8 5 8 
Journal of Agricultural Research 
Vol. V, No. 18 
Complete data obtained in this work have been given in another place, 1 
and hence only summarized results are included here. 
The results of the ammonification tests with dried blood and cottonseed 
meal are given in Tables I and II, respectively. The nitrification tests 
with ammonium sulphate and dried blood appear in Tables III and IV, 
and the azofication results are given in Table V. 
Table I .—Ammonification of dried blood on rotation plots in ign 
Quantity of nitrogen. 
Plot No. 
Test 1. 
Test 2. 
Test 3. 
Test 4. 
601. 
M gm. 
171. II 
178. 07 
188. 82 
175. 22 
179.96 
174 75 
Mgm. 
220. 74 
231- 3 8 
243. 60 
229. 63 
238. 53 
232. 08 
Mgm. 
108. 76 
117. 86 
133 - 43 
129. 78 
118.53 
117.04 
Mgm. 
no. 58 
116. 54 
131. II 
124. 82 
116. 84 
114. 88 
604.... 
OOI..-. 
Table II .—Ammonification of cottonseed meal on rotation plots in ign 
Plot No. 
Quantity of nitrogen. 
Test 1. 
Test 2. 
Test 3. 
Test 4. 
Mgm. 
142. OI 
144 - 54 
151. 18 
145 - 49 
148. CO 
144- 07 
Mgm. 
163. 32 
168. 74 
177.81 
l68. 21 
171. OO 
165.94 
Mgm. 
102. 13 
no. 09 
120. 18 
131. 11 
105.78 
112.73 
Mgm. 
in. 08 
122. 17 
126. 64 
123. 49 
II9. 02 
55 
604. 
607. 
609.. 
001. 
Table III .—Nitrification of dried blood on rotation plots in ign 
Plot No. 
Quantity of nitrogen. 
Test 1. 
Test 2. 
Test 3. 
Test 4. 
Mgm. 
Mgm. 
Mgm. 
Mgm. 
601. 
12. 442 
19.883 
II. 864 
x 3 * 797 
15.196 
23.311 
14. 629 
17*433 
20. 776 
27. 087 
18.173 
24. 032 
15.078 
22. 884 
16. 410 
22. 211 
l8. 798 
25. 226 
x 3 * 453 
15. 048 
13. 962 
20. 713 
12. 711 
14. 014 
1 Brown, P._ E. Bacteriological studies of field soils. II. The effects of continuous cropping and various 
rotations. Iowa Agr. Exp. Sta. Research Bui. 6 , p. 211-246. 1912. 
