64 
Journal of Agricultural Research 
Vol. VII, No. 2 
total nitrogen present and nitrate produced. Thus, for example, in the 
Riverside area, as in the Bay area, the largest amount of nitrate formed 
from the soil nitrogen is found in the soil with the highest total nitrogen 
content, but no nitrates are produced by the soil with the third highest 
total nitrogen content. 
Tabi,B V .—Nitrification in Riverside area soil types 
Soil nitrogen 
Soil nitrogen and sulphate of 
(Group I). ammonia 
(Group II). 
Soil nitrogen 
and dried blood 
(Group III). 
Soil nitrogen 
and cottonseed 
meal (Group IV), 
Name of type. 
Total 
nitro¬ 
gen 
pres¬ 
ent in 
soil. 
Nitro¬ 
gen 
nitri¬ 
fied. 
Ni¬ 
trate 
pro¬ 
duced 
Total 
nitro¬ 
gen 
pres¬ 
ent in 
soil. 
Nitro- Ni- 
gen trate 
nitri- pro- 
fied. duced 
Total 
nitro¬ 
gen 
pres¬ 
ent in 
soil. 
Nitro¬ 
gen 
nitri¬ 
fied. 
Ni¬ 
trate 
pro¬ 
duced 
Total! 
nitro¬ 
gen 
pres¬ 
ent in 
soil. 
Nitro¬ 
gen 
nitri¬ 
fied. 
Mgm. 
Mgm. 
P.ct. 
San Joaquin sandy loam... 
1.80 
32.20 
5 + 
Placentia loam. 
5*80 
42.00 
13+ 
Zelzah sandy loam. 
4.00 
26.60 
15 + 
Tejunga fine sandy loam... 
5.20 
47-60 
10+ 
Sierra loam. 
.60 
15.40 
3 + 
Placentia sandy loam. 
5.18 
22.40 
23 + 
Tejunga fine sand.. 
3-92 
28.00 
7 + 
Zelzah loam,. 
3*74 
32.20 
11+ 
Zelzah clay loam. 
3*40 
53*20 
6+ 
Holland sandy loam. 
2.80 
29.40 
9 + 
Hanford loam. 
2.80 
28.00 
10+ 
Hanford clay loam. 
6.80 
74-20 
9 + 
Sierra loam. 
1.90 
32.20 
5 + 
Hanford sandy loam. 
5*96 
28.00 
21+ 
Hanford fine sandy loam... 
5-35 
33 * 60 
15 + 
Hanford gravelly sandy 
loam. 
1.40 
36.40 
3 + 
Hanford stony gravelly 
sandy loam. 
3-80 
44.80 
8+ 
Hanford loam. 
5-60 
49*00 
11+ 
Hanford stony sand. 
2 *35 
5-60 
41+ 
Hanford sandy loam. 
4.05 
43-40 
9+ 
Tejunga sand. 
3*00 
14.00 
21 + 
Tejunga gravelly sand. 
1-52 
11.12 
13 + 
Hanford sand. 
S-6o 
21.00 
26+ 
Hanford gravelly sand. 
4.10 
37.80 
10+ 
San Joaquin loain. 
2.00 
35 -oo 
5 + 
Tejunga sandy loam. 
3.20 
33 -60 
9 + 
Hanford fine sandy loam... 
•4.00 
28.00 
14+ 
Hanford gravelly loam. 
4.92 
47-60 
10+ 
Placentia gravelly loam.... 
5 - 00 
36.40 
13+ 
Hanford stony loam. 
no. 60 
Hanford coarse sandy loam. 
3-io 
37.80 
8 + 
Montezuma loam. 
6.20 
161.00 
3 + 
Montezuma clay adobe. 
4-45 
33 * 60 
13 + 
Hanford coarse sand. 
*•35 
15.40 
8 + 
Pedley fine sandy loam.... 
2.40 
32. 20 
7 + 
Montezuma silty clay loam. 
7.40 
182.00 
4 + 
Hanford coarse sandy loam. 
1.85 
21.00 
8 + 
Olympic loam. 
3*60 
40.60 
8 + 
Oakley sand. 
3*oo 
26.60 
11+ 
Tejunga stony sand. 
Kimball fine sandy loam... 
2.40 
9.80 
24+ 
Aiken loam... 
6.00 
50.40 
11+ 
Mendocino loam. 
3-oo 
21.00 
14+ 
Holland fine sandy loam,.. 
4.00 
39- 20 
10+ 
Corona gravelly sandy loam 
5-10 
54 -60 
9 + 
Corona clay loam. 
3.80 
50.40 
7 + 
Yolo gravelly loam. 
4.00 
47 -60 
8+ 
Rincon loam. 
2.80 
39- 20 
7 + 
Antioch silty clay loam.,.. 
3*80 
35 -oo 
10+ 
Hanford silty clay loam.... 
I.SO 
28.00 
5 + 
Placentia clay. 
2.00 
42.00 
4 + 
Sierra sandy loam. 
4.80 
25. 20 
19+ 
Holland loam. 
2.40 
28.00 
8 + 
Mgm. 
Mgm. 
P.ct. 
Mgm. 
Mgm. 
P.ct. 
Mgm. 
Mgm. 
P.ct. 
