Field Notes

Twitchell Alfalfa: 2014-03-27 14:20:00 (DOY 86)
Author: Cove Sturtevant
Others: Patty

Summary: Regular field work. Swapped 7500. Swapped out rad tower solar controller. Removing 7700 from logging did not fix extra 9999 columns. Reflected PAR sensor covered with eggs.

Twitchell Alfalfa
2014-03-27

We arrived about 14:20 PST It was overcast, cool, and calm-ish. Alfalfa growing steadily. I downloaded data and did other tower maintenance while Patty did spectral, veg height, and clip plots.

I swapped out the 7500 for a freshly calibrated one (removed sn 0065, installed sn 75H-2180), adjusting the pressure cal in the 7550. I also swapped out the solar controller on the radiation tower because the power has been funky. We shall see if it corrects the problem.

I removed the 7700 from the logging but after checking the data file the extra 9999 columns were still present. Not sure the fix for this issue.

7500 readings:
CO2 = 392 ppm (400 after cleaning, 400 after swap)
H2O = 470 mmol m-3 (480 after cleaning, 480 after swap)
SS = 79.2% (79.65% after cleaning, 94.0% after swap)
sos = 344.4 m s-1

Cleaned radiation sensors. There were insect eggs completely covering the reflected PAR sensor. Yucky.

Veg Height (cm): Tape measure from ground to top of plant
34, 34, 32, 34, 20, 37, 40, 20, 40, 35, 36, 43, 32, 28, 33, 15, 30, 27, 35, 29, avg = 31.7, stdev = 7.07

1 photos found

TA_autocam_20140327_1415.jpg ( 2014-03-27 14:15:02 ) Full size: 1920x1440
Patty and Cove doing fieldwork