24 
Colorado Experiment Station 
RATIO OF GREEN WEIGHTS OF 
STEMS, LEAVES AND 
HEADS OF RED FIFE, 
1915 
Date 
Fertilizer 
Stems 
Leaves 
Heads 
13 July 
Nitrogen, 120 pounds . 
. 67.38 
19.50 
12.03 
13 July 
Phosphorus, 60 pounds . 
. 68.45 
16.25 
12.80 
13 July 
Potassium, 200 pounds . . . . 
. 67.46 
14.34 
13.96 
13 July 
None . 
. 69.86 
15.90 
12.41 
23 July 
Nitrogen, 120 pounds . 
. 70.00 
9.25 
20.15 
23 July 
Phosphorus, 60 pounds . . . . 
. 66.85 
7.40 
24.00 
23 July 
Potassium, 200 pounds. 
. 65.75 
6.75 
26.50 
23 July 
None . 
. 68.85 
8.85 
21.40 
6 Aug. 
Nitrogen, 120 pounds . 
. 69.25 
. . • • 
30.25 
6 Aug. 
Phosphorus, 60 pounds ... . , 
. 62.10 
.... 
36.85 
6 Aug. 
Potassium, 200 pounds . . . . 
. 61.10 
.... 
38.85 
6 Aug. 
None . 
. 63.00 
.... 
35.35 
16 July 
Nitrogen, 80 pounds . 
. 04.81 
20.06 
13.04 
16 July 
Phosphorus, 40 pounds. 
. 67.11 
17.11 
13.05 
16 July 
Potassium, 150 pounds. 
. 64.97 
15.43 
17.43 
16 July 
None . 
.. 68.55 
14.34 
14.83 
27 July 
Nitrogen, 80 pounds.. 
. 60.00 
17.00 
19.85 
27 July 
Phosphorus, 40 pounds . 
.. 58.00 
15.10 
25.00 
27 July 
Potassium, 150 pounds. 
.. 56.20 
13.85 
28.00 
27 July 
None . 
. 59.40 
14.00 
24.65 
9 Aug. 
Nitrogen, 80 pounds . 
. 66.75 
- 
32.35 
9 Aug. 
Phosphorus, 40 pounds . . . 
. 62.35 
.... 
36.25 
9 Aug. 
Potassium, 150 pounds . . . . 
. 59.50 
.... 
39.35 
9 Aug. 
None . 
... 58.75 
. .... 
39.95 
20 July 
Nitrogen, 40 pounds .. 
. 64.00 
13.00 
17.00 
20 July 
Phosphorus, 20 pounds . . . . , 
. 64.50 
15.60 
18.50 
20 July 
Pottasium, 100 pounds . . . . , 
. 62.75 
15.50 
20.35 
20 July 
None .. 
18.50 
16.75 
30 July 
Nitrogen, 40 pounds .. 
. 66.50 
6.75 
26.25 
30 July 
Phosphorus, 20 pounds .... 
. 63.10 
6.00 
29.75 
30 July 
Potassium, 100 pounds . . . . , 
. 63.25 
5.35 
30.90 
30 July 
None . 
5.55 
29.75 
9 Aug. 
Nitrogen, 40 pounds . 
. 66.25 
32.35 
9 Aug. 
Phosphorus, 20 pounds .... 
. 63.10 
.... 
35.95 
9 Aug. 
Potassium, 100 pounds .... 
. 63.10 
.... 
35.70 
9 Aug. 
None . 
. 62.25 
.... 
37.00 
Tliere is one exception to the statement that the nit.rate plots 
yielded plants with heavier stems and leaves than the others, but 
this set of samples was taken quite early in the season, 16 July. It 
may be well to state, for the benefit of those who may compai’e the 
data given here with that given for 1913, that the plants at this time, 
16 July, 1915, were several days (6 to 8) behind the plants on the 
same plots in 1913 in their development. It will be noticed that the 
weight of the heads, even up to 9 August, was as a rule less than 
from the other plots. This is entirely consonant with the results 