1.50 
72.20 
2+ 
—1.00 
164.20 
10.00 
79.20 
12+ 
15-30 
82.00 
18+ 
47- 90 
174.00 
27+ 
21.90 
89.00 
24+ 
40.00 
66.60 
60+ 
158.60 
32.00 
73.60 
A?* f* 
47.20 
87.60 
53+ 
95-20 
179.60 
53+ 
50.40 
94-60 
53 + 
1.50 
55.40 
2 + 
147.40 
3.00 
62.40 
4+ 
6.07 
62.40 
9+ 
—, 12 
154.40 
11.88 
69.40 
17+ 
63.92 
68.00 
9+ 
-.08 
160.00 
14.92 
75-00 
19+ 
9*74 
72.20 
13 + 
8.54 
164.20 
5+ 
15-74 
79.20 
19+ 
13.90 
93-20 
14+ 
32.10 
185.20 
17+ 
15.90 
i00.20 
15 + 
5.00 
69.40 
7+ 
161.40 
12.80 
76.40 
x 64- 
6.40 
68.00 
9+ 
6.00 
160.00 
3+ 
20. op 
75-oo 
26+ 
23.40 
114.20 
20+ 
63.60 
206.20 
30+ 
38.40 
121.20 
31+ 
4.80 
72.20 
6+ 
23.80 
164.20 
14+ 
11.80 
79* 20 
14+ 
9-36 
68.00 
13+ 
—.04 
160.00 
6.96 
7S-oo 
9+ 
15-75 
73-60 
21 + 
5- 75 
165.60 
3+ 
31-75 
80.60 
39+ 
17.40 
76.40 
22+ 
—.60 
168.40 
27.40 
83.40 
32+ 
12.60 
84.80 
14+ 
176.80 
17.50 
91.80 
19+ 
27.60 
89.00 
31 + 
33*6o 
181.00 
18+ 
63.60 
96.00 
66+ 
1*15 
45-60 
2+ 
-*05 
137-60 
•95 
52.60 
1+ 
8.85 
83,40 
10+ 
38.85 
175-40 
22+ 
27- 85 
90.40 
30+ 
1.90 
54- 00 
3+ 
146.00 
3* 00 
61.00 
4+ 
19-93 
5X-12 
38+ 
—.08; 
143-12 
• ••*«« 
4. 22 
58.12 
7+ 
.80 
61.00 
1+ 
.60 
i53-oo 
Tr. 
2. 80 
68.00 
4+ 
4.10 
77-8o 
5+ 
-1.50 
169.80 
15.20 
84.00 
18+ 
14.00 
75.00 
18+ 
1.60 
167.00 
Tr. 
25.40 
82.00 
30+ 
7. 20 
73-60 
9+ 
8.40 
165.60 
5+ 
15.20 
80.60 
18+ 
12.00 
68.00 
17+ 
.90 
160.00 
Tr. 
16.00 
7S-oo 
21+ 
7.92 
87.60 
9 + 
1.42 
179. 60 
Tr. 
13.92 
94-60 
14+ 
2.00 
76.40 
2+ 
.90 
168.40 
Tr. 
.40 
83.40 
Tr. 
15. 70 
150.60 
10+ 
47.40 
242 60 
19+ 
17.40 
157-60 
11+ 
4.00 
77-8o 
5+ 
2.40 
169.80 
1+ 
24.00 
84.80 
28+ 
44-oo 
201.00 
21+ 
49-60 
293.00 
16+ 
32.50 
208.00 
15+ 
5-95 
73-60 
8+ 
2,15 
168.60 
1+ 
3-35 
80.60 
4+ 
•45 
55-40 
Tr. 
—-05 
286.00 
•45 
62.40 
Tr. 
3*30 
72. 20 
4+ 
.80 
164. 20 
Tr. 
6. 50 
79. 20 
8+ 
46.40 
222.00 
20+ 
70.40 
314-00 
22+ 
38.40 
229.00 
16+ 
I - 95 
61.00 
3 + 
-.15 
153.00 
3-85 
68.00 
5+ 
6.00 
80. 60 
7+ 
4.40 
172.60 
2+ 
4.00 
87.60 
4+ 
6.40 
66.60 
9+ 
158.60 
1.30 
73-60 
1+ 
3-10 
1.40 
35- 00 
8.00 
49. So 
16+ 
5-oo 
141.80 
3 + 
18.00 
56.80 
3i + 
7.00 
90.40 
7+ 
20.00 
182.40 
10+ 
14. 20 
97-4° 
14+ 
5-20 
61.00 
8+ 
16.00 
i53-oo 
10+ 
7-50 
68 . 00 
11+ 
10.00 
79. 20 
12+ 
•50 
171. 20 
Tr. 
15.60 
86. 20 
18+ 
13.80 
94.60 
14+ 
58.40 
186.60 
31+ 
28.40 
101.60 
27+ 
5 -oo 
90.40 
5 + 
20.00 
182.40 
10+ 
14.00 
97-40 
14+ 
7.00 
87.60 
7+ 
32.00 
179.60 
17+ 
15*80 
94.60 
16+ 
3.20 
79. 20 
4+ 
4.00 
171. 20 
2+ 
3-oo 
86. 20 
3 + 
7.80 
75.00 
10+ 
26.30 
167.00 
15+ 
14. 80 
82.00 
18+ 
5*oo 
68.00 
7+ 
2.10 
160.00 
1+ 
2. 80 
75-00 
- 3 + 
8.00 
82.00 
9 + 
12.00 
174.00 
6+ 
14.60 
89.00 
16+ 
5.20 
65. 20 
7+ 
.70 
157- 20 
13- 20 
72. 20 
18+ 
3.00 
68.00 
4+ 
160.00. 
9. 20 
75-00 
12 + 
