Field Notes

Bouldin Alfalfa: 2019-10-02 10:25:00 (DOY 275)
Author: Daphne Szutu
Others: Camilo, Ariane

Summary: Regular data collection/cleaning, field has been mowed, spectral, veg height, removed upper/lower HMP sensors

2019-10-02
Bouldin Alfalfa

Camilo, Ariane, and I arrived at 10:25 PDT. It was a sunny, clear, and breezy day. The alfalfa has been mowed and the bales have been removed. The field has thin strips of light-green alfalfa, which were probably under the hay piles.

Ariane took spectral measurements over the dark-green patches of alfalfa. She also took veg height measurements. I downloaded met, camera, USB GHG, and FD data. The wash reservoir was mostly full; we topped it off. The upper HMP still has nighttime drop-outs of air temperature and generally RH messiness, so we decided to remove the two HMPs we had set up for Camiloâ€™s boundary-layer questions. Camilo cleaned flux and rad sensors and measured the sonic orientation.

Sonic sn 153806, Magnetic N 235 degrees
Upper HMP, sn G4540023, z=560 cm
Lower HMP, sn L1740398, z=73 cm

LI-7500 readings:
CO2 428ppm
H2O 550ppm
T 18.1C
P 101.7kPa
SS 96--> 102 after cleaning
LI7700 readings:
CH4 2.1ppm
RSSI 55-->83 after cleaning

We left at 11:15 PDT.

Next Mowing: 2019-10-18

Veg Height (cm): Tape measure from ground to top of plant - Measured by AAO
18, 19, 20.5, 23.5, 24, 21, 21, 22.5, 20.5, 29, 20, 21, 27, 30, 22, 27, 24, 26, 21.5, 26.5, avg = 23.2, stdev = 3.38

2 photos found

20191002BA_LightGreenStrips.JPG ( 2019-10-02 11:15:28 ) Full size: 1920x1440
Light-green strips of alfalfa on the field, probably where the windrows (rows of cut hay) were stacked up.