magnetometry
KS I ISO 21226:2022 Soil quality — Guideline for the screening of soil polluted with toxic elements using soil magnetometry
KS I ISO 23753-2:2006 Soil quality － Determination of dehydrogenase activity in soils － Part 2: Method using iodotetrazolium chloride(INT)
KS I ISO 14255:2009 Soil quality－Determination of nitrate nitrogen, ammonium nitrogen and total soluble nitrogen in air-dry soils using calcium chloride solution as extractant

International Organization for Standardization (ISO)

ISO 11261:1995 Soil quality - Determination of total nitrogen - Modified Kjeldahl method
ISO 23400:2021 Guidelines for the determination of organic carbon and nitrogen stocks and their variations in mineral soils at field scale
ISO 23753-2:2005 Soil quality - Determination of dehydrogenase activity in soils - Part 2: Method using iodotetrazolium chloride (INT)
ISO 14235:1998 Soil quality - Determination of organic carbon by sulfochromic oxidation
ISO 20620:2021 Fertilizers and soil conditioners - Determination of total nitrogen by combustion
ISO 13878:1998 Soil quality - Determination of total nitrogen content by dry combustion ("elemental analysis")

Spanish Association for Standardization (UNE)

UNE 77318:2001 Soil quality. Determination of total nitrogen. Modified Kjeldahl method.
UNE 103204:1993 ORGANIC MATTER CONTENT OF A SOIL BY THE POTASSIUM PERMANGANATE METHOD.
UNE 103204:1993 ERRATUM ORGANIC MATTER CONTENT OF A SOIL BY THE POTASSIUM PERMANGANATE METHOD.
AENOR UNE-EN 13654-1:2002 Soil improvers and growing media - Determination of nitrogen - Part 1: Modified Kjeldahl method
UNE 103204:2019 Organic matter content of a soil by the potassium permanganate method.
UNE-CEN/TS 17728:2022 Organic soil improvers - Determination of specific parameters (Endorsed by Asociación Española de Normalización in May of 2022.)
UNE-EN ISO 14238:2013 Soil quality - Biological methods - Determination of nitrogen mineralization and nitrification in soils and the influence of chemicals on these processes (ISO 14238:2012) (Endorsed by AENOR in January of 2014.)
UNE-EN 13654-1:2002 Soil improvers and growing media - Determination of nitrogen - Part 1: Modified Kjeldahl method

Bureau of Indian Standards

IS 2720-22-1972 Methods of test for soils: Part 22 Determination of organic matter
IS 2720 Pt.22-1972 Soil Test Methods Part XXII Determination of Organic Matter
IS 14684-1999 Determination of Nitrogen and Nitrogenous Compounds in Soils
IS 2720-25-1982 Methods of test for soils: Part 25 Determination silica sesquioxide ratio

Association Francaise de Normalisation

NF U44-160:1985 Organic soil conditioners and organic material for soil improvement. Determination of total organic matter. Calcination method.
NF X31-111*NF ISO 11261:1995 Soil quality. Determination of total nitrogen. Modified kjeldahl method.
NF ISO 23400:2021 Guidelines for determining organic carbon and nitrogen stocks and their variations in mineral soils at the plot scale
XP U44-720*XP CEN/TS 17728:2022 Organic soil improvers - Determination of specific parameters
NF ISO 11261:1995 Soil quality - Total nitrogen dosage - Modified Kjeldahl method
NF X31-419*NF ISO 14235:1998 Soil quality. Determination of organic carbon by sulfochromic oxidation.
NF U42-504*NF ISO 20620:2022 Fertilizers and soil conditioners - Determination of total nitrogen by combustion
NF EN 13654-1:2002 Soil amendments and growing media - Determination of nitrogen - Part 1: modified Kjeldahl method
NF U44-310-2*NF EN 13654-2:2002 Soil improvers and growing media - Determination of nitrogen - Part 2 : Dumas method.

Association of German Mechanical Engineers

VDI 3865 BLATT 4-2000 Measuring organic soil contamination — Gas chromatographic determination of low-boiling organic compounds in soil air by direct measurement
VDI 3865 Blatt 4-1999 Measurement of organic soil pollutants - Gas-chromatographic determination of volatile organic compounds in soil gas through direct measurement
VDI 3865 BLATT 4-2000 Measuring organic soil contamination — Gas chromatographic determination of low-boiling organic compounds in soil air by direct measurement
VDI 3865 BLATT 1-2005 Measuring organic soil contamination — measurement planning for the investigation of soil air for volatile organic compounds
VDI 3865 BLATT 2-1998 Measuring organic soil contamination — techniques for active soil air sampling

Cuban Institute of Standards and Metrology

NC 93-15-1986 Community Hygiene. Determination of Organic Matter in Soils. Analysis Method

American Association of State Highway and Transportation Officials

AASHTO T 267-1986 Standard Method of Test for Determination of Organic Content in Soils by Loss on Ignition
AASHTO T 194-1997 Standard Method of Test for Determination of Organic Matter in Soils by Wet Combustion
AASHTO T 194-97(R2018) Standard Method of Test for Determination of Organic Matter in Soils by Wet Combustion
AASHTO T 194-1997(2018) Standard Method of Test for Determination of Organic Matter in Soils by Wet Combustion
T 194-1997 Standard Method of Test for Determination of Organic Matter in Soils by Wet Combustion
AASHTO T 194-2022 Standard Method of Test for Determination of Organic Matter in Soils by Wet Combustion
T194-1987 Standard Method of Test for Determination of Organic Matter in Soils by Wet Combustion
AASHTO T 267-2022 Standard Method of Test for Determination of Organic Content in Soils by Loss on Ignition
AASHTO T 267-1986(2018) Standard Method of Test for Determination of Organic Content in Soils by Loss on Ignition
AASHTO T 267-86(R2018) Standard Method of Test for Determination of Organic Content in Soils by Loss on Ignition
T194-1997 Standard Method of Test for Determination of Organic Matter in Soils by Wet Combustion (Twentieth Edition)

