Jan. 13 , 1923 
Effect of Inorganic Nitrogen on Wheat 
59 
uniform plots for the three applications of each chemical and also for 
certain groups of chemicals. The more uniform plots were assigned to 
the nitrogen carriers. Consequently, the control plots were not true 
representatives of normal conditions. Deviations from the controls 
were not necessarily due to the treatments in the case of the tendencies 
which were not sharply defined but which might have been detected 
under normal conditions. 
Another element of disturbance affecting the regularity of the results 
was introduced by the fact that there was no uniform transition from one 
stage to another. When most of the plants on the plots were headed out 
some had not yet reached that stage. The same thing occurred during 
the transition from the second to the third stage. 
Moreover, a heavy rainfall, coming just as the treatment of one series 
v’as finished, interfered with the second stage application. Part of the 
chemicals applied to that series were thus probably washed out. The 
other series had to be treated when the soil was completely saturated. 
As a result, a portion of the chemicals which were applied in solution ran 
off from some of the plots. This probably accounts for part of the irregu¬ 
larities which will be found in the tables. 
With all these disturbing factors, however, the principal tendencies 
resulting from the application of the various nitrogen carriers were not 
obscured, due-probably to the fact that of the 114 plots of the experiment 
54 received nitrogen. The remaining 60 plots served as controls with 
reference to the effects of this element. Similarly, the plots which re¬ 
ceived the nitrogen in the third stage frequently served as controls for 
the plots of the other two stages of the groups. 
Table I .—Total yield and percentage of grain from plots to which chemicals were applied 
at various stages of growth 
Series A. 
j Series B. 
Chemicals applied. 
Total yield. 
! 
Percentage of 
grain. 
j 
Total yield. 
Percentage of 
grain. 
Stage 
Stage 
1 Stage 
i Stage 
Stage 
Stage 
i Stage 
Stage 
Stage 
Stage 
Stage 
Stage 
X. 
2. 
3 . 
i. 
2. 
3 - 
1. 
2. 
3 - 
1. 
2. 
3 - 
Lbs. 
Lbs. 
Lbs. 
j Lbs. 
Lbs. 
Lbs. 
Sodium nitrate. 
50.2 
30. 0 
45-9 
39.5 
27. 0 
39-8 
26. 0 
31 - I 
33 . 2 
33 - 0 
33-5 
25-0 
29 - 5 
ax -5 
28.5 
24. 2 
23 - I 
29-3 
21. 7 
27 - 5 
24. 6 
36. 9 
42.9 
37-3 
34-5 
36.8 
38 . 5 
42. 2 
41. 9 
40.5 
41. 5 
39 - 3 
45-8 
39-4 
41.3 
42. 7 
40.4 
42. 8 
38.6 
40. 4 
40. 7 
39-3 
34 - 7 
26. 0 
26. 5 
2 5 - 5 
23. 0 
25-4 
28. 2 
2 3 - 4 
23 - 7 
24. 8 
22. 5 
21. 5 
25. 4 
25. 2 
33-3 
39 - 6 
35 - 9 
40. 1 
42. 4 
34. 8 
41. 8 
43.3 
41.9 
38. 2 
39-4 
39 - 8 
40. 2 
42. 6 
38. 2 
41. 4 
Potassium chlorid. 
Calcium nitrate. 
33 - 5 
29. 5 
27. 2 
33 - 5 
22. 8 
38.3 
36.8 
42.4 
39-5 
38.8 
Ammonium sulphate. 
Sodium hydroxid. 
Potassium nitrate. 
31. 8 
24. 2 
Sulphuric acid. 
Ammonium chlorid. 
39.0 
33 . 0 
23- 7 
46.3 
41-3 
42. 6 
30. 6 
26. 7 
21. 0 
39 - 5 
42-3 
43.0 
Potassium hydroxid. 
22. 0 
23.3 
29.9 
44 - 1 
41. 8 
42. 6 
25. 0 
24. 8 
23. 0 
42. 6 
41. 7 
42. 7 
Ammonium nitrate. 
\ 49 - 7 
37 * 9 
! 29.7 
38.2 
42. 1 
43- 2 
38.2 
26. 3 
25. 6 
34-3 
40. 8 
42. 7 
Water. i 
24 - 5 
43-6 
23 - 5 
44-3 
U- 
Control. 
24. 7 
43-8 
24- 5 
41. 8 
Sodium chlorid. 
24. 2 i 
27.5 
30.0 
44.0 
i 43 - 1 
! 44. 1 
24. 7 
24. 8 
22. 9 
44. 2 
41.9 1 
[ 42.5 
Calcium chlorid. 
! 33 - 8 
33 - 5 
23.4 
! 31-5 
j 25. 0 
42. 0 
41. 6 
j 44-5 
! 40.9 
j 37-4 
j 42.9 
21. 8 
23. 0 
23. 3 
24. 0 
23. 5 
44. 6 
42. 7 
43 - 3 
| 4 i. 9 
| 43 - 7 
Hydrochloric acid.j 
25 * 1 
25. 2 
42.8 
Potassium sulphate. 
32. 7 
32 . 1 
: 30 . 7 
41.4 
j 4 * S 
! 4 i -9 
27 - 5 
25 - 5 
23. 0 
42. 7 
42.3 
41. 6 
Magnesium nitrate. 
; 34-4 I 
| 26. 1 
23. 6 
40 - 3 
| 4 2 - 1 
: 45-4 
33-9 
20. 4 
21. 3 
37 - 2 
41.4 
42. 6 
Magnesium chlorid. 
: 34 - 7 ! 
31. 2 
27. 1 
41.4 
43- 2 
: 43-8 
: 27. O 
25. 0 
24. 4 
43- 8 
43 - 5 
38. 2 
Nitric acid. 
! 40. 2 
i 27. 2 
25 -9 
33 - 9 
38. 2 
38.6 
! 3 S-o 
26. 1 
24-3 
33 - 9 
37 - 7 
40. 2 
Ammonia. 
: 42. 2 
; 36. O 
42.3 
38.9 
43 - 5 
Water. 
28. 5 
37 - 7 
i 
31 . 5 
Control. 
29. 6 
40. 7 
21. 7 
39-8 
