Field Notes

<--2015-10-29 11:30:00 | 2015-11-25 12:19:00-->
Other sites visited today: Mayberry | Twitchell Rice | East End | West Pond

Twitchell Alfalfa: 2015-11-11 13:00:00 (DOY 315)
Author: Joe Verfaillie
Others: Kyle

Summary: Swapped main batteries, lots of squirrel activity, troubleshooting diffuse PAR.

Alfalfa
2015-11-11

I arrived about 1pm with Kyle. It was clear, sunny and mild with a light variable breeze. The road was muddy. We drove on the field in the wheel tracks of other vehicles. The field is the same – no new mowing. The mowed strip near the tower had some lush new growth, except near our tower where the ground squirrels have grazed it to stubble. We saw about five squirrels disappear down holes as we approached. I filled in a bunch of their holes near the tower again.

I swapped out the batteries at the tower with brand new ones. The tower has been losing 30-50% of its data each day. One pair of batteries was relatively new, 2012.

The 7500 read: 409.91ppm CO2, 465.4mmol/m3 H2O, 95.6SS, 19.84C, 103.0kPa

Very few images on the camera due to the power outages.

Kyle did the soil respiration using a battery we brought along. He also did spectral measurements.

I added a CFM sn 6763 to the met CR1000 to collect the high frequency diffuse PAR data, since the calculated minimums don’t seem to be working all the time. I think there is a problem with the way the calculations are done, but I don’t have a test sensor in the lab. I did change the CR1000 program to fix some bugs in the counters I am using as a diagnostic.

1 photos found

Mowing
TA_autocam_20151112_1145.jpg ( 2015-11-12 11:45:03 ) Full size: 1920x1440
Mowing

Graphs display:
7 sets found

Can't check TA_met
11 TA_met graphs found

Alfalfa Temperatures

Alfalfa Soil Heat Flux

Alfalfa Soil Moisture

Alfalfa Soil Temperatures Set A

Alfalfa Soil Temperatures Set B

Alfalfa Soil Temperatures Set C

NDVI Narrow Band Radiation

Soil CO2 Flux

Relative Humidity and BattV

SRS NDVI and PRI

PRI Narrow Band Channels

Can't check TA_rad
3 TA_rad graphs found

Alfalfa Radiation

Alfalfa LED NDVI Sensor

Alfalfa PAR

Can't check TA_flux
5 TA_flux graphs found

Alfalfa Sonic Wind

Alfalfa CO2 and H2O

Alfalfa Methane

Alfalfa Pressure

Alfalfa Flux Data Counts

Can't check TA_soilco2
7 TA_soilco2 graphs found

Set A Soil CO2

Set B Soil CO2

Soil CO2 Soil Moisture

Forced Diffusion CO2

Alfalfa Forerunner Soil CO2

Alfalfa Forerunner Temperatures

Alfalfa Forerunner Probe RH

No data found for TA_arable.
1 TA_cam graphs found

GCC

Can't check TATWBABCSB_cam