Field Notes

Twitchell Alfalfa: 2016-05-24 13:50:00 (DOY 145)
Author: Alison Haddad
Others: Elke Eichelmann

Summary: regular data collection; did spectral, soil respiration, and clip plots.

Arrived at 13:50. Sunny, mostly clear, fluffy clouds on horizon, light wind. Alfalfa about 55cm tall and flowering.

Collected USB data, collected met data from CR1000, collected camera pictures, collected soil CO2 data, collected radiation CR10X data.
Cleaned solar panels.

Did spectral measurements. Light and dark reference every 5 samples. Halfway through, the references and samples took longer to process. This might be due to thin high clouds developing while the data was collected. The spectral data from today should be used carefully.

Did soil respiration measurements.

Took canopy height measurements in cm: 60; 47; 45; 60; 53; 56; 47; 62; 59; 54; 42; 55; 63; 59; 60; 67; 50; 55; 62; 58.

Did five clip plots. Sample No; canopy height (cm); fresh weight (g); LAI (cm2)
1; 65; 206.50; 3513.95
2; 47; 133.28; 2646.35
3; 50; 147.52; 2713.62
4; 58; 189.90; 3892.14
5; 55; 178.12; 3086.46

LI7500 readings
CO2 378.03
H2O 715.3
T 21.67
P 101.59
SS 93.04 ->97.8 after cleaning

Left at 15:21

Veg Height (cm): Tape measure from ground to top of plant - Flowering
60, 48, 46, 60, 53, 56, 47, 62, 60, 55, 43, 56, 63, 59, 60, 67, 51, 55, 63, 59, avg = 56.2, stdev = 6.43

1 photos found

twitchellalfalfa_IR_2016_05_24_144532.jpg ( 2016-05-24 00:00:00 ) Full size: 1296x960
Alison and Elke on site in IR