Field Notes

Twitchell Alfalfa: 2013-11-06 14:30:00 (DOY 310)
Author: Cove Sturtevant
Others: Sara, Patty

Summary: Standard site visit and data download. NirIn channel of NDVI sensor looks low.

Twitchell Alfalfa
2013-11-06

We arrived about 14:30 PST. It was sunny with hazy high clouds, warm (22 C), and relatively calm with a light breeze from the east. The alfalfa is green and steadily regrowing. There were spider webs streaming off the tower and any raised surface. I checked the tower and downloaded data while Sara and Patty did clip plots and other tower maintenance. I did a veg height transect at the end.

7500 readings:
CO2 = 334 ppm (405 after cleaning)
H2O = 530 mmol m-3 (376 after cleaning)
SS = 62.1% (76.8 % after cleaning)
T = 22.0 C
p = 102.2 kPa
sos = 348.8 m s-1

7700 readings:
CH4: 2.3 ppm (2.1 ppm after cleaning)
RSSI: 8% (83% after cleaning)
Reservoir was empty refilled and changed settings to clean every 4 hours.

MET looked good.
NirIn channel of NDVI sensor looks low.
Cleaned radiation - sensors were pretty dirty.

Washed solar panels.
There was no water in the well.

Veg Height (cm): Tape measure from ground to top of plant
12, 21, 16, 20, 21, 0, 26, 10, 50, 17, 29, 20, 25, 26, 11, 31, 20, 11, 15, 6, avg = 19.4, stdev = 10.67

0 photos found

7 sets found

Can't check TA_met
11 TA_met graphs found