Dec. 15,1925 Mineral Composition of Sunflowers Grown for Silage 1169 
The variations observed in yields are due for the most part to the 
uneven moisture and fertility conditions, because of the uneven con¬ 
tour of the land. Figure 1 represents graphically the percentage of 
mineral elements in the ash oi sunflowers from all systems of plant¬ 
ing, based on the anhydrous material. Since the majority of the sys¬ 
tems of plantings yielded sunflowers to the amount of approximately 
10 tons, a graphic representation of the pounds of mineral elements 
removed from 1 acre by sunflowers when cut for silage is given in 
Figure 2. 
Fig. 2 .—Pounds of elements removed per acre by a 10-ton Per acre crop of sunflowers. A=K20; 
B=CaO; C=N; D=MgO; E=P20«; F=»other elements 
In calculating the pounds removed per acre, the moisture per¬ 
centage taken for all stages was arbitrarily placed at 80 per cent, 
which is relatively near the average moisture for sunflowers when cut 
at this stage for silage. 
Table IV .—Analysis of ash of sunflowers—actual pounds of elements removed 
per acre * 
[Fifth stage only, i. e., when seeds of first flower were quite hard and its rays had fallen] 
No. 
Num¬ 
ber 
in 
hill 
Dis¬ 
tance 
apart 
in 
rows 
Crude 
ash 
In¬ 
solu¬ 
ble 
resi¬ 
due 
Pure 
ash 
P 2 O 5 
Fe203 
and 
AI 2 O 3 
M 113 O 4 
CaO 
K 2 0 
MgO 
Inor¬ 
ganic 
sul¬ 
phur 
P 
Total 
sul¬ 
phur 
Weight 
anhy¬ 
drous 
sun¬ 
flowers 
per acre 
11005_ 
1 
Inches 
8 
663.8 
68.3 
595.5 
21.58 
# 
6.35 
6.68 
94.77 
163.6 
30.74 
3.02 
13.07 
Pounds 
4,701 
11008_ 
1 
24 
378.5 
40.96 
337.5 
19.46 
2.88 
4.69 
66.38 
111.8 
16.31 
2.91 
9.67 
2,966 
11010 _ 
1 
42 
479.5 
78.76 
400.8 
25.37 
6.51 
3.52 
107. 57 
138.7 
34 13 
3.22 
7.27 
3,996 
11011 .. 
2 
42 
461. 1 
51. 63 
409.5 
23.14 
5.14 
4.11 
83.73 
160.1 
29.65 
3.26 
9.34 
4,285 
11002 _ 
3 
42 
542.1 
55.70 
486.4 
26.67 
4.90 
4.02 
93.30 
162.4 
20.29 
3.61 
13.38 
4, 372 
11013_ 
4 
42 
469.4 
50.88 
418.5 
24. 73 
4.76 
3.78 
83.80 
170.1 
16.62 
3.06 
6.69 
3,938 
Average. 
499. 1 
57.71 
441.4 
23.50 
5.09 
4.47 
88.28j 
151.1 
24.62 
3.18 
9.90 
4,043 
