Field Notes

Bouldin Alfalfa: 2018-10-18 10:10:00 (DOY 291)
Author: Joe Verfaillie
Others: Daphne, Kyle

Summary: Tested tipping bucket, swapped 7500, removed 7700 for power board upgrade, clip plots, LAI, spectral, veg height.

Bouldin Alfalfa
2018-10-18

I arrived at 10:10 with Daphne and Kyle. It was sunny and mild with hazy horizons and little wind. The alfalfa is tall and slightly damp with dew. There were cranes on the fields to the north and Kyle saw some kind of seal like creature in the water near the marina.

We cleaned and tested the tipping bucket sn 65560-615. We connected it to a CR6 and dribbled 475ml of water through it. This should result in 100 tips â€“ we got 90 tips. We adjusted the set screws in the bottom by one full turn clockwise (+4-6%).

We swapped the 7500 sn 75H-2150 came off and sn 75H-2667 went up.
2150 read: 415.0ppm CO2, 614.9mmol/m3 H2O, 17.7C, 102.1kPa, 95.2SS
2667 read: 423.0ppm CO2, 609.0mmol/m3 H2O, 18.5C, 102.0kPa, 105.4SS
The pressure coefficients were updated and the box reset.

The 7700 read: 2.1ppm CO2, 51RSSI
We removed the 7700 sn TG1-0424. It needs a new power board and will be used to swap out the other two 7700s that also need power board upgrades. The cable ends were put pointing down into the top on the scaffolding post. The wash reservoir was full. The Licor software was reporting a time sync error on the 7700 before it was removed.

Daphne did LAI and spectral measurements: 2-wand setup, BA1018 = NW, BA1018-2 = SW. Spectral: 89-99 is ref/dark/5 samples x 2, 99-09 is ref/dark/up + down pairs x 5

The Radiometers, Arable and camera window were cleaned.

Clip plots and veg height were done.

We left at 10:55

Next Mowing: 2018-10-24

Veg Height (cm): Tape measure from ground to top of plant
38, 47, 45, 56, 43, 57, 45, 44, 42, 52, 61, 53, 56, 48, 60, 44, 44, 45, 37, 45, avg = 48.1, stdev = 7

0 photos found

7 sets found

5 BA_flux graphs found