494 
Journal of Agricultural Research 
Vol. XXVIII, No. 5 
If the temperatures of 1920 and 1923 at Redfield are compared (fig. 4) it is 
found that when the plantings were made, there was a difference of 8°, 1923 
having the higher temperature. Throughout the growing period there was a 
rather regular alternation of high and low temperatures during both years. The 
rise and fall periods were approximately 10 days in length and were quite notice¬ 
able for the first 50 days. The mean daily temperature of 1920 for the period 
is 671° F., whereas that for 1923 is 70f° F. Taking temperature, moisture, 
and the observations of previous investigations into consideration, it was reason¬ 
able to expect that the damage among the beans would be greater in 1923. 
* 
HOP a Tims. 
1300 
5 
1200 
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EXPLAN; 
01 STORE 
0 MOIST 
K 
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700 
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600 
T 
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■.. ■ 
, REDFIELD MANPAN CHICO LEELAND ARLINGTON 
Fig. 2 .—Chart showing graphically the average differences in yield in grams between the moisture and no 
moisture treatment 
Such, however, was not the case. It is probable, therefore, that moisture added ' 
to the seed before planting is a more potent factor in the stimulation of the 
bean disease than the natural conditions which obtain during the life of the plant. 
Table III .—Seed yields , in grams , from 1923 bean plots 
Redfleld, S. 
Dak. 
Mandan, N. Dak. 
Chico, Calif. • 
Leeland, Md. 
Arlington, Va. 
Treat¬ 
Per 
Per 
Per 
Per 
Per 
ment 
Total 
Clean 
cent 
Total 
Clean 
cent 
Total 
Clean 
cent 
Total 
Clean 
cent 
Total 
Clean 
cent 
yield 
seed 
dis¬ 
eased 
yield 
seed 
dis¬ 
eased 
yield 
seed 
dis¬ 
eased 
yield 
seed 
dis¬ 
eased 
yield 
seed 
dis¬ 
eased 
None., 
622 
543 
12.7 
440 
391 
11.2 
137 
128 
6.6 
1,362 
1,073 
21.2 
704 
. 534 
24.2 
1 . 
512 
422 
17.6 
462 
422 
8.7 
81 
76 
6.2 
982 
775 
21.1 
641 
550 
14 2 
3_ 
481 
402 
16.4 
445 
405 
9.0 
111 
109 
1.8 
1,098 
852 
22.4 
563 
453 
19.6 
6 .. 
729 
604 
17.1 
277 
244 
11..9 
120 
106 
11.7 
1,113 
906 
18.6 
761 
601 
21.0 
8 _ 
637 
480 
24.7 
372 
338 
9.2 
71 
64 
9.9 
1,217 
1,023 
16.0 
720 
559 
22.4 
7_ 
684 
604 
11.7 
382 
352 
7.9 
107 
98 
8.4 
1,326 
1,091 
17.8 
757 
580 
23.4 
4_ 
436 
384 
12.0 
511 
461 
9.8 
106 
100 
5.7 
1,050 
880 
16.2 
558 
428 
23.3 
5_ 
662 
529 
20.1 
370 
322 
13.0 
130 
125 
3.9 
1,124 
907 
19.3 
580 
479 
17.4 
