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Fig. 4. Water content and moisture potential histories since start of water application, 11 July 2001. (A) Reflectometer data; (B) the moisture potential record, as measured with in-situ tensiometers; (C) the average water content calculated from the column water balance data. Note that the reflectometer at Level 1 malfunctioned and was used only as a relative measure of water content. Lettered vertical lines indicate the date of (a) the Br– injection, (b) soil sampling, (c and d) sulfur hexafluoride gas injections, and (e) the 14C-labeled bicarbonate injection.
