Field Notes

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Other sites visited today: East End | Mayberry | Twitchell Rice | West Pond
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Twitchell Alfalfa: 2015-10-29 11:30:00 (DOY 302)
Author: Joe Verfaillie
Others: Sara

Summary: Field still half mowed, no power for spectrometer or LI-6400, squirrels active, low voltage power outages.

Alfalfa
2015-10-29

I arrived about 11:30 with Sara. It was mild and windy with a clear blue sky. The field is the same as last time, half mowed, half un-mowed. The mowed area is almost as tall as the un-mowed area. The un-mowed half is near the tower so we did not clip around the ground instruments.

The battery in the spectrometer was dead and we forgot to bring a battery for the 6400. I tried to hook up the 6400 to the power at the soil CO2 box, but it seemed to keep browning out. Iâ€™ll have to test it in the lab.

Sara did veg height.

The 7500 read: 381.79ppm CO2, 419.2mmol/m3 H2O, 93.2SS, 24.47C, 101.39kPa

The ground squirrels are active. They chewed the lead for the 6400 power. I cut it off the batteries. I put some mothballs in the squirrel holes and filled them with dirt.

The diffuse PAR was running, but the minPar in the data logger looked too high. Iâ€™ll look at the data but I might have to change the sampling frequency.

The system seems to have been having low power for the last week. The batteries probably need to be swapped.

Veg Height (cm): Tape measure from ground to top of plant
31, 40, 43, 50, 48, 47, 40, 39, 49, 58, 47, 40, 43, 51, 50, 52, 50, 30, 45, 50, avg = 45.2, stdev = 6.98

1 photos found

20151029TA_FRSoilCO2.jpg ( 2015-10-29 11:41:53 ) Full size: 1920x1440
Forerunner soil CO2 probes buried in the ground