1989 July: tube #1 in 004B was damaged by a truck; it was replaced approximately 2 m away in December 1991. The new tube extended 23 cm above the ground instead of the normal 8 cm. In January 1993, the tube was cut to an 8 cm protruding height to conform to heights of other tubes. Thus readings from December 1991 to December 1992 were actually 15 cm above their indicated depth (i.e. 10, 35 and 60cm instead of 25, 50 and 75).

1992: Four tubes in N01B were abandoned because of potential contact problems between humans and bison. There are readings from 1983 until April 1992.

1998: Old probes (#1 and #2; Troxler, Model 3400) were replaced with Troxler, Model 4300. #3 arrived in January and #4 arrived in May.

1998 May to December: problems with access tube at N04D #2 tube-no readings.

1998 June: tubes in R01A (was 020A), R01B (was 020D) and R20A (was 001A) were added.

2001 Spring: fire reversal experiment began. This impacted the burn schedule of 4 watersheds. 001A became R20A. 001C became R20B. 020A became R01A. 020D became R01B.

2001: Continued, intermittent problems with N04D #2 from September 2001 to May 2002 and October 2002 to May 2003-no readings. From late May 2003 to March 2004, able to get readings but the probe was NOT completely seated on the access tube. Cause of problem, damage to access tube from bison activity.

2004 March: Unable to get readings from either N04D tube-both damaged by bison activity.  In late May, cut off the upper edge of access tubes (less than 2 cm removed from top). Bison barriers put out around all tubes in the bison area (N04D and N20B).

June 2005 to June 2006: Chronic problems with #3. The unit was in and out of Troxler’s TX and SC repair shop. During this time, readings were predominantly done by #4.

June 2006 to February 2009: chronic problems with #4. In and out of Troxler’s SC repair shop. During this time, readings were predominantly done by #3.

2006: New stand for taking standard counts has been built. The original stand was 25 cm. According to the Troxler manual, it should have been 25 inches. There have been no changes in the readings.

2010: July - All access tubes were supposed to have a standardized height of 8cm (protruding aboveground). Most of the tubes were not at this height. On July 14, all tubes were measured and those needing adjustment were cut with a hack-saw. Note that 3 sites, (N20B #1, N04D #1, and N04D #2) are below the standardized height. Both N04D sites were cut in May 2004 due to bison damage.2010: September 3, R01A was discontinued due to damage when cutting.

2015: Fall - No soil moisture readings from August through November 2015. Troxler machines no longer working. A new machine has been ordered.

2015: December - Soil moisture readings done with new machine. There are some differences from the old machine. 1.The new probe is slightly longer, and 2.There are only 7 depth markers. Therefore, 200cm depths will no longer be done. The new machine reports in g/cc. All data sheet measurements will be multiplied by 1000 to maintain the historic use of kg/m³

2015: new soil moisture probe. InstroTek CPN 503 Elite Hydroprobe. The new machine only had 7 stops; the Troxler machines had 8. The probe is slightly longer on the Hydroprobe. Also, measurements are given in g/cc; all readings are multiplied by 1000 to maintain the records in kg/m³

2017: August 25 - bison damaged access tube #1. Top 0.5 inch has been cut off to repair the damage.

2018: April 12 - bison damaged access tube #1 again. Top 0.25 inch has been cut off to repair the damage. In addition, the Konza Staff made us 8 new spikes to help hold the barrier fence in place.

2018: August 9 - 2 cm of pipe removed from 0001d #2 to repair damage that was preventing the probe from fitting for readings.