Field Notes

Twitchell Alfalfa: 2013-09-11 13:30:00 (DOY 254)
Author: Cove Sturtevant
Others: Dennis, Sara, Eva

Summary: Standard site visit. Swapped 7500 head (removed sn 2180, installed sn 0065). All good.

Twitchell Alfalfa
2013-09-11

We arrived about 13:30 PDT. It was mostly sunny, breezy and warm (23 C). The alfalfa continues to grow and flower. I downloaded data while Sara, Dennis, and Eva swapped out the 7500 head (removed sn 2180, installed sn 0065). I downloaded the coefficients of the previous 7500 and uploaded the new ones. Afterward I changed the pressure coefficients back to the correct values for the 7550 box at the site.

7500 readings:
CO2 = 390 ppm (392 after cleaning, 385 after swap)
H2O = 700 mmol m-3 (680 after cleaning, 700 after swap)
SS = 92.6% (93.4% after cleaning, 71.7% after swap)
T = 25.8 C
p = 101.4 kPa
sos = 348.4 m s-1

7700 readings:
CH4: 1.86 ppm (same after cleaning)
RSSI: 40% (78% after cleaning)
Reservoir was full

MET looked good.
Radiation looked good.
Cleaned radiation instruments.

We took 15 measurements of vegetation height - averaging at 40 cm.

Veg Height (cm): Tape measure from ground to top of plant
45, 44, 56, 43, 36, 35, 49, 26, 35, 30, 51, 51, 0, 32, 57, avg = 39.3, stdev = 14.48

0 photos found

7 sets found

Can't check TA_met
11 TA_met graphs found