4 io 
Journal of Agricultural Research 
Vol. I, No. s 
better drained and less saline soil than the species of Salicornia. In 
places, however, it is seen scattered over the surface of the flats, the 
dark brownish green 
tufts of Allenrolfea 
contrasting strikingly 
with the pure white of 
the saline incrustation. 
The thinness of the 
stand is shown in fig¬ 
ure 12, which repre¬ 
sents a typical io- 
meter quadrat. Often, 
as shown in Plate 
XLVIII, figure i, Al¬ 
lenrolfea forms a pure 
community. On high¬ 
er and better drained 
ground, however, it is 
frequently associated 
with Sarcobatus vermi- 
culatus and with Sua - 
eda moquinii } while in 
the wetter depressions 
Fig. i2.—A representative 10-meter quadrat of the Allenrolfea com¬ 
munity (salt-flat association), showing the location of each individual 
plant of Allenrolfea occidentals, the only species present. 
it often mingles with Salicornia utahensis . Plants of greasewood, when 
growing with Allenrolfea, are usually stunted and sickly looking. 
Physical Conditions Indicated. —The conditions as to soil moisture 
and salt content at all borings where Allenrolfea occurred are given in 
Table XVT. 
Table XVI .—Allenrolfea community: Moisture conditions and salt content of the soil in 
typical areas . 1 
Item. 
Depth 
of soil 
(feet). 
Date of collection. 
June. 
July. 
j Aug. 
29 6 
Aver¬ 
age. 
No. of sample. 
64 
76 
80 
81 
82 
84 
97 
Moisture equivalent. 
Wilting coefficient.. 
Moisture content 
above or below the 
wilting coefficient. 
Salt content. 
,98 
3 1, 1 
37-4 
27.9 
26. o 
16.9 
20. 3 
IS-1 
14.1 
+ 3-5 
+ 12. 3 
+ 6.9 
+ 4-3 
2.18 
2. 08 
1. 64 
x. 24 
28. 4 
17 - 1 
19.4 
36.1 
IS -4 
9-3 
10. 5 
19. 6 
+ 8.9 
+ 6.9 
- 1-3 
- 4 - S 
2. 30 
1. 64 
1. 36 
I. 16 
25-5 
25 - 6 
26. o 
30. 2 
13-9 
13- 9 
14- I 
16. 4 
- 2.0 
- .8 
- 2. 9 
‘ 7-3 
• 25 
. 26 
. 19 
•44 
24.4 
19-3 
17-3 
26. 7 
13 - 2 
13*2 
10. s 
9.4 
14 - 5 
7. 2 
+ 8. o 
+ 8.6 
+ 9-7 
1.36 
1.24 
a- 30 
1. 8 S 
1.36 
.88 
.88 
i- 36 
.91 
. 98 
.98 
24. 6 
28. 2 
18. s 
29 - S 
13-4 
IS -3 
10. o 
16. o 
- 7.2 
- 2. I 
- 5-5 
- 7*7 
. 18 
. 76 
• 76 
2.18 
1. 8 S 
26. 7 
23-4 
21.8 
30*4 
14 - S 
12. 7 
11. 8 
16.5 
+2. 2 
+6.1 
+ 4 - 7 
+ 3-7 
1. 26 
1.11 
i -13 
-94 
1 All data in this table are stated in percentages of the dry weight of the soil. The moisture contents 
with a plus sign (+) represent moisture available for growth (above the wilting coefficient), while those 
with a minus sign (—) represent a corresponding deficit of available moisture (below the wilting coefficient). 
