9i6 
Journal of Agricultural Research 
Vol. XXIV, No. It 
Table VI.—Correlation between reaction and presence of Azotobacter in soils of Series I 
Ph determined electrometrically. 
Soil No. 
1 
! Ph. 
1 
Azoto¬ 
bacter. 
43 . 
t 
■ 8.7s 
+ 
79 . 
.1 8.48 
+ 
80. 
• 7-84 
53 . 
• 7-79 
+ 
81. 
• 7-77 
+ 
89. 
• 7-76 
4 * 
83. 
. 7.72 
4- 
31. 
• 7-71 
4 - 
44 . 
. 7.71 
+ 
35. 
4. 
85. 
7 62 
1 
-L 
86. 
7.60 
r 
4 - 
82. 
7.60 
_L 
87. 
7-59 
r 
+ 
62 . 
7-55 
4 " 
78. 
7-54 
+ 
47 . 
7-52 
+ 
55 . 
7-50 
+ 
59 . 
7-49 
+ 
84. 
7-47 
+ 
45. 
7-45 
+ 
63. 
7-43 
4 " 
57 . 
7-30 
+ 
75 . 
7 - 3 ° 
+ 
29. 
7.27 
+ 
52. 
7.27 
“h 
74. 
7 .2tJ 
4- 
56. 
/ • 
7.18 
1 
4_ 
90. 
7 .06 
r 
-L 
42. 
7 . 0 <J 
4. 
70. 
6.02 
4- 
88. 
6.88 
r 
4- 
34. 
6.72 
40. 
6.72 
4- 
72. 
6.72 
4. 
33 . 
vr. ^.6 
6.«;6 
48. 
6. *12 
4 - 
25. 
6.4.1: 
4- 
64. 
6.2*; 
4- 
54. 
6.18 
4- 
26 . 
6.12 
4- 
36. 
6.12 
4 - 
37. 
6.07 
39. 
6.0*; 
V/. 
4- 
68. 
6.05 
_L 
r . . 
Soil 
No 
46.. . 
41. . . 
65.. . 
27.. . 
73 .. - 
28.. . 
32.. . 
66 .. . 
60.. . 
76.. . 
71.. . 
38.. . 
61.. . 
58.. . 
30.. - 
77.. . 
50-.. 
67.. . 
22.. . 
69.. . 
20.. . 
23.. . 
21.. . 
49 ••• 
24.. . 
Ph. 
6.03 
5-98 
5-94 
5.88 
5-88 
5-86 
5-73 
5-63 
5-6 i 
5*59 
5-51 
5*46 
5-41 
5-39 
5-34 
5-32 
532 
5-27 
5-19 
5-10 
5.10 
505 
5-03 
4.90 
Ph determined colorimetric**! y. 
Azoto 
bacter 
- Soil 
. No. 
Ph. 
Azoto 
bactei 
*- Soil 
■. No. 
Ph. 
Azoto¬ 
bacter. 
87.. 
. 7.8 
37-- 
6.2 
+ 
43-• 
• 7-7 
+ 
27.. 
6.1 
4- 
53•• 
• 7.7 
39- 
6.1 
4” 
4- 
78.. 
■ 7-7 
+ 
64.. 
6.1 
-f- 
— 
79.. 
• 7-7 
+ 
68.. 
6.1 
+ 
82.. 
• 7-7 
■f' 
36.. 
6.0 
4- 
— 
29.. 
. 7.6 
4' 
41.. 
6.0 
4" 
— 
35- 
. 7-6 
4- 
54... 
6.0 
4- 
— 
80... 
7.6 
+ 
I2 <^. . 
5-9 
— 
83... 
7.6 
+ 
32... 
5-9 
— 
4- 
3i--. 
7*5 
4- 
1 46... 
5-9 
— 
— 
44..- 
7-5 
4- 
73-•• 
5-9 
— 
55--- 
7-5 
“h 
II®.. 
5-8 
— 
57-•• 
7-5 
4- 
50-•• 
5-8 
— 
— 
62... 
7-5 
~h 
60... 
5-8 
_ 
— 
75- 
7-5 
4- 
6®... 
5-7 
__ 
— 
84... 
7-5 
4- 
7®.. 
5-7 
— 
— 
85... 
7.5 
4- 
19®.. 
5-7 
86... 
7.5 
4- 
65... 
5-7 
— 
89... 
7-5 
+ 
66... 
5-7 
— 
14®.. 
7-4 
+ 
3®--. 
5-6 
—. 
15a.. 
7-4 
4- 
8®... 
5-6 
— 
— 
42... 
7-4 
4- 
10®.. 
5-6 
— 
45* •• 
7-4 
4- 
13®- - 
5.6 
—. 
— 
47. • • 
7-4 
4- 
16®.. 
5-6 
_ 
— 
56... 
7-4 
“j” 
18®.. 
5-6 
— 
59-•• 
7-4 
+ 
21... 
5-6 
— 
63... 
7-4 
4* 
22... 
5-6 
_ 
74... 
7-4 
4" 
23... 
5-6 
— 
81... 
7-4 
4- 
24... 
5-6 
— 
57-•• 
7-3 
+ 
5-6 
— 
90... 
7-3 
4- 
38... 
5-6 
— 
5«-.* 
7-1 
4- 
69... 
5-6 
— 
25... 
7.0 
4- 
71... 
5.6 
4- 
40... 
7.0 
+ 
77... 
5-6 
72... 
7.0 
+ 
9®-.. 
5-5 
— 
i«... 
6.9 
4- 
17®.. 
5-5 
— 
4®... 
6.9 
4" 
49- • • 
5-5 
— 
88... 
6.9 
4- 
58... 
5-5 
— 
34-•• 
6.8 
— 
61.., 
5-5 
— 
70... 
6.8 
4- 
67... 
5-5 
— 
33. •• 
6.7 
— 
76. .. 
5-5 
— 
26. .. 
6.6 
4- 
2®... 
5-4 
_ 
48. .. 
6.4 
4- 
20.. . 
5-4 
_ 
28... 
6.2 j 
4- 
51-.- 
5-3 
— 
a Ph not determined electrometrically. 
