26 
Colorado Experiment Station 
DRY MATTER IN PLANTS GROWN WITH DIFFERENT FERTILIZERS—SEASON 1915 
Date 
Section 
Fertilizer 
Defiance 
Red Fife 
Kubanka 
13 July 
1700 
Nitrogen, 120 pounds . . . 
. 21.30 
25.25 
25.00 
13 July 
1700 
Phosphorus, 60 pounds . . 
. 25.99 
29.49 
29.90 
13 July 
1700 
Ptotassium, 200 pounds . 
. 25.20 
30.87 
30.59 
13 July 
1700 
None . 
. 24.63 
28.12 
27.34 
14 July 
1800 
Nitrogen, 80 pounds . . . 
. 19.75 
25.15 
26.29 
14 July 
1800 
Phosphorus, 40 pounds . 
. 20.04 
28.33 
30.00 
14 July 
1800 
Potassium, 150 pounds . 
. 25.46 
30.31 
31.87 
14 July 
1800 
None . 
. 23.16 
27.65 
32.03 
15 July 
1900 
Nitrogen, 40 pounds . . . 
. 28.63 
30.62 
29.53 
15 July 
1900 
Phosphorus, 20 pounds .. 
. 28.59 
30.93 
33.59 
15 July 
1900 
Potassium, 100 pounds . 
. 29.63 
32.97 
33.59 
15 July 
1900 
None . 
. 29.33 
31.40 
31.56 
21 July 
1700 
Nitrogen, 120 pounds . . . 
. 25.31 
27.50 
33.28 
21 July 
1700 
Phosphorus, 60 pounds . 
. -31.87 
36.72 
36.25 
21 July 
1700 
Potassium, 200 pounds . 
. 31.25 
35.62 
36.25 
21 July 
1700 
None . 
. 29.53 
36.87 
36.87 
24 July 
1800 
Nitrogen, 80 pounds . . . 
. 28.43 
33.75 
33.90 
24 July 
1800 
Phosphorus, 40 pounds . 
. 36.40 
40.62 
40.62 
24 July 
1800 
Potassium, 150 pounds . 
. 35.62 
38.90 
38.75 
24 July 
1800 
None . . .. 
. 33.90 
39.69 
41.25 
26 July 
1900 
Nitrogen, 40 pounds . . . 
. 35.46 
37.65 
38.94 
26 July 
1900 
Phosphorus, 20 pounds . 
. 37.57 
39.37 
39.76 
26 July 
1900 
Potassium, 100 pounds . 
. 37.50 
40.00 
40.47 
26 July 
1900 
None . 
. 36.56 
39.22 
40.15 
4 Aug. 
1700 
Nitrogen, 120 pounds . . 
. 36.82 
40.47 
37.97 
4 Aug. 
1700 
Phosphorus, 60 pounds . 
. 43.90 
46.72 
45.00 
4 Aug. 
1700 
Potassium, 200 pounds . 
. 43.43 
45.78 
44.37 
4 Aug. 
1700 
None .. 
. 39.84 
45.47 
43.75 
5 Aug. 
1800 
Nitrogen, 80 pounds . . . 
. 35.31 
41.72 
43.90 
5 Aug. 
1800 
Phosphorus, 40 pounds . 
. 42.50 
45.00 
46.09 
5 Aug. 
1800 
Potassium, 150 pounds . 
. 41.40 
46.25 
44.53 
5 Aug. 
1800 
None .. 
. 40.93 
45.47 
47.19 
10 Aug. 
1900 
Nitrogen, 40 pounds ... 
. 44.84 
49.<»7 
51.25 
10 Aug. 
1900 
Phosphorus, 20 pounds . 
. 48.12 
52.65 
51.25 
10 Aug. 
1900 
Potassium, 100 pounds . 
. 49.84 
53.90 
50.78 
10 Aug. 
1900 
None . 
. 47.65 
52.65 
48.75 
The dry matter given in the preceding table is the weight of 
the air-dried plants. In 1913 we found the air-dried material to con¬ 
tain from 5.566 to 8.652 percent of moisture; in 1915 we find the 
amount of moisture, in the few samples on which this determination 
has been made, much more uniform from 5.00 to 5.68 percent. It is 
but fair to state that all of the determinations made were on sam¬ 
ples of Red Fife and may not hold strictly for the other varieties. 
The results, however, indicate that we are justified in assuming that 
the term air-dried means that the plants still contain an average of 
