Abstract

This document specifies a method for the determination of nitrogen in soil improvers and growing media. The Kjeldahl method determines ammonium-N, nitrate-N, nitrite-N and organic N content of soil improvers and growing media. Nitrogen in N-N-linkages, N-O-linkages and some heterocyclics (especially pyridine) is only partially determined [6], [7], [8]. NOTE This method has been validated in an interlaboratory study with specific products that were present on the market during the study (as included in Annex A, being composted bark (20 mm to 40 mm, biowaste compost (Rottegrad 3), green compost (Rottegrad 5, 0 mm to 15 mm), solid digestate, liquid digestate, soil improver (pellets, sieved 4 mm, growing media blend 1 (white peat, green compost, wood fibre, lime, inorganic fertilizer (NPK + micro elements)), growing media blend 2 (white peat, black peat, expanded perlite, lime, organic fertilizer) and growing media blend 3 (white peat, black peat, clay, inorganic fertilizer (NPK + micro elements))).

Begin

2023-04-23

WI

00223108

Planned document number

DIN EN 13654-1

Project number

05702218

Responsible national committee

NA 057-03-01 AA - Soil improvers and growing media  

Responsible european committee

CEN/TC 223/WG 4 - Analytical methods  

draft standard

Soil improvers and growing media - Determination of nitrogen - Part 1: Modified Kjeldahl method; German and English version prEN 13654-1:2025
2025-11
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previous edition(s)

Soil improvers and growing media - Determination of nitrogen - Part 1: Modified Kjeldahl method; German version EN 13654-1:2001
2002-01

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