Field Notes

<--2019-10-02 10:25:00 | 2019-10-22 11:10:00-->
Other sites visited today: West Pond | Bouldin Corn
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Bouldin Alfalfa: 2019-10-17 09:50:00 (DOY 290)
Author: Daphne Szutu
Others: Camilo

Summary: Regular data collection/cleaning, 6400 measurements, alfalfa green and lush, biomass samples, veg height, LAI, spectral

2019-10-17
Bouldin Alfalfa

Camilo and I arrived at 9:50 after dropping Ari off at WP for water sampling. It was a mostly sunny, cool, and windy day with scattered clouds. The alfalfa was surprisingly green and lush, but not the tallest Iâ€™ve ever seen. Some of the alfalfa leaves had yellow splotches on themâ€”maybe a nutrient deficiency or mildew problem.

Camilo did 6400 measurements and saw high photosynthesis values again. Five leaves were measured. 5 A/Ci curves and 4 light response curves. The light response curves were done immediately after completing the A/Ci curve. PAR was maintained at 1500 umol m-2 s-1 for the A/Ci curves. CO2 was maintained at 400 umol/mol for the light response curve. Chlorophyll content was measured and leaf was harvested.

I collected met, camera, USB GHG, and FD data. I cleaned flux/rad sensors, the Arables, precip bucket, and solar panels. I topped off the reservoir. I also took 5 clip plot samples and took vegetation height measurements. I did spectral under scattered clouds and 2-wand LAI measurements under a clear sky. The LAI measurements were taken walking N with a 270deg view cap.

I checked the sonic orientation using the lab compass: 235deg magnetic N.

LI-7500 readings:
CO2 427ppm
H2O 628ppm
T 17.1C
P 101.4kPa
SS 94--> 102 after cleaning
LI7700 readings:
CH4 1.97ppm
RSSI 39-->82 after cleaning

I left at 12:20 to service BC and returned at 13:40 to pick up Camilo. The back roads were very dusty. We left at 14:20 to pick up Ari at WP.

Next Mowing: 2019-10-18

Veg Height (cm): Tape measure from ground to top of plant - Measured by DS
40, 32, 44, 41, 46, 26, 48, 27, 48, 39, 51, 41, 41, 51, 51, 50, 27, 33, 33, 33, avg = 40.1, stdev = 8.56

0 photos found

7 sets found

5 BA_flux graphs found