Field Notes

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Other sites visited today: Hill Slough | Bouldin Alfalfa | West Pond
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Bouldin Corn: 2021-08-25 11:35:00 (DOY 237)
Author: Daphne Szutu
Others: Joe

Summary: Biomass samples, re-wired barometer

2021-08-25
Bouldin Corn

Joe and I arrived at 11:35 PDT. It was warm and sunny with a bit of a breeze. Today was a maintenance trip. The bottom leaves of the corn are starting to dry out, and some of the corn cobs are getting so heavy theyâ€™re falling away from the stalk and pointing silk side down.

Joe took 5 corn biomass samples to calculate our total biomass of the season.

I inspected the barometer because it had been inconsistent against the GHG pressure data, and we expect the 2 pressures to have a consistent linear relationship. The barometer was wired as a DE measurement on the mux but programmed as a SE measurement, which may explain its inconsistent performance. I re-wired the barometer to the datalogger and changed the program to use a VoltDiff command. After sending the new datalogger program, the air pressure was 101.5 kPa, which matched the GHG air pressure.

I downloaded met, camera, and USB GHG data. I downloaded PA data and power cycled it. I skipped downloading the IRT and FD data since weâ€™ll get those next week with the regular data collection visit. I topped off the wash reservoir and cleaned the flux and rad sensors and the inside of the phenocam enclosure. The camera view may have changed slightly.

LI-7500 readings:
CO2 397ppm
H2O 670ppm
T 23.5C
P 101.5kPa
SS 101.8-->103 after cleaning
LI7700 readings:
CH4 1.99
RSSI 65-->80 after cleaning

We left at 12:20 PDT.

Veg Height (cm): Tape measure from ground to top of plant - Biomass samples measurements
295, 295, 277, 274, 242, avg = 276.6, stdev = 21.69

0 photos found

6 sets found

17 BC_met graphs found