364 
Journal of Agricultural R esearch 
Vol. XXVII, No. 
was detrimental, but it was because it promoted excessive production 
of straw and low yield of grain rather than because of any effect it may 
have had on the rust. The highest percentage of rust was 67 in the 
plat which had received only sodium nitrate at the rate of 1,000 pounds 
during each of the three years. But this amount of rust does not neces¬ 
sarily cause a decrease in yield, as is shown by the fact that in 1915 the 
highest yield in the commercial fertilizer plats was 31 bushels per acre 
from a plat in which the percentage of stem rust was 88 per cent. 
Attf C£WT 
/OO 
9o 
80 
70 
60 
So 
4o 
30 
Zo 
/o 
O 
A/ 
/ooo 
/V 
Soo 
N 
zso 
/VOA/£ 
K 
/ooo 
K 
soo 
X 
zso 
’qU/S 
:v 
^ a 
- V, 
i' 
% 
x,^ 
\ it- 
0 * 
* 
0* 
\ 
• ^ 0 
y / 
* r * ■ 1 
_ 
N 
— x 
\ 
- \ -■ 
’ RUST 
.../ ™ 
% 
• 
V 
' 
/ ' 
.gfee. • 
®_ z 
# 
# 
♦ 
I 
N* 
Vi 
Fig. 4.— Graph showing the percentages of stem rust, yellow-berry, seed shriveling, and lodging of 
M j r S^ir S wheat £rown m plats which had received acid phosphate at the rate of 2,000 pounds per acre 
and different amounts, in pounds, of potassium sulphate (K) in 1916 and different amounts of sodium 
nitrate (N) m 1917, in commercial fertilizer experiments in 1917 on University Farm, St Paul, Minn. 
stem rust. 
- yellow-berry. 
- seed shriveling. 
• lodging. 
Table X .—The effect of fertilizers on the yields, in kilograms , of seed and straw of Mar¬ 
quis wheat and on the ratio of seed to straw in the commercial fertilizer plats in IQ17 
on University Farm , St. Paul , Minn. 
Weight of seed and straw, 
and ratio of seed to straw. 
Fertilizer. 
Fertilizer, kind and amount (pounds) per acre. 
Kind. 
Amount 
per 
acre. 
Sodium nitrate. 
None. 
Potassium chlorid 
residual.® 
1,000 
Soo 
250 
1,000 
Soo 
250 
Pounds. 
Weight of seed. 
f I * 1 
i -3 
2. 5 
3 - 2 
2. 2 
I. 9 
2. 0 
Weight of straw. 
C 3 4 
2 , OOO 
\ 7-7 
8.4 
7-9 
7-4 
5-3 
5 - 6 
4 - 7 
Ratio, seed to straw... 
r—1 
C 3 
P 
l i: 7 
1:6. 4 
1:3. 2 
1:2.3 
1:2.4 
1:3 
1:2.4 
Weight of seed. 
•pH 
f I. A 
1. 6 
2. 8 
2. 8 
O A 
O T 
Weight of straw. 
8 
I, OOO 
8.4 
7. 0 
7.8 
7 - 5 
jS. 4 
6. 0 
6 
5 - 3 
J. 
4. 6 
Ratio, seed to straw... 
0) 
03 
lx:6 
1:4.4 
1:2. 8 
1:2. 7 
1:2. 5 
1:2. 3 
1:2. 2 
Weight of seed. 
Pi 
f *• 7 
!• 9 
2 -3 
2. 9 
2.8 
3 - 2 
2. 9 
Weight of straw.. 
O 
rj 
500 
7 - 7 
9.2 
9 * 5 
7. 6 
7 - 5 
7 - 3 
Ratio, seed to straw... 
I-M 
Pi 
l l: S- 4 
1:4. 1 
1:4 
i- 3-3 
1:2. 7 
1:2.3 
1:2. 5 
Weight of seed. 
• rH 
0 
f 1-3 
2. 0 
2-3 
3 - ^ 
3 - 0 
2. 9 
2. 6 
Weight of straw. 
< 
None. 
8.7 
7.8 
8.0 
7 - 5 
6.6 
7 - 1 
7 - 1 
Ratio, seed to straw... 
li:6. 7 
i: 3 - 9 
■ 
1 ’ 3 * 5 
1:2. 1 
1:2.2 
1:2.4 
1:2. 7 
0 Fertilizers applied, at rate indicated, in 1916, but not in 1917. 
