Field Notes
<--2019-07-11 07:30:00 | 2019-08-07 14:10:00-->Other sites visited today: Bouldin Alfalfa | West Pond | East Pond
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Bouldin Corn: 2019-07-26 07:30:00 (DOY 207)
Author: Daphne Szutu
Others: Camilo, Katrina
Summary: 6400 measurements, regular data download/cleaning, LAI, veg height, knocked down wasps' nest
| 2019-07-26 Bouldin Corn Camilo, Katrina, and I arrived at 7:30. It was a sunny and mostly clear day. It was mild when we arrived but warmed up to 32 degC. The corn is green and > 2m tall. We were able to drive through the red gate by the overpass. Camilo and Katrina worked on LI-6400 measurements. Their two chambers were set up under the radiometers. We used line power with one chamber and the other chamber used two 9-cell batteries over the day. They measured ACi curves over a range of CO2 concentrations and light-response curves (LRC) over a range of light levels with a saturating flash of light. Four A/Ci curves and five LRC were measured. One A/Ci curve was measured under 2% O_2 concentration and the other three under regular air passed through the mixer at 400 ppm. Three LRC were measured on the same leaves used for regular A/Ci curves by the same section of the leaf, and two extra LRC were measured on other leaves. Light response curves were done with the Li-6400XT and included measurements of fluorescence. The A/Ci curves were done with the Li-6400 using the 2x3 LED cuvette. I downloaded met, camera, USB GHG, Purple Air, and zcam data. I took 1-wand LAI measurements facing W because the usual tripod was needed for 6400 work. File BC0726 had A/B measurements reversed and A measurements only before B measurements. File BC0726-2 had A measurements before and after B measurements, with 3 logs per row of corn. I cleaned flux and rad sensors, the Arable solar panels and sensors, phenocam window (spiderwebs), and the precip funnel (had a few beetle-shaped exoskeletons). The wash reservoir was mostly full; I topped it off. LI-7500 readings: CO2 389 ppm H2O 674ppm T 22.7C P 100.9kPa SS 96--> 98 after cleaning LI7700 readings: CH4 1.9ppm RSSI 32-->85 after cleaning We left at 13:40, but stopped by briefly at 14:40 after leaving BA to knock down a wasp's nest under the upper boardwalk (we had noticed it earlier but forgot to knock it down). |
Veg Height (cm): Tape measure from ground to top of plant - Measured by DS
256, 266, 247, 255, 247, 237, 250, 258, 260, 267, avg = 254.3, stdev = 9.26
6 photos found
20190726BC_SpudDitch.JPG ( 2019-07-26 10:46:29 ) Full size: 1440x1920
Spud ditch in the corn field
20190726BC_O2tank.JPG ( 2019-07-26 11:50:15 ) Full size: 1440x1920
One A/Ci curve was measured under 2% O_2 concentration
20190726BC_Katrina.JPG ( 2019-07-26 11:09:55 ) Full size: 1440x1920
Katrina running 6400 measurements among the corn plants
20190726BC_6400LeafFluorometer.JPG ( 2019-07-26 11:47:15 ) Full size: 1920x1440
Measuring a leaf using the 6400 with an opaque chamber
20190726BC_6400LeafChamber.JPG ( 2019-07-26 11:46:19 ) Full size: 1440x1920
6400 leaf chamber
20190726BC_6400chambers.JPG ( 2019-07-26 11:49:32 ) Full size: 1440x1920
6400 leaf chamber
6 sets found
17 BC_met graphs found
5 BC_flux graphs found
Can't check TATWBABCSB_cam
Can't check MBSWEEWPBCBA
2 BC_pa graphs found
1 BC_arable graphs found