Field Notes

Twitchell Alfalfa: 2014-10-16 12:45:00 (DOY 289)
Author: Joe Verfaillie
Others: Sara

Summary: Standard data collection, roads passable, added split loom to wires near tower, swapped 7550-7500 cable and pressure port gaskets.

Alfalfa
2014-10-16

I arrived about 12:45 with Sara. It was still and warm with high thin clouds. The road and ditch to the tower was largely dry. There was still some water in the bottom of the ditch along the road. The alfalfa has not been mowed yet and is beginning to flower.

The squirrels chewed on the power line for the 6400. I repaired it and put split loom on most of the wires that are at squirrel level.

Sara did soil respiration, clip plots, LAI, veg height, and spectral.

I collected the data.
The 7500 read: 380ppm CO2, 534.2mmol/m3 H2O, 80.1SS, 24.82C, 101.4kPa.

I swapped the cable between the 7550 box and the 7500A head per Licorâ€™s orders. The 7500 readings did not change after the cable swap. There is also a gasket upgrade to the pressure port of the 7550 box that I did.

There are still a few wasps in the radiation data logger box.

Veg Height (cm): Tape measure from ground to top of plant - Flowering
38, 25, 28, 52, 68, 58, 30, 41, 30, 20, 25, 12, 38, 42, 45, 50, 53, 48, 60, 30, avg = 39.7, stdev = 14.69

1 photos found

TA_autocam_20141016_1145.jpg ( 2014-10-16 11:45:03 ) Full size: 1920x1440
fieldwork