Field Notes

Bouldin Alfalfa: 2017-07-12 09:33:00 (DOY 193)
Author: Ada Chang
Others: Dennis Baldocchi, Sam Chamberlain, Daphne Szutu

Summary: Regular data collection/cleaning, clip plots, veg height measurements, Attempted spectrometer and LAI measurements.

Arrived at 9:33. The weather was sunny, clear and cool. Four-way sensor was very dirty. Tipped precipitation bucket at 10:50 and cleaned it. Collected USB MET CAM.

LI7500 readings:
CO2 387 -> 398
H2O 629 -> 639
T 22.7
P 101.32
SS 96.2 -> 100.3

Took spectrometer data. Conditions were perfect and clear. Took data by performing a reference and dark measurement and then five down-up readings. Then the reference/dark reading was repeated with another five down-up readings. The procedure might have been swapped on the first or third samples, so those would be up-down. However, the readings were taken by hitting the â€œSAMPLEâ€ button, not the â€œSAVEâ€ button, so the data may not have been saved.

Took biomass samples using the 1600 cm2 clip plot and recorded sample heights. Took vegetation height measurements

Sample Heights:
Sample 1 â€“ 37 cm
Sample 2 â€“ 41 cm
Sample 3 â€“ 57 cm
Sample 4 â€“ 43 cm
Sample 5 â€“ 36 cm

Vegetation Height (cm):
39, 33, 43, 45, 37, 39, 47, 31, 38, 38, 28, 38, 32, 38, 35, 40, 32, 46, 36, 40

Attempted to collect LAI data, but machine showed zero-values consistently.

Left at 10:18.

Next Mowing: 2017-07-24

Veg Height (cm): Tape measure from ground to top of plant
39, 33, 43, 45, 37, 39, 47, 31, 38, 38, 28, 38, 32, 38, 35, 40, 32, 46, 36, 40, avg = 37.8, stdev = 5.07

0 photos found

7 sets found

5 BA_flux graphs found