Field Notes

Twitchell Alfalfa: 2016-09-13 09:50:00 (DOY 257)
Author: Elke Eichelmann
Others: Kyle Hemes, Dennis Baldocchi, Isabella Reche

Summary: Low power so some data missing, alfalfa getting tall, normal data collection

Arrived 9:50. Clear, sunny, slight breeze, hazy. Alfalfa is getting tall, starting to bloom, will probably be cut soon, really chewed down by caterpillars in some places. Lots of butterflies in the field. Lots of bird poop around the tower and on solar panels.

Collected USB GHG data; collected met data from CR1000; collected rad data from CR10X, box was not running only got data from DOY 244 to 246 probably due to low power; collected camera card: swapped CF card â€œTAâ€ in and â€œTAâ€ out; collected soil CO2, STC(14)=NAN. Had some trouble turning off the camera, had to hold down the button for awhile, only have pictures up to September 8, 6:45.

Battery volt 11.9, solar panels really dirty, maybe we lost power overnight?

Dennis did spectral measurements, Kyle did soil respiration: collar 6 was unable to pump down to limit.

Filled in holes from ground squirrels.

LI7500 readings
CO2 374.41
H2O 578.8
T 16.91
P 101.11
ss 83.78 -> 86.65 after cleaning

left: 10:45

Veg Height (cm): Tape measure from ground to top of plant - Flowering, lots of butterflies, soon to be cut
32, 32, 24, 29, 30, 40, 44, 39, 39, 34, 43, 38, 35, 49, 38, 20, 39, 10, 42, 38, 40, 42, 42, avg = 35.6, stdev = 8.67

2 photos found

twitchellalfalfa_2016_09_13_101604.jpg ( 2016-09-13 08:22:00 ) Full size: 1296x960
Isabel, Elke, Kyle