150 
Journal of Agricultural Research 
Vol. IX, No. 5 
Table XII .—Effect of aluminium salts on the fixation of ammonia in a soil from 
Riverside, Cal. 
Time alumini¬ 
um salt was 
allowed to stand 
before addition 
of ammonia. 
Quantity and 
strength of 
aluminium 
salt added. 
Nitro* 
gen in 
ammo¬ 
nium 
sul¬ 
phate 
added 
per 100 
gm. of 
soil. 
Nitrogen recovered. 
Aluminium 
sulphate. 
Aluminium 
chlorid. 
Aluminium 
nitrate. 
Hours. 
Mgm. 
Mgm. 
Per cent 
Mgm. 
Per cent. 
Mgm. 
Per cent. 
x . 
10 c. c. N/i.. 
50. 00 
45 - *5 
90.30 
43 - 96 
87.92 
44. 20 
88. 40 
x . 
10 C. C. N/ 2 . . 
50. OO 
42.35 
84.70 
41.44 
82. 88 
42 . OO 
84. 00 
X . 
10 C. C. NI4. . 
50. OO 
40. 67 
81.34 
40. 60 
8l. 20 
40 . 70 
81. 40 
x. 
10 c. c. N/8.. 
50. OO 
37 - 8 7 
75 - 74 
37. 80 
75.60 
37.60 
75* 20 
x . 
10 c. c. N/i6. 
50. OO 
3 1 * 4 1 
62. 82 
33- 88 
67. 76 
31.80 
63. 60 
x . 
IO C. C, N/j2. 
50. 00 
28. 63 
57- 26 
29. 96 
59 - 92 
29. OO 
58.00 
24. 
10 c. c. N/i'.. 
50. 00 
47.00 
94 . OO 
46 . 70 
93 - 40 
46. 80 
93.60 
24. 
IO C. C. N/2. . 
50. OO 
44 - S 2 
89. 04 
44 . 60 
89. 20 
44. 80 
89. 60 
24 . 
10 c. c. N/a.. 
50. OO 
42. 56 
83.12 
42 . 70 
85.40 
42. 60 
85. 20 
24 . 
10 c. c. N/8.. 
50. OO 
38. 92 
77. 84 
38. 90 
77. 80 
39 . OO 
78. 00 
24 . 
10 c. c. N/i6. 
50. OO 
33 - 60 
67. 20 
33 - 4 ° 
66. 80 
33 - 6 ° 
67. 20 
24 . 
10 c, c. NI32. 
50. OO * 
28. 84 
57 - 6 8 
28. 60 
57. 20 
28. 70 
57*40 
Table XIII .—Effect of adding iron salts on the fixation of ammonia in a soil from 
Riverside , Cal. 
Time iron salt was allowed to 
stand before addition of am¬ 
monia. 
Quantity and 
strength of iron 
salt added. 
Nitrogen 
in ammo¬ 
nium 
sulphate 
added per 
100 gm. 
of soil. 
Nitrogen: 
Iron chlorid. 
recovered. 
Iron nitrate. 
Hours. 
Mgm. 
Mgm. 
Per cent. 
Mgm. 
Per cent. 
X . 
10 C. C. N/i. . 
50. OO 
43 - 9 6 
87. 92 
45 - 71 
91.42 
X. 
IO C. C. N/ 2 . . 
50. OO 
42. 28 
84. 56 
43 - 75 
87.5° 
x. 
10 c. c. N/a.. 
50. OO 
41. l6 
82. 32 
40 . 39 
80. 78 
x. 
10 c. c. N/8.. 
50.00 
36. 12 
72. 24 
34 * 23 
68. 46 
X . 
10 c. c. N/16. 
50. OO 
32. 20. 
64. 40 
24 * 33 
48. 66 
x . 
IO C. C. N/J2. 
50. OO 
29. 40 
58.80 
27. 80 
55 - 6 ° 
24. 
10 c. c. N/i. 
50. OO 
47-32 
94.64 
47.00 
94 . OO 
24. 
10 C. C. N/ 2 . 
50. OO 
46. 20 
92. 40 
46.30 
92. 60 
24. 
10 c. c. NI4. 
50. OO 
41.32 
82. 64 
40. 90 
8l. 80 
24. 
10 c. c. N/8. 
50. OO 
34*44 
68. 88 
34.80 
69. 60 
24. 
10 c. c. N/i6. 
50. OO 
31. 20 
62. 40 
3 1 - 4 ° 
62. 80 
24. 
IO C. C. N/J 2 . 
50. OO 
28. 70 
57 * 40 
28. 60 
57. 20 
t 
