# Commission Regulation (EC) No 1737/2006 of 7 November 2006 laying down detailed rules for the implementation of Regulation (EC) No 2152/2003 of the European Parliament and of the Council concerning monitoring of forests and environmental interactions in the Community, Division II.2: Sampling depths

Extent: E+W+S+N.I.

Lysimeters shall be installed at fixed depths but installation by horizons is also acceptable.
Soil solution collectors
Where appropriate lysimeters shall be placed at least two depths, i.e. one within the rooting zone (suggested depth is 10 to 20 cm) to gain insight into concentrations of nutrients and toxic elements near the fine roots (aim 1) and one below the rooting zone (suggested depth is 40- 80 cm), to estimate the element output (aim 2). A third lysimeter may also be placed immediately below the humus layer.

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Source: https://www.legislation.gov.uk/eur/2006/1737/annex/I/chapter/7/division/II/division/II.2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2006-1737/annex-I/chapter-7/division-II/division-II.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.