726 
Journal of Agr icultural Research 
Vo 1 . XXVIII, No. 8 
Table III. —Chemical analyses of alkali salts of Tempe, Arizona, sheet a 
Constituent 
4470 
Sec. 9, 
T. 1 N., 
R. 3 E. 
(0-12 
inches) 
Ca___ 
13.32 
Mg... 
4.44 
Na__ 
14.93 
K_ 
2.88 
S0 4 __ 
5. 34 
Cl___ 
56.93 
CO 3 -..... 
HCOs_ 
2.16 
CaS04___ 
7.56 
MgSC>4--. 
MgCla___ 
17.40 
KC1. 
5. 46 
NaCl_ 
35.98 
Na*CO».. 
NaHCOs__ 
2.94 
NaaS04...- 
CaCb... 
30.66 
Per cent soluble salts. 
3.33 
4469 
Sec. 27, 
T. 1 N., 
R. 4 E. 
(0-12 
inches) 
4541 
Sec. 22, 
T. 1 N., 
R. 3 E. 
(crust) 
4468 
Sec. 3, 
T. 1 S., 
R. 4 E. 
(crust) 
4472 
Sec. 3, 
T. 1 S., 
R. 4 E. 
(0-12 
inches) 
0.31 
.31 
34.90 
2.50 
12.16 
46. 38 
.18 
3.28 
1. 07 
1. 52 
6.37 
4.20 
23. 03 
.00 
26.40 
39. 55 
.10 
0.47 
.62 
30.99 
6.40 
9.60 
42.01 
2.34 
7. 57 
1. 56 
3.04 
0.65 
.57 
31. 55 
5.01 
9.76 
41. 73 
1.45 
9.28 
2.18 
2.74 
22. 31 
13. 34 
5.94 
0.00 
57.97 
1.44 
4. 74 
72.84 
.31 
4.47 
15.05 
12.18 
59.72 
4.14 
10.38 
8.98 
9.53 
61.35 
2.50 
12.76 
8.96 
4.47 
7. 24 
2.56 
2.48 
4465 
4466 
Sec. 22, 
2 miles 
T. IS., 
south 
R. 4 E. 
Kyrene 
(crust) 
(crust) 
6.73 
4.38 
4.03 
1.24 
22.04 
29.47 
2.12 
1.65 
.91 
16.78 
61.48 
44.83 
0.70 
1.62 
1.28 
14.86 
6.13 
15.81 
4.03 
3.13 
60.33 
71.55 
.96 
2.27 
2.06 
17. 59 
8.58 
5.80 
“Means, T. h. soil survey in salt river valley, Arizona. U. S. Dept. Agr. Bur. Soils, Rpt. 
Field Oper. 1900: 287-332, illus. 1900. 
Table IV. —Chemical analyses of composite samples of second, third , and fourth 
feet of soil at Casa Grande, Arizona, 1915 a 
[Results given in parts per 100,000] 
Plant growth 
Sam¬ 
ple 
No. 
|. 
Car¬ 
bon¬ 
ates 
| Bi- 
i car¬ 
bon¬ 
ates 
Chlo- 
rids 
Sul¬ 
phates 
Cal¬ 
cium 
! 
! 
Magne- 
1 sium 
f 
1 
So¬ 
dium 
! 
Potas¬ 
sium 
L 
j trates 
i 
j 
1 
Total 
solids 
by 
evap¬ 
ora¬ 
tion 
Poor Covillea and Atriplex 
linearis ... 
j 
; 
4 
0 
1 
! *» 
41 
j 87 
42 
1 
Trace. 
| 
50 5 
i 
16 
Trace. 
290 
Atriplex polycarpa _ 
14 
0 
1 55 
54 
I 166 
10 
Trace. 
125 ! 
Trace. 
Trace. 
410 
Atriplex fasiculata .. 
5 
0 
! 36 
200 
! 249 
16 
Trace. 
245 
12 
Trace. 
Trace. 
760 
Atriplex fasiculata... . 
11 
31 
74 
108 
i 353 
10 
Trace. 
238 ' 
Trace. 
810 
Atriplex polycarpa , Atri¬ 
plex linearis (in Opuntia 
belt) ___ 
9 
0 
64 
! 
! 88 
j 
1 
416 
18 
Trace. 
i 
| 
255 
16 
Trace. 
860 
Atriplex linearis _ 
15 
6 
68 I 
i 122 1 
568 
41 
! Trace. 
339 j 
Trace. 
Trace. 
1,140 
Dondia intermedia . 
10 
106 
102 j 
i 
114 i 
348 
10 ! 
Trace. 
; 
388 ! 
10 
Trace. 
1,170 
° Analyses made in Dr. E. C. Shorey’s laboratory, Bureau of Soils, United States Department of 
Agriculture. 
The plant communities in Coachella Valley are as follows: 
Plant communities Dominant species 
Associations— 
Yucca and cactus _ Yucca mohavensis Sarg. (yucca). 
Ferocactus acanthodes (Lemaire) Britton & 
Rose (cactus). 
Opuntia bigelovii Engelm. (cactus). 
Franseria dumosa A. Gray (bur-sage). 
Creosote bush and bur-sage _ Covillea glutinosa (Engelm.) Rydb. (creosote 
bush) Franseria dumosa A. Gray (bur-sage). 
Creosote bush. _ Covillea glutinosa (Engelm.) Rydb. (creosote 
bush). 
