Field Notes

<--2015-09-30 12:00:00 | 2015-10-29 11:30:00-->
Other sites visited today: Mayberry | Twitchell Rice | East End | West Pond

Twitchell Alfalfa: 2015-10-15 12:30:00 (DOY 288)
Author: Joe Verfaillie
Others: Patty, Ian

Summary: Western half of field mowed, Installed diffuse PAR sensor, spliced SHF 3, Patty did soil respiration

Alfalfa
2015-10-15

I arrived about 12:30 with Patty and Ian. The western half of the field has been mowed and one pass along the edges including in front of our tower. The squirrels are still active but didnâ€™t burry or damage anything more.

I installed a rotating shadow band diffuse PAR sensor sn 040411. The sensor is bolted to the 4x4 that holds the camera and points to the south over the edge of the solar panels. I collected data from the CR1000 and then uploaded a new program. The new program runs the diffuse PAR sensor in the main scan at 2Hz. The rest of the met data runs in a slow sequence every 10sec. This seems to work, but needs to be watched.

The 7500 read: 389.2ppm CO2, 591.5mmol/m3 H2O, 91.6SS, 30.67C, 101.22kPa
After cleaning: 96.6SS

The 7550 clock was off. At 12:11 I reset it from 12:06
The 7550 bandwidth setting was 5Hz, I changed it to 10Hz since we are running at 20Hz.

Patty did soil respiration with a motorcycle battery to run the 6400. Soil respiration was 3.5 â€“ 5.5 umol/m2/s

I spliced heat flux #3 cable where the squirrels had chewed it several weeks ago. It was reading 1.29mV afterwards.

3 photos found

20151015TA_DiffusePAR.jpg ( 2015-10-15 13:34:16 ) Full size: 1920x1440
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