12 
BULLETIN 1383, U. S. DEPARTMENT OF AGRICULTURE 
Some of the facts brought out in Table 6 are: (1) That all of the 
treatments completely controlled loose smut except those at 47° C. 
for 2 hours and 2 hours and 15 minutes, and at 48° for 1 hour and 40 
minutes, these treatments reducing the amount of loose smut to a 
trace; (2) that the plants from untreated seed outyielded those 
from any of the treated seed, although three of the lots (Nos. 16, 17, 
and 19) contained a relatively high percentage of loose smut; (3) 
that plants from seed given any of the single-bath treatments out- 
yielded plants from seed treated by the modified method; (4) that 
some of the single-bath treatments, especially those at 48° C. for 
1 hour and 40 minutes and at 49° for 1 hour and 35 minutes, reduced 
the yield only very slightly; (5) that increases in the duration of 
treatment as short as 10 minutes at 48° C. were accompanied by 
decreases in yield; and (6) that without exception the average yields 
for the five lots of plants from untreated seed and from seed given 
any of the treatments were higher on the west sections than on the 
east sections of the plats, indicating less favorable soil conditions on 
the east sections. It is noteworthy that this reduction amounted to 
only 1.3 bushels per acre in plants grown from untreated seed and 
to approximately two to four times this amount in plants grown 
from treated seed. The greatest reduction occurred in plants from 
seed treated by the modified hot-water method. In the absence of 
data on the germination of untreated and treated seed, it is impossible 
to state whether this reduction was due to a decreased emergence of 
seedlings from the treated wheat or to a lessened post-germination 
capacity on the part of the plants which developed from treated wheat 
or both. It is evident, however, that the soil conditions under which 
the treated seed is sown may play an important part in the complex 
of factors which eventually determine the effects of treatment on 
yield. 
Table 7. — Test weight per bushel of wheat of five different lots grown from seed 
untreated or treated with hot voter, as specified, and sown in the field at Arlington 
Experiment Farm October 21, 1921 
Treatment of the seed 
Bushel weight (pounds) 
Kind and tempera- 
Duration 
Lot 16, 
Goens 
Lot 17, 
Goens 
Lot 19, 
Goens 
Lot 26, 
Ful- 
caster 
Lot 27, 
Purple- 
straw 
A verage 
ture 
Hours Minutes 
55.00 
55.20 
54.36 
53.85 
54.50 
54.45 
54.40 
54.00 
53.25 
54.45 
54.45 
54.10 
54.10 
54.00 
55.30 
54.80 
54.70 
54.35 
54.81 
54.55 
53.19 
54.45 
54.75 
54.70 
55.40 
51.25 
51.55 
51.35 
50.62 
51.00 
50.85 
50.94 
51.19 
50.85 
50.90 
50.80 
55.60 
55. 50 
55.50 
55.30 
55.30 
55.50 
55. 30 
54.00 
55.60 
55.25 
54.50 
54.20 
54.31 
Single-bath method: 
1 1 
54.07 
At 47° C . 
15 
30 
54.75 
54.30 
53.88 
53.88 
1 I 
I ! 
45 
.54. 56 
54.40 
55.00 
55. 30 
55.10 
55.30 
53.74 
53.66 
At 48° C 
40 
50 
53.82 
54.12 
1 ? 
54.01 
At 49° C 
35 
54.00 
Pipal (13) states that apparently beneficial effects other than smut 
control are obtained through treatment of the seed by the modified 
hot-water method. For example, plants from treated seed in many 
cases produced heavier, plumper grain than plants from untreated 
seed. In order to determine the effect of the different treatments 
