Field Notes

<--2022-06-08 14:30:00 | 2022-07-14 11:20:00-->
Other sites visited today: Hill Slough | Bouldin Corn

Bouldin Alfalfa: 2022-06-28 10:50:00 (DOY 179)
Author: Carlos Wang
Others:

Summary: Regular data collection/cleaning for 3 towers, Landsat 8 overpass survey, SKIPPED CR1K IRT, FD chamber, and Jaz

I arrived at the field around 10:50 PDT, it was warm with damped breeze. Alfalfa was about knee high. The field hasn't been mowed, so I skipped cutting. But we will need to cut the alfalfa next time we go out.

I started the maintenance at the main tower and started doing overpass survey around 11:25. The field was relatively homogeneous with some patchiness. I chose to take only canopy skin temperature. I pointed the sensor at a bare soil place, and it was already !!! 61.5 deg C !!! around 11:55 PDT.

>>>> Main tower <<<<
I downloaded the MET data (5min and 30min) and checked them. There was a 25sec time difference, and I synced the logger time to the laptop time.

I downloaded the USB GHG data and checked the ambient conditions:
- The 7500 read: 401ppm CO2, 537mmol/m3 H2O, 29.6C, 101.5kPa
- I went up and cleaned MET and flux sensors. The SS went from 95.8 to 99.3.

I also swapped the card for the lower sonic. There was bird droppings right on one of the transducers, and I cleaned it off.

>>>> Bouncer tower <<<<
I arrived at bouncer ~12:40 PDT, collected MET data (CR23X), swapped the microSD (CR6), and collected the USB GHG data. Clock was less than 5sec apart, but synced. I forgot to write down the conditions from 7500, but the SS went from 97.01 to 99.5 after cleaning.

>>>> Edgy tower <<<<
I arrived at edgy ~13:30 PDT, collected MET data (CR23X), swapped the microSD (CR6), and collected the USB GHG data. Clock was less than 5sec apart, but synced. I forgot to write down the conditions from 7500, but the SS went from 99.5 to 101.9 after cleaning.

I left the field around 14:00 PDT.

Veg Height (cm): Tape measure from ground to top of plant - Near main tower
40, 28, 52, 56, 32, 47, 35, 41, 32, 53, 58, 45, 35, 46, 58. Avg = 43.9; St.dev = 10.1.

Next Mowing: 2022-07-05

0 photos found

7 sets found

4 BA_flux graphs found