Field Notes

Bouldin Corn: 2022-03-31 11:50:00 (DOY 90)
Author: Daphne Szutu
Others: Joe

Summary: Regular data collection/cleaning, tilling neighboring field--moved soil sensors and PL Arable out of the field, swapped PL Arable, dfPAR motor not working--brought back to lab

2022-03-31
Bouldin Corn

Joe and I arrived at 11:50 PDT. It was mild with high thin clouds and a strong breeze from the west. They were tilling the field south of us so Joe dug out our soil sensors and reinstalled them under the tower (using the FD chamber garden stake as a pilot rod). After installation, the Theta prove was reading a negative number. Joe re-did the sensor connector and it read ~800 mV as expected.

Position, serial number, and depth of sensor from soil surface to top of tines
North, sn 17129, 10cm
Mid, sn 17133, 20cm
South, sn 17128, 15cm
(Theta probe), sn M003370, at surface

He also moved the PL Arable back to the edge of the field so it’s about 20m north of our tower. He swapped the Arable: sn C004318 came off and sn C011081 went on. The old Arable had some gaps.

The dfPAR motor was broken. Joe got the motor to work for about ½ a revolution with some WD-40, but then it stopped again. We brought the motor and shadow band back to the lab. The shadow band needs a new set screw because I dropped the old one from the tower.

I downloaded met, cam, and USB GHG data and cleaned flux and rad sensors. I downloaded the PA data and power cycled it. I downloaded the IRT data by swapping the microSD card and using CardConvert to convert the fast data to TOB1 and the slow data to TOA5.

LI-7500 readings:
CO2 413ppm
H2O 380ppm
T 19.1C
P 101.4kPa
SS 102 --> didn’t clean
LI7700 readings:
CH4 1.98ppm
RSSI 40 --> 79 after cleaning

We left at 13:10 PDT.

1 photos found

bouldincorn_2022_04_01_094506.jpg ( 2022-04-01 10:46:26 ) Full size: 1296x960
Tractor tilling the field