362 
Journal of Agricultural Research 
Vol. XXVII, No; 6 
given in Table IX. At first, it appears that there is a definite correlation 
between the amount of stem rust and the kind of fertilizer applied. 
The highest average percentage of rust on Marquis was on the plats 
which had received sodium nitrate at the rate of 1,000 pounds per acre, 
the next highest on those which had received 500 pounds, and the third 
highest, on those which had received 250 pounds. There appears, 
therefore, to be a direct correlation. The higher percentage of rust in 
these plats was due partly, at least, to delayed maturity, as the plants 
matured a week or 10 days later than did those in the other plats. The 
density of stand also no doubt made it possible for the rust to develop 
more abundantly, as the plants lodged badly and moisture was retained 
much longer than on those plants which did not lodge. (See PI. 1,2, 
and 3.) 
Table IX.— The disposition of the commercial fertilizers and the percentages of stem rust 
on Marquis and the hybrid, and the percentages of yellow-berry, seed shriveling, lodging , 
and the acre yields of Marquis in igiy in the plats on University Farm, St. Paul, Minn. 
Infection, yellow-berry, seed shriveling, 
lodging, and yield. 
Percentage of stem rust, Marquis... 
Percentage of stem rust, hybrid__ 
Percentage of yellow-berry, Marquis. 
Percentage of seed shriveling, Mar¬ 
quis... 
Percentage of lodging, Marquis 
Bushels per acre, Marquis. 
Percentage of stem rust, Marquis... 
Percentage of stem rust, hybrid. 
Percentage of yellow-berry, Marquis. 
Percentage of seed shriveling, Mar¬ 
quis. 
Percentage of lodging, Marquis. 
Bushels per acre, Marquis. 
Percentage of stem rust, Marquis... 
Percentage of stem rust, hybrid. 
Percentage of yellow-berry, Marquis. 
Percentage of seed shriveling, Mar¬ 
quis.. 
Percentage of lodging, Marquis. 
Bushels per acre, Marquis. 
Percentage of stem rust, Marquis... 
Percentage of stem rust, hybrid._ 
Percentage of yellow-berry, Marquis. 
Percentage of seed shriveling, Mar¬ 
quis. .. 
Percentage of lodging, Marquis. 
Bushels per acre, Marquis. 
Fertilizer. 
Kind. 
Amount 
aJ 
Z 
5 ? 
2 
C8 
■g. 
•a 
Fertilizer, kind and amount (pounds) 
per acre. 
Sodium nitrate. 
None 
acre. 
1,000 
500 
250 
1,000 
500 
250 
Pounds. 
1 
55 
33 
31 
33 
28 
29 
28 
17 
8 
7 
6 
7 
4 
2 
0 
0 
50 
50 
80 
90 
90 
2,000 
70 
70 
15 
0 
0 
0 
0 
100 
80 
60 
0 
0 
0 
0 
,12.8 
14.1 
28.2 
35-3 
24-3 
21.7 
22.0 
60 
37 
35 
33 
3 2 
3 i 
26 
11 
19 
6 
6 
7 
6 
5 
0 
0 
10 
75 
70 
80 
80 
1,000 
70 
60 
15 
0 
0 
0 
15 
100 
90 
40 
20 
0 
0 
0 
.i 5 - 8 
17*5 
31.S 
30-5 
26.9 
2 5-9 
2 3-9 
( 6 5 
37 
37 
3 2 
34 
3 i 
2 7 
10 
10 
5 
6 
6 
8 
2 
0 
0 
5 
40 
70 
60 
90 
5 °° 
30 
30 
20 
0 
0 
0 
0 
100 
90 
80 
30 
0 
20 
0 
,18.6 
20.7 
26.1 
3 2 *4 
00 
d 
<0 
35-7 
32.6 
67 
35 
3 8 
28 
32 
3 i 
2 5 
9 
8 
4 
5 
7 
6 
1 
0 
0 
5 
40 
60 
75 
70 
None. 
40 
30 
i 5 
i 5 
0 
0 
0 
80 
80 
60 
0 
0 
0 
0 
.14.7 
22.0 
25.8 
40.8 
33 - 2 
3 2 - 5 
29.6 
Potassium sul¬ 
phate residual.® 
a Fertilizers applied, at rate indicated, in 1916, but not in 1917. 
