Field Notes

When: Feb 28, 2002
Where: Tonzi/Vaira Ranches
Who: Liukang Xu
Weather: Sunny, growing grass, warm, air temperature in the afternoon is over 20^oC

Around 10:00 arrived at Tonzi;

At Tower:

1. The tower flux system was running, Download flux data;

2. the Voltage regulator reading (13.2 V, 9.1A, and 2.1A). Battery charger indicator was low. Replaced battery for CR23X at the top of the tower, adjusted the angle of solar panel at the top of the tower from 30^o to 45^o. After I adjusted, the output current increased by more than 2 A.

At Floor:

1. Replaced battery for the watchdog CR10 data-logger at floor flux system, flux system was running, Voltage regulator reading (at 10:55 am; 13.3 V, 8.9 A and 1.9 A), charger indicator was half full.
2. Adjusted the angle of solar panel at floor system to 45^o.
3. Replaced Li-Cor 7500s: sn 0041 came off and sn 0042 went on and download flux data.

At the met station;

1. Replaced battery for the two data logger (CR10x and CR23x)

Took Moisture Point Soil Measurements: The data in the following table are averaged from 3 measurements

Dendrometer reading

Took 15 grass height measurements (m=4.3 cm std=1.4 cm).

Arrived at Vaira around 14:35; The grass has been growing lot since my previous visit (Feb 12).

1. Replaced li-Cor 7500s: sn 0065 came off and sn 0035 went on, download flux data.
2. Voltage regulator reading 13.9 V, 9.8 A and 2.4 A. replaced battery for the two data logger (CR10X and CR23X).
3. Adjusted solar panel angle to 45^o. Check electric fence.
4. took 3 LAI samples
5. grass height measurement (samples=16, m=6.1 cm, std=1.7 cm)