I just added a spare Qsoil to base in a plot that I will water. My goal is to characterize the behavior of an EC-5 probe in this soil with high iron content. Hopefully, it will still have a slope of 1, but just an offset. Although the soil structure changes a bit from site-to-site here, the iron content appears (based on my magnet test) to be about the same at base as at near, so I am optimistic that these test results will be relevant to the other sites.
Probe is ECHO005/PIC015.
The plan is simply to water this plot to field capacity and watch it dry out, while taking gravimetric samples regularly -- at least daily.
15:00 took the first sample (still before wetting; soil was a little bit moist). I'll just measure the 3-6cm ring, as being close to the location of the EC5 (volume = 3*pi*(5.31/2)^2 )
10/25: 09:35 First watering. Water ponded. I'll wait a bit and reapply.
09:45 Second watering. EC5 still hasn't seen it.
10:00 Water #3. EC5 still hasn't seen it.
10:15 Water #4. EC5 noticeably rising.
10:45 Water #5. EC5 up quite a bit.
11:05 Water #6.
11:15 Water #7. I'll stop here.
11:40 EC5 beginning to flatten out.
Date |
Time |
Tare |
Wet |
Dry |
Rho |
Grav% |
Vol% |
EC-5 |
|---|---|---|---|---|---|---|---|---|
10/24 |
15:00 |
2.4 |
84.3 |
77.8 |
1.14 |
8.3% |
9.5% |
9.5% (EXACT!) |
10/25 |
13:30 |
8.2 |
129.0 |
111.0 |
1.55 |
17.5% |
27.1% |
20.3% |
10/25 |
16:45 |
8.2 |
117.0 |
102.8 |
1.42 |
15.0% |
21.4% |
18.6% |
10/26 |
11:00 |
8.2 |
108.3 |
98.1 |
1.35 |
11.3% |
15.4% |
17.1% |
10/27 |
09:15 |
8.2 |
102.6 |
92.9 |
1.27 |
11.5% |
14.6% |
14.2% |
10/27 |
13:25 |
8.2 |
128.8 |
115.2 |
1.61 |
12.7% |
20.5% |
15.7% |
10/28 |
16:30 |
8.2 |
141.0 |
126.7 |
1.78 |
12.1% |
21.5% |
14.2% |
10/29 |
15:20 |
8.2 |
109.3 |
98.3 |
|
|
|
13.3% |