Field Notes

Twitchell Alfalfa: 2014-07-02 11:10:00 (DOY 183)
Author: Patty Oikawa
Others: Joe, Madeleine, Kathleen

Summary: Installed Picarro, water additions to collar, heat flux plate loose

Arrived at 11:10am. We installed the Picarro and forerunner chamber using 3 marine batteries and inverter. Chamber was working by 11:30am. Kathleen collected clip plots and Madeleine measured veg height. I noticed that a heat flux plate (HFP01-15 6342) was sitting on the soil surfaceâ€”must have been pulled up by accident. Kathleen reinstalled it 2cm beneath the soil next to the towerâ€”this needs to be reburied later. Joe used the weed wacker to cut down tall weeds around the tower.
We returned to this site later to add water to the collar. We added 665mL water to the collar at 14:31. This elicited a huge CO2 and N2O response. N2O went from 0.33ppm to 11pm and CO2 went from 400ppm to 1890ppm inside the chamber!
The Picarro was disassembled and moved back to Sherman at 16:34.

7500
CO2: 395.8 umol/mol
H2O: 686.0 mmol/m3
SS: 94.1%
Pressure: 100.9 kPa
Temperature: 25.8ËšC
SOS: 348 m s-1

Met: OK

Veg Height (cm): Tape measure from ground to top of plant
30, 40, 20, 35, 25, 40, 40, 40, 30, 25, 25, 20, 25, 15, 35, 30, 40, 20, 25, 30, avg = 29.5, stdev = 7.93

1 photos found

TA_autocam_20140702_1945.jpg ( 2014-07-02 19:45:02 ) Full size: 1920x1440
Smoke at dusk