Verification periods and soil levels under surface:

Winter 2013-2014 5 cm depth 10 cm depth 20 cm depth 50 cm depth 100 cm depth

Spring 2014 5 cm depth 10 cm depth 20 cm depth 50 cm depth 100 cm depth

Summer 2014 5 cm depth 10 cm depth 20 cm depth 50 cm depth 100 cm depth

Autumn 2014 5 cm depth 10 cm depth 20 cm depth 50 cm depth 100 cm depth

Winter 2014-2015 5 cm depth 10 cm depth 20 cm depth 50 cm depth 100 cm depth

Spring 2015 5 cm depth 10 cm depth 20 cm depth 50 cm depth 100 cm depth

Summer 2015 5 cm depth 10 cm depth 20 cm depth 50 cm depth 100 cm depth

Autumn 2015 5 cm depth 10 cm depth 20 cm depth 50 cm depth 100 cm depth

Winter 2015-2016 5 cm depth 10 cm depth 20 cm depth 50 cm depth 100 cm depth

Spring 2016 5 cm depth 10 cm depth 20 cm depth 50 cm depth 100 cm depth