Results (
Thai) 1:
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We collected casts from each microcosm once to twice a weekfor 180 days. This frequency was chosen in order to collect freshcast material during the whole experiment. Casts had to becollected manually from the entire microcosm in order to obtainsufficient cast material for chemical and physical analyses (seeClause et al., 2014). The resulting repeated disturbance of themicrocosms was also applied to microcosms with no earthworm(controls). Cast material from each microcosm and control soilswere air-dried, analyzed (see below) and stored for 6 monthsbefore they were used for the present experiment (darkness, roomtemperature). All data on chemical properties of casts wereobtained at this stage, i.e., prior to the shaping of artificial casts, andnot at the end of the experiment due to the scant amount ofmaterial. These chemical properties were: contents in NO3, NH4+,CaCO3, total carbon and nitrogen content, C:N ratio, contents oforganic carbon and other mineral nutrients (Na, P, Mn, K), pH andCEC (cation exchange capacity)(see Clause et al., 2014 for details
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