Field Notes

Bouldin Corn: 2018-01-31 11:55:00 (DOY 31)
Author: Daphne Szutu
Others: Elke, Kyle, Rory French

Summary: Regular data collection/cleaning, properly mounted 7500, mux sensors all have problems, skipped BA because of spraying

2018-01-31
Bouldin Corn

We arrived at 11:55. It was sunny and warm with thin clouds. There is water in the field, but less than last time and it looks like it is draining away.

As we were leaving BC around 12:30, we saw them spraying near our alfalfa fields, so we didn't go to BA this day.

Kyle cleaned radiation and EC sensors, put bird spikes on the 7500, and put the 7500 on the regular Licor mount. He refilled the wash reservoir; it was 4/5 full.

I collected met and USB GHG data. I thought I swapped the camera card, but the card I brought back was empty, so maybe I forgot to swap the cards. There was a clock sync error between the 7550 and the 7700. I set the 7700 clock from slave to automatic setting and reset the box; this fixed the time sync error.

LI-7500 readings:
(temporary mount --> cleaning + regular mount)
CO2 440 ppm --> 437
H2O 480 mmol/m3 --> 558
T 16.8 C --> 18.4
P 101.4 kPa --> 101.4
SS 90 --> 101

LI7700 readings:
CH4 2.36 ppm --> 2.36 after cleaning
RSSI 54 --> 73 after cleaning

There were many problems with the met data, especially the sensors wired to the multiplexer: SHF plates were NAN, atm pressure had spikes downward, AirT ~34 deg C, 4-way radiometers had spikes, and PAR were NAN. I cycled power on the datalogger. This did not fix the problems. I checked the wiring between the mux and datalogger. The sensors came back online after I re-wired the COM ODD wires on the mux.

We left at 12:30.

2 photos found

bouldincorn_2018_01_31_134505.jpg ( 2018-01-31 13:50:40 ) Full size: 1296x960
Tyler, Heather working on chambers