434 
Journal of Agricultural Research 
Vol. XXXI, No. 5 
Table I .—Interior temperatures of the date palm compared with air and soil 
temperatures of corresponding hours , February 18 to 25 
Time 
Air 
Soil at 
2 feet 
Bud 
zone 
(by 
ther¬ 
mom¬ 
eter 1) 
Trunk 
(by 
ther¬ 
mom¬ 
eter 2) 
1 
Time 
Air 
Soil at 
2 feet 
Bud 
zone 
(by 
ther¬ 
mom¬ 
eter 1) 
Trunk 
(by 
ther¬ 
mom¬ 
eter 2) 
Feb. 18: 
°F. 
o p 
°F. 
°F. 
Feb. 22: 
°F. 
°F. 
0 p 
op 
3.00 p.m- 
57.20 
_ 
60.80 
60.80 
6.30 a. m_ 
57.70 
_ 
60.35 
59.00 
4.00p. m 
55.40 
59.00 
60.80 
8.00 a. m_ 
54.50 
60.35 
59.90 
7.00 p.m- 
48.20 
59.00 
60.80 
5.30 p. m_ 
63.50 
57.6 
62.60 
60.80 
8.35 p.m_ 
44.60 
58.6 
59.00 
59.00 
7.30 p.m_ 
57.20 
_ 
62.60 
60.35 
10.00 p.m- 
42.80 
59.00 
59.00 
9.00 p. m_ 
57.35 
_ 
68.05 
60.80 
Feb. 19: 
10.00 p. m_ 
53.60 
_ 
63.05 
60.80 
6 25 p,, m 
o 26.66 
55.40 
57.20 
Feb. 23: 
9.00 a. m— 
54.50 
52.70 
57.20 
6.30 a. m_ 
68.60 
_ 
62.60 
62.60 
10 30 a m 
57. 56 
52.70 
57.20 
8.15 a. m_ 
60.80 
62.15 
62.60 
11 30 a m 
60.80 
53.60 
57.20 
9.30 a. m_ 
65. 35 
62.60 
61.70 
12.30 p.m- 
59.90 
58.0 
55.40 
57.20 
10.30 a. m_ 
69.35 
57.5 
63.05 
61.70 
1 80p, to 
59.90 
55.40 
57.20 
12.00 a. m_ 
70.70 
63.50 
61.60 
2 30 p m 
b 63.50 
55.40 
56.30 
1.30 p. m_ 
73.40 
63.95 
60.80 
3.30 p.m_ 
60.80 
55.40 
56.30 
3.00p.m.... 
72.95 
_ 
62.60 
60.80 
A Sfl-n m 
59 80 
55.40 
56.30 
4.00p.m. __ 
72.95 
et. 15 
m. 35 
6.00 p.m_ 
55.40 
55.40 
56.30 
5.30 p.m_ 
68.00 
62.15 
60.35 
10.30 p.m_ 
51.80 
_ 
56.30 
56.30 
11.00 p.m_ 
63.50 
_ 
64.40 
61.70 
Feb. 20: 
Feb. 24: 
6 20 a m 
46.40 
56. 30 
57.20 
4.00 a. m_ 
53. @0 
64.40 
62.60 
9 00 a m 
53 60 
56.30 
56.30 
8.00 a. m_ 
58.10 
64.40 
62.60 
in on « m 
58 10 
56.30 
56.30 
10.20 a. m_ 
71.60 
66.20 
68.50 
11 00 a m 
63! 50 
57.20 
56.30 
12.30 p. m_ 
72.95 
66.20 
62.60 
12.00 a. m_ 
63.50 
57.20 
56.30 
2.30 p.m_ 
76.10 
58.0 
64.40 
62.60 
1 no n m 
63. 50 
57.20 
56.30 
3.30 p.m_ 
74.30 
63.50 
61.70 
2.00 p.m_ 
65. SO 
57.5 
57.20 
56.30 
5.00 p.m_ 
70.88 
_ 
62.60 
61.70 
3.10 p.m- 
63.50 
56.30 
56.30 
8.00 p.m_ 
67.10 
_ 
62.60 
61.70 
A 00 r> m 
62 60 
56.30 
56.30 
9.00 p. m_ 
63.95 
64.40 
62.60 
5.00 p.m- 
59.90 
56.30 
55.94 
10.00 p.m_ 
60.35 
_ 
65.75 
63.50 
6.30 p.m_ 
54.50 
57.20 
56.30 
Feb. 25: 
8.00 p.m_ 
50.00 
57.20 
56.30 
5.40 a. m_ 
52.70 
_ 
66.30 
64.40 
o (inn m 
48 20 
58.10 
56.30 
6.25 a. m_ 
52.25 
66.20 
64.40 
in on n m 
46.40 
58.10 
56.30 
9.00 a. m_ 
72.95 
67.10 
64.40 
Fiih 91 • 
10.00 a. m 
72.50 
67.10 
65.80 
X CD* *1- 
ft IK a m 
43.70 
58.55 
57.20 
11.00 a. m_ 
74.75 
67.10 
64.40 
7.00 a. m_ 
43.70 
58.55 
56.30 
12.00 a. m_ 
74.30 
59.0 
66.20 
63.95 
9.45 a. m - 
65.30 
59.00 
56.75 
1.00 p.m- 
76.56 
_ 
65.30 
63.50 
in an a m 
67.40 
59.00 
56.75 
2.00 p.m_ 
74.30 
63.95 
63.05 
11 on a m 
67 55 
59.00 
56.75 
3.00 p. m_ 
76.10 
63.50 
62.66 
12.00 a. m_ 
67] 10 
59.00 
56.75 
4.00 p.m_ 
74.48 
63.95 
62.60 
1.00 p.m_ 
68.90 
58.10 
56. 75 
5.00 p.m_ 
71.60 
_ 
63.95 
62.60 
68 90 
58.10 
57.20 
6.30p.m ___ 
64.40 
64.40 
63.50 
3.00 p. m_ 
67] 55 
57.0 
58.10 
56.75 
8.30 p. m_ 
60.80 
66.20 
63.50 
4.00 p.m_ 
66.65 
_ _ 
58.10 
57.20 
10.00 p.m_ 
59.00 
— 
66.20 
64.40 
6.00 p.m- 
59.45 
_ 
58.55 
56.75 
7.30 p. m- 
61.70 
_ 
59.00 
57.20 
9.00 p.m- 
57.20 
60.80 
58.10 
10.00 p.m- 
57.20 
60.35 
58.10 
° Figures in bold-face indicate lowest temperatures for the day. 
b Figures in italic indicate highest temperatures for the day. 
