862 
Journal of Agricultural Research 
Vol. V, No. 1 8 
Table IX. —Ammonification of casein on rotation plots in 1912 
Plot No. 
Quantity of ammonia (in milligrams of nitrogen). 
Test 1 . 
Testa. 
Test 3. 
Test 4. , 
61. 80 
64. 84 
58.66 
55- 33 
603. 
67. 30 
71. 80 
65-13 
66. 31. 
605. 
71. 61 
76.52 
68. 47 
69 - 45 
72. 39 
79. 07 
70.63 
72. 79 
68. 67 
* 73- 37 
67.29 
69.25 
62. 78 
69. 06 
63. 18 
62. 39 
9°4. 
67. 10 
73-37 
67. 10 
68. 67 
Table X. —Nitrification of ammonium sulphate in the air-dry soil of rotation plots in IQI 2 
Plot No. 
Quantity of nitrates (in milligrams of nitrogen). 
Test 1. 
Test 2. 
Tests. 
Test 4. 
601... 
IO.431 
12. 443 
8. 444 
7. 232 
603 . 
13.489 
16.751 
12. 427 
333 
605. 
15. 114 
18. 941 
15 - 546 
14 . 557 
23- 93i 
16. 524 
15 - 250 
14. 196 
18. no 
15. 208 
14- 733 
12. 695 
12. 893 
9* 9*4 
10. 936 
9°4 . 
14- 434 
17. 410 
14.946 
14. 686 
Table XI. —Nitrification of ammonium sulphate in the fresh soil of rotation plots in 1912 
Plot No. 
Quantity of nitrates (in milligrams of nitrogen). 
Test 1. 
Test 2. 
Test 3. 
Test 4. 
II. 944 
15-3°° 
7* 183 
6. 844 
12. 728 
16. 601 
IO. 695 
9. 776 
605. 
14. 682 
22. 583 
12. 462 
12. 154 
608. 
*5- 520 
25. 078 
13- 784 
14. 224 
*3- 559 
18. 264 
12.233 
I 3- 999 
902. 
11. 960 
15 - 837 
7. 789 
10. 629 
904 . 
13. 060 
17.414 
10. 981 
13. 166 
Table XII. —The yield of corn on rotation plots in 1912 
Plot 
No. 
Treatment. 
Yield per 
acre. 
601 
Continuous corn... 
Bu. 
50*25 
63. 12 
69. OO 
74. OO 
68. 50 
59 * So 
67. 50 
603 
60? 
608 
Corn and oats... 
Cora, oats, and clover. 
Cora and oats; clover turned under. 
610 
Cora and oats; cowpeas turned under. 
902 
9°4 
Cora and oats; rye turned under. 
Cora, corn, oats, and clover.. 
