Field Notes

<--2016-04-28 12:50:00 | 2016-05-17 09:15:00-->
Other sites visited today: Twitchell Rice | West Pond | East End | Mayberry
Phenocam link: Searching...

Twitchell Alfalfa: 2016-05-12 11:35:00 (DOY 133)
Author: Elke Eichelmann
Others: Kyle Hemes, Tyler, Joe

Summary: Regular data collection; did spectral, soil respiration, and clip plots; started to reorganize the soil sensors

Arrived at 11:35. Sunny, breezy, mostly clear skies, but some high thin sparse clouds.

Joe arrived a little earlier, started to put some of the soil sensors in conduit, also moved the first soil heat flux plate from main tower to radiation and soil CO2 measurement location. Also added one theta probe. But none of these are measured by the program yet.

Collected USB GHG data, collected met data from CR1000 (by the GHG tower) directly to the laptop, since we forgot to bring a Compact Flash card to swap, collected camera pictures, collected soil CO2 data, collected radiation CR10X data.

Did spectral measurements.

Did soil respiration measurements.

Took canopy height measurements in cm:
41; 46; 41; 36; 52; 48; 39; 40; 52; 48;

Did four clip plots. We did not bring the right size paper bags to do the clip plots, but found four plastic bags that we used instead.
Sample No Canopy Height (cm) Fresh Weight (g) LAI (cm2)
1; 42; 211.82; 3582.8;
2; 30; 139.82; 2660.67;
3; 25; 112.03; 1889.19;
4; 41; 182.54; 3496.94;

LI7500 readings:
CO2 372.91
H2O 733.8
T 19.76
P 101.47
SS 91.69 -> 95.73 after cleaning

Left at 13:00

Veg Height (cm): Tape measure from ground to top of plant
41, 46, 41, 36, 52, 48, 39, 40, 52, 48, avg = 44.3, stdev = 5.64

2 photos found

TA_autocam_20160512_1145.jpg ( 2016-05-12 11:45:02 ) Full size: 1920x1440
Elke, Tyler and Kyle on site