Dec. 15,1925 Mineral Composition of Sunflowers Grown for Silage 1191 
fourth, and fifth feet of soil, except the first sampling in the spring, 
the midsummer sampling, and the last sampling in the fall when 
samples were taken to a depth of 10 feet. The crops were harvested 
in the autumn and a careful record was made at the time of threshing 
of the pounds per plot of both grain and straw. Samples of both 
were taken from all plots and analyzed for total nitrogen. 
Table I .—Yield in pounds of grain and straw , percentage of nitrogen in the crop f 
pounds of nitrogen removed by the crop y average percentage of moisture found 
in the first 3 feet of soil during the growing season , the average parts per million 
of nitrate nitrogen, and the concentration of the nitrate nitrogen in the soil solution 
PART 1. WINTER WHEAT—CONTINUOUS CROPPING 
Year 
Plot 
Yields, in 
pounds 
Percentage 
of nitrogen 
in— 
Pounds of 
nitrogen 
removed 
by— 
Total 
nitro¬ 
gen re¬ 
moved 
Per¬ 
centage 
of water 
in first 
3 feet 
of soil 
P. P 
M. 
nitrate 
nitro¬ 
gen in 
first 3 
feet of 
soil 
Con¬ 
centra¬ 
tion of 
nitrate 
nitro¬ 
gen in 
soil 
solution 
Dates of sampling 
Grain 
Straw 
Grain 
Straw 
Grain 
Straw 
First 
Last 
1911.. 
1 
95.0 
259 
2.30 
2.18 
15.55 
2.05 
11.3 
May 2 
July 11 
1912_ 
1 
102.6 
149 
2.30 
0.44 
2.36 
0.66 
3.02 
16.34 
6.38 
33.6 
Apr. 29 
July 26 
1913._ 
1 
65.2 
118 
1.78 
.40 
1.16 
.47 
1.63 
12.76 
2.06 
14.2 
May 6 
July 28 
1914— 
1 
71.3 
57.9 
2.08 
.59. 
1.48 
.34 
1.82 
15.22 
2.23 
12.7 
May 9 
July 21 
1915— 
1 
82.7 
131.3 
2.13 
.34 
1.76 
.45 
2.21 
20.58 
2.26 
9.1 
May 10 
July 20 
1916— 
1 
72.2 
94 
1.92 
.43 
1.38 
.40 
1.78 
20.05 
2.03 
8.4 
Apr. 26 
Aug. 7 
1917— 
1 
21.8 
35 
2.10 
.67 
.46 
.23 
.69 
18.49 
2.14 
9.8 
May 8 
July 17 
Avei 
age.. 
72.9 
120.7 
2.09 
.48 
1.54 
0.42 
1.86 
17.00 
2.73 
14.2 
SPRING WHEAT—CONTINUOUS CROPPING 
1911_ 
2 
61.8 
128.0 
1.50 
0.69 
0.93 
0.88 
1.84 
16.34 
2.51 
13.2 
May 16 
Aug. 
15 
1912_ 
2 
101.7 
150.0 
1.91 
.34 
1.94 
.51 
2.47 
15.91 
4.29 
23.2 
May 21 
Sept. 
4 
1913— 
2 
66.2 
123.7 
1.98 
.42 
1.31 
.52 
1.83 
13.91 
1.95 
12.3 
May 23 
Aug. 
7 
1914-_ 
2 
38.4 
104.5 
2.66 
.63 
1.02 
.66 
1.68 
16.25 
2.04 
10.8 
June 3 
Aug. 
17 
1915— 
2 
50.0 
117.6 
2.12 
.58 
1.06 
.68 
1.75 
19.25 
1.85 
8.0 
May 24 
Aug. 
24 
1916— 
2 
77.0 
87.0 
2.02 
.28 
1.55 
.24 
1.85 
20.02 
2.25 
9.4 
May 23 
Aug. 
7 
1917— 
2 
30.0 
57.0 
2.09 
.57 
.62 
.32 
.95 
16.39 
1.48 
7.7 
May 24 
Aug. 
9 
Aver 
age-. 
60.7 
109.7 
2.04 
.50 
1.20 
.54 
1.78 
1 
16.87 
1 
2.34 
12.1 
PART 2. WINTER WHEAT—ALTERNATE FALLOW AND CROP 
1911— 
12 
103.5 
284.0 
2.30 
0.51 
2.38 
1.45 
3.83 
15.35 
4.06 
22.9 
May 
6 
July 15 
1912— 
16 
158.6 
316.3 
2.36 
.53 
3.74 
1.68 
5.42 
16.34 
12.68 
66.6 
May 
9 
July 29 
1913- 
12 
149.8 
206.4 
2.40 
.44 
3.60 
.91 
4.51 
15.26 
5.69 
32.4 
May 
9 
July 28 
1914— 
16 
105.0 
326.8 
2.70 
.57 
2.84 
1.86 
4.72 
15.76 
2.13 
11.7 
May 
6 
July 22 
1915— 
12 
156.3 
342.0 
2.06 
.32 
3.22 
1.09 
4.31 
19.34 
2.43 
10.5 
May 13 
July 12 
1916-- 
16 
117.0 
161.5 
2.63 
.51 
3.08 
.82 
3.90 
22.49 
5.17 
18.8 
May 
2 
Aug. 7 
1917— 
12 
.53.2 
118.8 
2.90 
.76 
1.54 
.90 
2.45 
17.98 
4.33 
20.4 
May 
8 
July 18 
Avei 
•age„ 
120.5 
250.8 
2.48 
.52 
2.90 
1.24 
4.16 
17.50 
5.21 
26.2 
SPRING WHEAT—ALTERNATE FALLOW AND CROP 
1911— 
17 
99.8 
190.0 
2.30 
0.51 
2.29 
0.97 
3.26 
17.03 
5.75 
28.8 
May 16 
Aug. 
17 
1912— 
13 
145.3 
210.9 
2.94 
.78 
4.27 
1.65 
5.92 
14.43 
7.79 
47.3 
May 23 
Sept. 
4 
1913— 
17 
129.7 
259.3 
2.75 
.41 
3.57 
1.06 
4.62 
13.91 
5.57 
35.1 
May 23 
Aug. 
7 
1914— 
13 
61.4 
186.0 
3.28 
.89 
2.01 
1.65 
3.66 
17.59 
4.08 
19.5 
May 21 
Aug. 
3 
1915-_ 
17 
91.8 
284.4 
2.64 
.64 
2.42 
1.82 
4.25 
19.25 
3.84 
16.7 
May 26 
Aug. 24 
1916-- 
13 
117.8 
172.0 
2.85 
.46 
3.35 
.79 
4.14 
21.01 
7.79 
30.6 
May 23 
Aug. 
5 
1917— 
17 
40.8 
73.0 
2.84 
.69 
1.16 
.51 
1.67 
16.39 
7.03 
37.0 
May 24 
Aug. 
15 
Aver 
‘age.. 
98.1 
196.5 
2.80 
.63 
2.72 
1.21 
3.93 
17.09 
5.98 
30.7 
