Field Notes

<--2020-06-04 08:00:00 | 2020-06-15 00:00:00-->
Other sites visited today: West Pond | East End | Bouldin Alfalfa
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Bouldin Corn: 2020-06-09 12:50:00 (DOY 161)
Author: Joe Verfaillie
Others: Daphne

Summary: Furrowing done today, biomass/LAI samples, standard data collection, swapped broken shadow band motor, one FD chamber not working, remounted moved Arables, one-day power outage over the weekend

Bouldin Corn
2020-06-09

Daphne and I arrived at 12:50. It was clear, sunny and hot with a few cirrus clouds and a light variable breeze. We could see tractors working nearby fields and I saw one in the field directly to our north when I went passed on my way to Bouldin Alfalfa. We could see where the tractor had worked our field â€“ some small areas were the corn had been run over and fresh furrows. The patch of high density volunteer corn is slightly taller, a little lighter green and maybe has thinner more pointy leaves. Some corn near the corner of the field looked a little water stressed.

I did spectra and veg height. Daphne collected the tower data.
The 7500 read: 390ppm CO2, 360mmol/m3 H2O, 29.0C, 101.4kPa, 98SS
The 7700 read: 2.0ppm CH4, 41RSSI â€“ 88 after cleaning

I swapped the diffuse PAR motor which had failed. I sprayed the exposed motor hub with WD-40.

The PurpleAir microSD card was empty but the unit was running. Daphne reinstalled the card directly in the slot removing the extension cable â€“ we will need a pointy tool to remove the card next time. And I should have a new adapter next time as well.

Daphne collected the FD chamber data and cleared their memories. However sn FD20180047 was not responding. She swapped cables - 47 still didnâ€™t work and the other one still worked with 47â€™s cable. The body of 47 was warm to the touch. We put it in the shade for a while to see if it would cool off and restart but no luck. We brought it in for a try in the lab. I added tie downs to the chamber that was missing two.

I added a new 3ft cross bar to the Arables to separate them more because they seemed to be interfering with each otherâ€™s telecommunications. I also moved them further out into the field since the tractor work seems to be done. This gets them away from the non-typical, high density volunteer corn area and into a more typical area. Both Marks were reporting solid green status. They are 3.6m above the ground.

I took five individual plants for biomass measuring planting density again. I donâ€™t think we need to do the density measurements much more as these number are essentially the same as last time.
Row separation: 77, 72, 74, 76, 78, 79, 77, 78, 76, 75, 77, 86 = 77.1cm on average
Plants in 4m: 27, 25 = 6.5 plants per meter.

Daphne did one-wand LAI. File BC0609 has below measurements in line with the corn rows between two adjacent plants. File BC0609-2 has pairs of below measurements one on either edge (drip line) of a corn row.

Daphne downloaded the picam images and cleared their memories. She also dusted off the lenses.

We left at 14:25.

Looking at the data back in the lab, looks like there was a power outage for about 22 hours, from 2020-06-06 16:30 to 2020-06-07 14:00. We are missing flux, cam, and met data from this time period. When the power came back up, it conveniently restarted the NDVI and PRI sensors that had been hung up.

Veg Height (cm): Tape measure from ground to top of plant - Furrowed today soil piled around base of plants
76, 90, 95, 80, 86, 82, 86, 78, 82, 94, 93, 90, avg = 86, stdev = 6.45

0 photos found

6 sets found

17 BC_met graphs found