Lux marginal land site visited by Kevin/Stacey today. Found many corner posts and sockets pulled out and also north side of G10R3 found soil moisture probes dug up and chewed. Will not be able to repair. They are soil moisture profiler sensors for this plot..

BCSE202410071104S16S17BGC run had some submitted samples out of order. All samples run on GC in numerical order. Series 16 samples out of order, submitted in following sequence: …10, 11, 16, 13, 14, 15, 20, 17, 18, 19, 12, check, 21, 22….

KK/SV finished switchgrass gradient deep cores today, 6 plots (12 cores). Total of 64, two per plot. Core 1 was always in the south half of the plot and Core 2 in the north.

Completed all but 12 deep cores on the Switchgrass Gradient project. KK/DW Still need to collect inorganic N samples and another gas sample due soon.

Deep core of Switchgrass N Rate trial started today. KK/DW We cored the western 6 plots, 12 cores just after strip harvest.

Removed all chambers from SWFG study for harvest.

Adjusted all chamber heights in gashog to reflect reinstalled ht.

GC Run SWFG series39 10/8/2024 2 vials out of order at sampling: 14 and 15 were switched at sampling, so will be run in the order …12, 13, 15, 14, 16, 17…. GC Run SWFG series41 10/23/2024 2 vials out of order at sampling: 93 and 94 were switched at sampling, so will be run in the order …92, 94, 93, 95, 96….

Removed G5 autochambers for microplot harvest in the afternoon. Turned off chambers on gashog.

Dave and Kevin replaced the chambers on G1 and restarted sampling. G1-3 overextending. Raised all tubing off the ground. Chambers removed 10/22 pm

Checked all chambers in G1 and G5, except G5-5 (closed at the time). Trimmed corn leaves out of the path of the closures on G1 chambers. Most G5s were in good shape and required minimal trimming on this visit. All G5 lid connections appeared to be intact and working properly.

BCSE202407190731S12S13BGC: All vials run in consecutive order. Vials submitted by techs in this order for Series 12: 1, 18, 3, 4, 5, 14, 7, 8…. ….12, 13, 6, 15, 16, 17, 2, 19, 20, 21…. all other vials in order.

G5-3 chamber lid fixed. May have been okay up to point of checking lids, but arm attachment popped off when checking. Fixed.

I removed the radio, datalogger, TDR100, relay, battery and antenna from the DF site.

Running 3 series of GLBRC gas samples. Notes on Series 6 from Techs - Vials 1-40 swapped, i.e. vials 1-20 are actually vials 21-40 regarding site sampling. Series 7 no notes. Series 8 - a number of vials out of order. All samples run in numerical order. Series 8 vial order in trays: 1-40 ok, then 41, 42, 59, 60, 45, 46, 55, 56, 49, 50, 51, 52, 53, 54, 47, 48, 57, 58, 43, 44, 61, 62, 63,…

Removing G1 lids for herbicide today. 4 Hr REI.

Approximately 4pm, trimmed switchgrass and any other plant material growing out of the G5 automated chambers. Also checked lids and trimmed any plants outside of chambers that were interfering with lid seals.

GLBRC Series 4 vials. Note from techs that vials 1 and 21 were swapped (i.e. 21, 2, 3, 4, 5…20, 1, 22, 23, etc.). Still run on GC in consecutive order (1, 2, 3, etc…)

It appears the ICOS needs to have the mirrors cleaned. Likely some water entered the system over the weekend. Caliubration worked but sensitivity is down, and noise up.

Trailer went down over the weekend. ICOS concentrations way off and flow blocked. Found issue with valves, then recalibrated ICOS with our reference gas. Added lids back on G1 last Friday. Currently not running trailer until morning.

Removed chambers on the SWFG for fertilization. Will install tomorrow and clip in AM, then sample after lunch.

G1-6 showing negative CO2. Will check. Also removing chambers on SWFG for fertilization today.

G5-3 updated chamber depths after moving: corner heights - 32.5cm, 32.2cm, 31.0cm, 30.0cm; center height - 29.5cm.

Moved chamber 5-3 approximately 1 meter to the west to encompass some switchgrass plants, approximately 2pm. Trimmed all chambers in G5. Replaced clamp head on G1-5 (previous one had popped off a couple times).

BCSE automated chamber notes: G1-5: discovered a missing nut/bolt combo on lid that may leak air. Plugged temporarily with weatherstripping on both sides of hole. G5-1, 5-3, 5-4 chambers have very little to no switchgrass growth inside the chambers. May be time to move them to be more representative of the plot. G5-2: switchgrass growth to a few inches above top of chamber. This was trimmed back to being even/slightly below top of chamber.