Field Notes

Twitchell Alfalfa: 2017-04-27 10:35:00 (DOY 117)
Author: Daphne Szutu
Others: Sam Chamberlain

Summary: Regular data collection/cleaning, veg height

2017-04-27
Twitchell Alfalfa

We arrived at 10:35. It was mostly sunny and breezy. The alfalfa are taller than before so it looks more dominant than the grass. Previously, it looked like a mix of alfalfa and grass, and now it looks like mostly alfalfa.

Sam took soil respiration measurements. We cleaned the radiation and 7500 sensors. I took veg height measurements, which were a mix of alfalfa and grass.

I collected the met, soil CO2 and USB GHG data and swapped the camera card. LED sensors have intermittent NANs. LED(1) is about half NANs. I checked the mux wiring and the sensor cables and they look okay.

LI7500 readings:
CO2 398.5 umol/mol
H2O 486.9 mmol/m3
T 19.1 Celsius
P 101.8 kPa
SS 90.6 -> 92.3 after cleaning

We left at 11:05.

Veg Height (cm): Tape measure from ground to top of plant - mix of alfalfa and grass
57, 53, 50, 52, 55, 46, 49, 51, 70, 65, 44, 65, 72, 50, 58, 45, 57, 37, 54, 45, avg = 53.8, stdev = 9.01

0 photos found

7 sets found

Can't check TA_met
11 TA_met graphs found