National Standardisation Body (ASRO)

SR 7184-3-2001 Soil - Determination of density. Pycnometer method using organic solvent
STAS 7184/2-1985 SOILS Nitrogen content determination

German Institute for Standardization

DIN ISO 11261:1997-05 Soil quality - Determination of total nitrogen - Modified Kjeldahl method (ISO 11261:1995)
DIN 19746:2005-06 Soil quality - Determination of mineral nitrogen (nitrat and ammonium) in soil profiles (Nmin laboratory method)
DIN EN ISO 14238:2014-03 Soil quality - Biological methods - Determination of nitrogen mineralization and nitrification in soils and the influence of chemicals on these processes (ISO 14238:2012); German version EN ISO 14238:2013
DIN ISO 23753-2:2006 Soil quality - Determination of dehydrogenase activity in soils - Part 2: Method using iodotetrazolium chloride (INT) (ISO 23753-2:2005);English version of DIN ISO 23753-2:2006-04
DIN EN 13654-1:2002-01 Soil improvers and growing media - Determination of nitrogen - Part 1: Modified Kjeldahl method; German version EN 13654-1:2001
DIN 19746:2005 Soil quality - Determination of mineral nitrogen (nitrat and ammonium) in soil profiles (Nmin laboratory method)
DIN CEN/TS 17728:2022-05 Organic soil improvers - Determination of specific parameters; German version CEN/TS 17728:2022

Ente Nazionale Italiano di Unificazione

UNI EN 13654-2:2001 Soil improvers and growing media - Determination of nitrogen - Dumas method
UNI EN 13654-1:2001 Soil improvers and growing media - Determination of nitrogen - Modified Kjeldahl method
EC 1-2023 UNI EN 13654-1:2001 Soil improvers and growing media - Determination of nitrogen - Modified Kjeldahl metho
UNI ISO 23400:2024 Guidelines for the determination of organic carbon and nitrogen stocks and their variations in mineral soils at field scale
UNI CEN/TS 16177:2012 Sludge, treated biowaste and soil - Extraction for the determination of extractable ammonia, nitrate and nitrite
UNI CEN/TS 17728:2022 Organic soil improvers - Determination of specific parameters
UNI EN ISO 23753-1:2011 Soil quality - Determination of dehydrogenase activity in soil - Part 1: Method using triphenyltetrazolium chloride (TTC)
EC 1-2023 UNI EN 13654-2:2001 Soil improvers and growing media - Determination of nitrogen - Dumas method

Standards New Zealand

NZS 4402.3.1.1:1986 Methods of Testing Soils for Civil Engineering Purposes Part 3.1: Soil Chemical Tests - Determination of the Organic Matter Content Test 3.1.1: Standard Method by Titration
NZS 4402.3.1.2:1986 Methods of Testing Soils for Civil Engineering Purposes Part 3.1: Soil Chemical Tests - Determination of the Organic Matter Content Test 3.1.2: Subsidiary Method by Ignition

Netherlands Institute for Standardization

NEN 5754-1992 Soil - Determination of organic matter content in soil as loss-on-ignition

Belgian Standards Institute

NBN T 91-255-1976 Water analysis methods - Determination of the ammoniacal and organic nitrogen - (Kjeldahl nitrogen)

Danish Standards Foundation

DANSK DS/ISO 23400:2021 Guidelines for the determination of organic carbon and nitrogen stocks and their variations in mineral soils at field scale
DS/ISO 23400:2021 Guidelines for the determination of organic carbon and nitrogen stocks and their variations in mineral soils at field scale
DANSK DS/CEN/TS 17728:2022 Organic soil improvers – Determination of specific parameters
DANSK DS/EN 13654-1:2001 Soil improvers and growing media - Determination of nitrogen - Part 1: Modified Kjeldahl method
DS/EN 13654-1:2002 Soil improvers and growing media - Determination of nitrogen - Part 1: Modified Kjeldahl method

European Committee for Standardization (CEN)

CEN/TS 17728:2022 Organic soil improvers - Determination of specific parameters
FprCEN/TS 17728-2021 Organic soil improvers - Determination of specific parameters
CEN EN 13654-1-2001 Soil Improvers and Growing Media - Determination of Nitrogen - Part 1: Modified Kjeldahl Method

Standards Norway

SN-CEN/TS 17728:2022 Organic soil improvers - Determination of specific parameters
NS-EN 13654-1:2001 Soil improvers and growing media — Determination of nitrogen — Part 1: Modified Kjeldahl method

American Society for Testing and Materials (ASTM)

ASTM D2974-07a Standard Test Methods for Moisture, Ash, and Organic Matter of Peat and Other Organic Soils
ASTM D2974-07 Standard Test Methods for Moisture, Ash, and Organic Matter of Peat and Other Organic Soils
ASTM D2974-13 Standard Test Methods for Moisture, Ash, and Organic Matter of Peat and Other Organic Soils

Czech Standards Institute (UNMZ)

CSN 72 1021-1970 Laboratory determination of organic substances in soils