16 
BULLETIN 1383, U. S. DEPARTMENT OF AGRICULTURE 
Table 9. — Individual and average percentages of emergence and yields of two lots 
of smut-free wheat from seed untreated or treated with hot water, as specified, and 
grown at Arlington Experiment Farm in 1928-24 
[The treated seed was sown at the same rate as the untreated seed, 6 pecks per acre, or plus an allowance to 
compensate for the reduction in germination. The loss or gain shown in the last column is calculated 
hum i lir interpolated yield of the untreated control, which is given in parentheses] 
Treatment of the seed 
Per- 
cent- 
age of 
germi- 
nation 
Rate of 
sowing 
(Decks) 
Acre yields (bushels) 
Variety and plat 
Method 
Tem- 
pera- 
ture 
(° CO 
Duration 
Actual 
Loss (-) 
or gain (+) 
llr. 
Min. 
from 
treated 
seed 
Mammoth Red (C. I. 
2008): 
No. 1_ 
Border plat 
0.0 
0.0 
6.0 
17.5 
6.0 
6.0 
•6.5 
6.0 
17.0 
6.0 
6.0 
6.0 
1 7.0 
6.0 
6.0 
17.0 
6.0 
»6.5 
6.0 
0.0 
No. 2 
Untreated 
84 
68 
68 
79 
84 
79 
73 
73 
84 
92 
81 
81 
77 
92 
77 
88 
92 
47.3 
42.4 
41.8 
41.0 
39.3 
37.7 
37.9 
38.4 
34.4 
35.0 
32.4 
35.6 
38.5 
43.0 
40.6 
42.2 
44.0 
49.0 
No. 3.. 
-2.9 (45.3) 
Xo. 4. 
No. 5 
do. 
Single bath 

""49" 
..... 
35" 
-1.5(43.3) 
-0. 3 (41. 3) 
No. 7... . 
Single bath 
do 
do 
Untreated 
49 
48 
48 
1 
1 
1 
35 
50 
50 
- . 3 (38. 0) 
No. 8 
No. 9.- 
No. 10 
+1.1 (36.8) 
+2. 8 (35. 6) 
Poole (C. 1. 3489): 
No. 11 -- 
do.. 
Modified 


No. 12 
-4. 6 (37. 0) 
No. 13.... 
do.. 
-3. 4 (39. 0) 
No. 14 
Single bath.... 
49 
1 
35 
-2.5(41.0) 
No. 15 
No. 16 
No. 17 
No. 18 
Xo. 19 
Single bath... 
do 
do... 
led 
49 
48 
48 
1 
1 
1 
50 
50 
-3. 9 (44. 5) 
-3. 8 (46. 0) 
-3. 5 (47. 5) 
No. 20 
1 The drill used could not be adjusted to differences in rates less than one-half peck. The compensated 
rates as calculated were therefore adjusted to the nearest half-peck rate. All of them are slightly higher 
than the calculated rate. 
Table 9 shows that plants from untreated seed outyielded those 
from treated seed in 10 cases out of 12. The average yield of all of the 
plants from seed treated at 48° C, 49°, and by the modified method, 
respectively, was 0.7, 1.9, and 3.3 bushels per acre less than the 
average yield of all of the plants from seed not treated (41.3 bushels 
per acre). 
When treated wheat was sown at an increased rate, so that the 
quantity of viable seed sown was the same as that of untreated 
wheat, the average yield still was less by 1.65 bushels per acre than 
that of all plants from seed not treated. These data suggest that 
the injurious effects of hot-water treatments may extend beyond 
the germination period and into the later stages of plant growth. 
For the years 1922 and 1924 (yield tests were not conducted in 
1923) the average acre yields of plants from untreated and treated 
seed were as follows: 
Bushels 
Seed not treated 37. 5 
Seed treated by the modified method 32. 3 
Seed treated at 48° C. for 1 hour and 50 minutes 36. 4 
Seed treated at 49° C. for 1 hour and 35 minutes 36. 5 
METHODS OF APPLYING SINGLE-BATH TREATMENTS 
The data presented in the foregoing pages show that better results 
were consistently obtained from some of the single-bath treatments 
