215 
results of a critical study of the material showed that the estimate made 
in the field, regarding the amount of rust on each plat, was a conser¬ 
vative one. On June 27 and 28 the grain was harvested with a sickle, 
each plat being trimmed down beforehand to 1GJ feet square. Nothing 
further was done with the grain until August 8, when the straw and 
grain were weighed and the latter threshed out with a flail. 
The result of this work is set forth in the following table: 
Table 6 . —Showing weight of straw and grain and weight of grain and of straw from 
each plat. 
Plat. 
Kind of treatment. 
Weight 
of straw 
and grain. 
Weight 
of grain. 
Weight 
of straw. 
1 
Untreated, late plowing. 
23 
7 
15 
5 
.do. . 
23 
7 
15 
2 
Bordeaux mixture, late plowing. 
24 
7 
16 
3 
Untreated, early plowing. 
34 
10 
24 
8 
Bordeaux mixture, early plowing. 
34 
11 
23 
14 
.do. 
32 
10 
22 
7 
Untreated, earlv plowing. 
31 
9 
21 
10 
Ammoniacal sol tion.latc plowing. 
28 
9 
19 
11 
Untreated, late plowing. 
17 
5 
8 
4 
Ammoniacal solution, early plowing. 
35 
9 
25 
13 
Untreated, early plowing. 
29 
8 
20 
* 16 
Ammoniacal solution, late plowing. 
24 
8 
15 
19 
Untreated, late plowing. 
15 
5 
9 
12 
Potassium sulphide, late plowing. 
19 
6 
13 
9 
Untreated, late plowing. 
20 
7 
13 
18 
Potassium sulphide, early plowing. 
33 
10 
23 
15 
Untreated, late plowing. 
20 
G 
13 
6 
Potassium sulphide, late plowing. 
25 
7 
17 
17 
Untreated, early plowing. 
32 
9 
23 
The plats are arranged so as to bring those plowed early and late to¬ 
gether, for the sake of more conveniently comparing them. A study of 
the figures reveals the fact that there are no very striking differences 
in favor of any of the treatments. Comparing the total yield of plats 
8 and 14, sprayed with Bordeaux mixture, plowed early, with the 
the yield of plats 3 and 13, the nearest untreated plats, plowed early, 
it is seen that there is an increase of 3 pounds in the total yield and 
3 pounds in the yield of grain in favor of the spraying. Plat 2, 
treated with Bordeaux mixture and plowed late, yielded only 1 pound 
more straw than plat 1, untreated. Compared with untreated plat 
9, however, plat 2 yielded 3 pounds more straw for the same amount 
of grain. Where the plats were sprayed with the ammoniacal solution, 
there was an increase in every case of the treated over the untreated; 
in fact, the difference, between the sprayed and unsprayed plats 
was here more striking than where Bordeaux mixture was used. It 
is doubtful, however, if this increase was due to the prevention of 
rust, for, as shown in Table 5, these plats were almost as badly rusted 
as the untreated. It is barely possible that the increased yield was 
due to the fertilizing effect of the ammoniacal solution on the soil. The 
plats sprayed with potassium sulphide gave about the same amount 
of increase as those treated with the ammoniacal solution. There is no 
apparent reason for believing that the increase was due to the preven¬ 
tion of rust. On the other hand, there is some proof that increased 
fertility of the soil, due to the application of the potassium sulphide, 
• ' 
