Projectlog Entries List

GC run on Dawn GC: LTAR, Series 19, 07/23/2026. Two vials submitted out of order - 40 before 39. These were switched to proper order on the GC rack and all vials run sequentially. In addition, there was an issue with LTAR Series 18 being stuck on "acquiring" at the very last standard in it's sequence. This caused an issue with loading the Series 19 run, until the Series 18 was aborted for the last standard, and the run cleared from the Run Queue. I think everything worked out, but there may be no data for that last standard on series 18.

BAU Tower 2 (soybeans) raised to 7ft. Soybeans at tower are at a height of 2 ft. Original tower height was 6 ft. Raised to 7 ft. to be 5 ft above canopy, which is approximately 1.5m difference (between tower sensors and top of canopy).

LTAR Series 18, 07/20/2026 GC run. Two samples submitted out of order. All samples run sequentially. Sample vials 80 and 79 were swapped in racks submitted for analysis (i.e. vials ordered ...76, 77, 78, 80, 79, 81....).

LTAR gas vial and tote prep - Sam, Jon

Measure then filter LTAR leachate, filter LTAR soil extracts, dishes - Glori, Bella, Sam

Sort ASP6 ANPP plants - Stacey, Alyssa, Jon, Emily

Weigh LTAR soil for extraction and moisture -

Sort ASP6 ANPP plant samples - Stacey, Jon, Sam, Emily, Brian, Bella, Glori, Jordyn

Sieve LTAR soil samples -

Sort ASP6 ANPP -

Weigh LTAR plants - Jon, Jordyn

Sort ASP1 forage - Emily, Brian, Bella, Jon, Sam, Olivia

Pack CN - Sam, Bella

Dishes, lab clean-up - Jordyn, Glori

NAS vial prep and data entry - Olivia

Measure and filter LTAR leachate, filter LTER soil extracts, LTAR and BCSE gas vial prep - Jordyn, Glori, Emily, Brian

Sort ASP1 forage - Sam, Jon

Prepared Standards.

Lachat run LTAR Lysimeter 20260616. Notes from run:

• Vial labeled ASP2 R1 N should not exist, not enough volume. Ran as vial ASP2 R2 N, that should exist and is missing.
• Vial ASP6 R2 S was missing from box and should exist, not run.

Sieve LTER soil -

Weigh LTER soil for extraction and moisture - Alyssa,

Sort ASP1 forage, empty ovens - Alyssa

Measure and filter LTER leachate - Sam, Jordyn, Glori

Reshake then filter LTER T3, T4 soil extracts - Emily, Brian

Prep LTAR gas vials, totes - Jordyn, Glori

LTAR Moved IRGASON from tower 3 to tower 4 after calibration. Removed 1375 for calibration and will move to tower 1. SN1421 now on tower 4. Did this around 11:30. Raised sensors to 11'.

LTAR 16 gas sampling and Hydrosense - Bella, Glori, Sam, Brian, Emily

NAS gas and Hydrosense sampling - Olivia

Install T3 tall flags and T-posts - Jon, Jordyn

Cut T1, T2 corn paths - Emily, Olivia, Jon, Bella, Brian, Stacey

Dishes - Jordyn

Measure and filter LTAR leachate - Sam, Glori

Filter LTER soil extracts - Jordyn, Jon

LTAR gas chamber prep - Brian, Jon, Sam

Sticky traps - Brian, Emily

Collect LTAR leachate - Sam, Jon

BCSE 11 gas sampling and Hydrosense - Emily, Glori

BCSE gas chamber prep, then evacuate LTAR lysimeters - Emily, Brian

Sticky traps - Jon, Sam, Emily

Bury T21 soil bags. Bury whirl-paks in their corresponding plot. Measure or pace ~7m in a NE direction from the SW corner of each plot. At that point, place a meterstick perpendicular to the tape measure at the 50cm mark on the meterstick. Bury T21 A at one end and T21 B at the opposite end. In corn and poplar plots, the spacing should be adjusted to ensure both bags are buried within a row of wheat or poplars. Each bag gets buried over an orange garden marker at about a 45-degree angle with the top of the bag about 1” below the surface and the marker sticking out of the ground 1-2”. For removal in 21 days - someone can pull up on the orange marker to easily remove the bags. For burial, use a trowel or narrow shovel to lift the soil, place the marker and bag, and then remove the trowel and press down the soil to ensure contact with the buried bag. Try to disturb the plants as little as possible. A flag is placed at the 50cm point midway between the buried bags to help in locating them later. In T1-4 the flag should be in a corn row between the buried bags with all bags and flags within a row of corn. Wherever helpful, tie flagging tape on a plant above the flag, so it is easily located for collection.

• Emily, Brian, Jon, Sam, Glori, Stacey

Weigh LTER soil for extraction, moisture and T21 incubation - Glori, Jordyn, Brian around 11

BCSE and LTAR gas vial prep - Jordyn

LTAR Tower 3. EE-181 probe, Adjusted the range to 1V and made sure the wires were connected. It's sending reasonable values now.

Adjusted the sonic_azimuth of the 4 towers to 225 degrees. For some reason I had 255 degrees. The correction was made between 12:00 and 13:00. I will adjust the past values to subtract 20 degrees.

On towers 3 and 4:

The EE181 probes were on switched power, I'm going to turn on the switched power at the beginning of the slow sequence and not turn it off again. The first measurement after a restart might be wonky, since the sensor takes 2 seconds to warm up.

On tower 4 we are getting reasonable values, on tower 3 we are getting NaN's.

I changed the default multiplier on the apogee sensor from -1 to 1, the Apogee voltage or the connections are reversed from the CS310. The correction factor is 100.

Updated program on tower 4 (BAU) with updated CNR4 calibration factors

Connected ltar tower 4 (BAU) with the wifi connection. Reinserted one heat flux plate and connected the VOLT116 to the datalogger.

Connected the Volt116 to the datalogger at tower 3 (ASP) and updated the heat flux plate calibration factors. Adjusted the azimuth to 255.

Installed the access point at the plant ecology field lab.

After discussions with Jackie Gerson (via email), Stacey, Brook, Dave, and Phil (separately), we decided to stick with the Nalgene collection bottle system for the LTAR lysimeter program. This would allow adequate technique for inorganic N, DOC, metals, nutrients, but not Hg or PFAS (need glass which is not in our purview at this time). Purchase caps with proper adapters from DMR (Prenart) and bottles from Fisher sci.