Oct. 6, 1923 
Temperature of the Leaves of Crop Plants 
33 
examined show a temperature slightly lower than that of the surrounding 
air. This fact is shown by the leaves of corn and the sorghums in one 
or two examples in Tables IV and V. The effect of mild climatic con- 
TablE V —Temperature of the upper surface of the leaves of plants during the day and 
night 
PART I 
Evapora¬ 
tion. 
Number 0 
determi¬ 
nations. 
I Average temperature (°C.) of— 
Time. 
Air. 
Corn, 
Pride of 
Saline. 
Milo, 
Dwarf. 
Cowpeas, 
New Era. 
Soybeans, 
Medium 
Yellow. 
July 18: 
Cc . 
9.25 to 9.40 a. m.. 
0. 6 
20 
2 7 - 5 
28. 3 
27. 5 
9.45 to 10.10 a. m. 
.8 
20 
28. 4 
28. 7 
28.5 
11.15 ton.30a.rn. 
.8 
20 
29. 3 
29.9 
2 9 - S 
11.3ston.55a.1n. 
• 9 
20 
30 - 7 
3 2 - 4 
30-4 
30. 6 
1.10 to 1.25 p. m. 
•9 
20 
3 i- 9 
32. I 
2.00 to 2.20 p. m. 
1. 4 
20 
3 2 - 7 
3 2 - 3 
33-5 
3.10 to 3.27 p. m. 
i -3 
20 
32. 1 
31. 6 
3 2 - 4 
3.40 to 4.00 p. m. 
. 7 
20 
33 -o 
26.8 
33 - 1 
33 -o 
5.50 to 6.05 p. m. 
6.10 to 6.25 p. m. 
•4 
20 
26. 2 
26. 1 
• 3 
20 
26. 9 
25. 8 
2 5 - 3 
7.20 to 7.40 p. m. 
. 1 
20 
22. 2 
21. 3 
21-5 
7.45 to 8.00 p. m. 
• °5 
20 
21. 9 
T 9 ‘ 5 
19. 4 
21.4 
19. 6 
9.00 to 9.20 p. m. 
• °5 
IO 
4L. 4 
i 9 - 7 
9.25 to 9.40 p. m. 
IO 
19. 1 
17.7 
19.1 
17.9 
11.00 to 11.25 p.m. 
h 
IO 
17. 9 
i 7-5 
17-3 
17. 2 
11.30 to 11.40 p.m. 
h 
IO 
r 7 - 5 
17-3 
i 7-5 
17-3 
July 19: 
1.05 to 1.15 a. m.. 
IO 
1.20 to 1.30 a. m.. 
h 
IO 
17. 0 
16. 5 
17.1 
16. 6 
3.10 to 3.20 a. m.. 
0 
IO 
16. 6 
3.30 to 3.40 a. m.. 
(!) 
IO 
16. 5 
16. 6 
16. 2 
16. 6 
16. 0 
5 -°St° 5 -i 5 m-. 
5.15 to 5.25 a. m.. 
m 
IO 
16. 2 
w 
IO 
16. 1 
16. 0 
16. 0 
7.00 to 7.10 a. m.. 
0 
IO 
d d 
N Cl 
20. 6 
20. 5 
7.12 to 7.22 a. m.. 
0 
IO 
20. 5 
part 2 
Evapora¬ 
tion. 
Number of 
determi¬ 
nations. 
Average temperature (°C.) of— 
Time. 
Air. 
Cowpeas, 
New Era. 
Pumpkin, 
Cheese. 
Water¬ 
melon, 
Cobs Gem. 
Sudan 
grass. 
July 26: 
Cc. 
10.10 to 10.20 a.m. 
°-3 
IO 
35 - 0 
35 -o 
35-3 
11.25to 11.35 a.m. 
• 4 
10 
37*6 
35 - 1 
39-8 
37-8 
1.08 to 1.18 p. m. 
8.05 to 8.15 p. m. 
•4 
IO 
35-3 
35*5 
. 1 
IO 
24. 2 
22. 8 
24. I 
8.20 to 8.30 p. m. 
. 1 
IO 
22. 6 
22. 5 
24. O 
io.ioto 10.20 p.m. 
0 
IO 
21.8 
! 21. 8 
21-5 
10.30 to 10.40 p.m. 
(*) 
IO 
21. 7 
! 
! 
21. 6 
, 
July 27: 
! 
21. 0 
12.20 to 12.30a.m. 
IO 
22. I 
22. I 
22. I 
12.35 to 12.45 a.m. 
)l\ 
IO 
22. I j 
21.8 
21.8 
2.10 to 2.20 a. m.. 
C) 
10 
21.8 
21. 7 
21. 7 
2.20 to 2.30 a. m.. 
h\ 
IO 
21. 8 
21. 7 
O T T 
21. 9 
4.10 to 4.20 a. m.. 
(!) 
IO 
21. I 
4.20 to 4.30 a. m.. 
6.05 to 6.15 a. m.. 
6.20 to 6.30 a. m.. 
r> 
IO 
21. O 
20. 7 
20. 8 
21. 4 
*) 
IO 
20. 6 
20.3 
20. 2 
0 
10 
21.3 
21 . 2 
20 . Q 
-3 * 
60372 — 2 : 
1 No evaporation. 
