This will be my template for this round of soil sample processing.
A few notes:
- We forgot to pack the scale, so ours is being sent. In the meantime, I've borrowed one (generously loaned by John H) with a resolution of 1g. When our scale arrives, I'll make a few parallel measurements to compare the two scales.
- We couldn't find any good foil cups at the store today to bake the dirt in, so I've made some by bending aluminum foil. Obviously, they won't tare as consistently as store-bought.
- The coring tool was set up with two 3cm rings on the top (used) followed by two 1cm rings on the bottom (ignored). Thus, each 3cm sample volume was 3*pi*(5.31/2)^2=66.4cm^3.
Site/Time |
Depth |
ID |
Tare(g) |
Wet(g) |
Dry(g) |
Rho-dry (g/cm^3) |
Qsoil (% mass) |
Volume fraction (%) |
Comments |
|---|---|---|---|---|---|---|---|---|---|
|
|
|
|
|
|
|
(wet-dry)/wet |
(wet-dry)*rho_water/vol |
|
1 |
0-3 |
2-0 |
3.5 |
73 |
47.9 |
0.67 |
36 |
37 |
|
5Jan 0950 |
3-6 |
2-6 |
3.7 |
123 |
101.9 |
1.48 |
18 |
32 |
|
2 |
0-3 |
3-0 |
3.3 |
90 |
74 |
1.06 |
18 |
24 |
Soil damp&sticky |
4Jan1410 |
3-6 |
3-6 |
3.6 |
129 |
121 |
1.77 |
6 |
12 |
Piece of brick |
3 |
0-2.5 |
1-0 |
3.4 |
89# |
68 |
1.17 |
25 |
38 |
Only ~2.5cm thick |
3Jan1500 |
2.5-5.5 |
1-6 |
3.4 |
148# |
124 |
1.82 |
17 |
36 |
|
4 |
0-3 |
2-0 |
3.5 |
152# |
122 |
1.78 |
20 |
45 |
|
3Jan1636 |
3-6 |
2-6 |
3.7 |
137# |
115 |
1.68 |
17 |
33 |
|
5 |
0-3 |
1-0 |
3.4 |
103 |
87.2 |
1.26 |
16 |
24 |
|
5Jan 1445 |
3-6 |
1-6 |
3.4 |
99 |
89.9 |
1.30 |
10 |
14 |
|
6 |
0-4 |
1-0 |
3.4 |
97.4* |
61.4 |
0.66 |
38 |
41 |
Soil was frozen, |
6Jan 1012 |
4-6 |
1-6 |
3.4 |
72.2 |
58.0 |
1.23 |
21 |
32 |
so odd depths (approx) |
7 |
0-3 |
2-0 |
3.5 |
40.9* |
23.75 |
0.30 |
46 |
26 |
|
6Jan 1140 |
3-6 |
2-6 |
3.7 |
77.4 |
59.4 |
0.84 |
24 |
27 |
|
# = weighed wet a day later (but kept cold to reduce water loss)
* = weight after a bit of time in the oven :( [forgot to write down first reading], water content will be a bit low, but dry density will be okay
Here is a quick comparison of the weights of various objects with the borrowed scale and ours. The borrowed scale read within 1g, so I wouldn't change any of the above readings.
Ours (g) |
Borrowed (g) |
|---|---|
3.6 |
3 |
3.3 |
3 |
48.5 |
49 |
85.1 |
85 |
116.3 |
117 |
145.2 |
146 |
ROUND TWO:
Warmer temperatures have both melted snow (and there has been rain) to increase moisture and liquified existing moisture to allow the EC-5s to measure it.
Site/Time |
Depth |
ID |
Tare (g) |
Wet (g) |
Dry (g) |
Rho-dry |
Qsoil |
Volume Fraction |
Comments |
|---|---|---|---|---|---|---|---|---|---|
|
|
|
|
|
|
|
|
|
|
1 |
0-3 |
1-0 |
3.4 |
135.6 |
107.3 |
|
|
|
|
17 Jan 0835 |
3-6 |
1-6 |
3.5 |
163.3 |
138.4 |
|
|
|
May have been compressed |
2 |
0-3 |
4-0 |
3.6 |
92.0 |
|
|
|
|
a bit frozen |
18 Jan 0828 |
3-6 |
4-6 |
3.8 |
96.3 |
|
|
|
|
|
3 |
0-3 |
2-0 |
3.6 |
69.5 |
38.5 |
|
|
|
grass |
17 Jan 1010 |
3-6 |
2-6 |
3.7 |
138.3 |
111.1 |
|
|
|
|
4 |
0-3 |
|
|
|
|
|
|
|
|
|
3-6 |
|
|
|
|
|
|
|
|
5 main |
0-3 |
3-0 |
3.3 |
113.1 |
82.8 |
|
|
|
water (frozen) |
17 Jan 1120 |
3-6 |
3-6 |
3.6 |
112.1 |
89.5 |
|
|
|
|
5 aux |
0-3 |
4-0 |
3.6 |
124.8 |
105.2 |
|
|
|
|
17 Jan 1132 |
3-6 |
4-6 |
3.8 |
120.1 |
104.8 |
|
|
|
|
6 |
0-3 |
|
|
|
|
|
|
|
|
|
3-6 |
|
|
|
|
|
|
|
|
6 aux |
0-3 |
|
|
|
|
|
|
|
|
|
3-6 |
|
|
|
|
|
|
|
|
7 |
0-3 |
5-0 |
3.8 |
90.9 |
48.7 |
|
|
|
water (frozen) |
17 Jan 1221 |
3-6 |
5-6 |
3.4 |
112.4 |
82.6 |
|
|
|
water |