Division II.1 Selection of sampler location

Soil solution samplers shall be installed close to where crown condition assessment is conducted. Lysimeters may be distributed randomly or systematically over the whole plot although this may be limited by the presence of stones or stems (distance from a tree is not specified). Because of disturbances to the soil, zero-tension lysimeters shall not be installed in the central part of the plot where tree parameters are monitored. For practical reasons, a representative subplot can be used. Lysimeters that have already been installed may be maintained, but new installations shall be made as proposed above.