Field Notes

Twitchell Alfalfa: 2016-12-21 10:30:00 (DOY 356)
Author: Elke Eichelmann
Others: Joe Verfaillie, Sam Chamberlain

Summary: LI7550 box fried, door was open when we got to the site

Arrived at 10:30. It was sunny and mostly clear with some fluffy clouds and a light breeze.

The sheep have moved beyond the tower and are now east of the tower. There did not seem to be any damage from sheep chewing but it didnâ€™t seem like there was much alfalfa left to clip. They must have come right up to the tower.

The door of the LI7550 box was standing wide open when we got to the site. Was probably left open during the last visit. Even though there seemed to be data collected the LI7500 showed an error and no CO2 or H2O data was available. The signal strength read 0.1 even after we cleaned the LI7500 windows. The lower circuit board in the 7550 box looked like it had gotten wet and was a little corroded. Joe tried cleaning it with ethanol but that also did not change the data. We decided to bring back the 7550 box sn AIU-0674 and the 7500 head sn 75H-2668 for more testing in the lab. (The metal connector for the LI7500 head was also brought back to the lab, should be brought back out when new box and head are setup!)

The met datalogger box was locked when we got there but it did look like it had also gotten wet inside and smelled damp and moldy when I first opened it. Everything seemed to be working fine there, though.

We collected USB GHG data (not sure how much of this is good), collected met data, collected soilCO2 data, collected radiation data. Swapped CF camera card. Collected forced diffusion chamber data and cycled power on the forced diffusion chamber.

Joe finished wiring the radiation sensors to the met CR1000 datalogger and dismantled the CR10X (sn 35474) and brought it back to the lab. He sent the new program to the CR1000 that reads the radiation sensor components as well.

Did soil respiration measurements.
Did not collect biomass or veg height measurements since the Alfalfa had just been eaten by sheep.
Did not do spectral since it was a little cloudy.

Left at 11:35

0 photos found

7 sets found

Can't check TA_met
11 TA_met graphs found