Sept. 1, 1925 
Thermostasy of Growth of the Date Palm 
437 
Table III. — Interior temperatures of the date palm compared with air and soil 
temperatures of corresponding hours, March 26 to April 1 
Time 
Air 
Soil at 
2 feet 
Bud 
zone 
(by 
ther¬ 
mom¬ 
eter 1) 
Trunk 
(by 
ther¬ 
mom¬ 
eter 2) 
Time 
Air 
Soil at 
2 feet 
Bud 
zone 
(by 
ther¬ 
mom¬ 
eter 1) 
Trunk 
(by 
ther¬ 
mom¬ 
eter 2) 
Mar. 26: 
OJP 
° F. 
°F. 
O p 
Mar. 29—Contd. 
op 
op. 
op 
op 
5.30 a. m_ 
“ 66.20 
_ 
75.20 
78.94 
12.10 p. m_ 
86.90 
71.60 
68.90 
6.30 a. m_ 
66.20 
_ 
76.10 
72.50 
1.05 p. m_ 
89.60 
71.60 
68.90 
9.30 a. m_ 
72.50 
76.28 
73.22 
2.15 p. m_ 
90.50 
66.0 
71.60 
68.90 
10.30 a. m_ 
75.20 
76.10 
70.70 
3.25 p. m_ 
88.70 
_ _ 
70.34 
69.80 
11.30 a. m_ 
80.15 
75.38 
69.98 
4.10 p. m_ 
87.80 
__ 
70.70 
69.80 
1.00 p. m_ 
* 88.78 
75.38 
68.90 
5.00 p. m_ 
86.45 
„ _ _ 
70.70 
69.80 
2.40 p. m_ 
83.30 
73.22 
68.54 
7.00 p. m___ 
75.65 
_ 
71.60 
72.05 
3.45 p. m.-_ 
83.30 
65.0 
72.50 
68.54 
8.00 p. m_ 
70.25 
_ 
72.50 
72.05 
4.30 p. m_ 
82.40 
72.32 
68.36 
9.00 p. m___ 
61, 80 
.. 
73.40 
72.50 
6.30 p. m___ 
71.60 
72.50 
69.80 
Mar. 30: 
7.45 p. m 
70.88 
72.50 
70.70 
5.45 a. m_ 
71.78 
76.10 
73.40 
9.15 p. m_ 
68.45 
72.50 
71.15 
7.30 a. m____ 
79.60 
___ 
77.46 
72 95 
io.oo p m 
67.10 
72.05 
70.70 
8.10 a. m_ 
84 65 
76.55 
72.50 
Mar. 27: 
9.00 a. m_ 
88.70 
. 
75.38 
71.42 
5.50 a. m_ 
62.60 
70.70 
71.60 
10.00 a. m_ 
89.60 
-------- 
74.48 
69.35 
6.30 a. m_ 
63.95 
_ 
70.70 
72.14 
11.00 a. m_ 
92.30 
_ _ 
73.94 
7.17 a. m_ 
66.65 
72.32 
71.60 
12.00 a. m_ 
92.48 
72.95 
68.9§ 
8.00 a. m_ 
69.35 
_ 
74.80 
71.60 
1.00 p. m_ 
92.48 
66.5 
72.05 
68.90 
8.30 a. m 
70.70 
74 30 
70.70 
2.10 p. m_ 
92.30 
71.15 
68.90 
9.30 a. m_ 
72.95 
73.04 
70.25 
3.15 p. m_ 
92.30 
70.34 
68.90 
10.45 a. m_ 
77.00 
72.68 
69.08 
3.50 p. m_ 
89.60 
70.52 
69.08 
11.50 a. m_ 
78.35 
_ 
72.50 
68.54 
4.30 p. m___ 
90.32 
. 
70.34 
69.08 
1.00 p. m.-- 
80.16 
65.5 
72.05 
68.90 
5.30 p. m___ 
85.10 
71.06 
70.25 
2.00 p. m_ 
79.70 
71.60 
67.82 
8.15 p. m_ 
71.60 
72.95 
73.40 
2.30 p. m 
79.52 
70.70 
67.82 
9.00 p. m_ 
71.15 
73.40 
73.40 
3.00 p. m.-_ 
78.35 
69.98 
67.82 
Mar. 31: 
3 50 p m 
78.35 
69.44 
68.54 
5.00 a. m_ 
64 40 
76. 55 
76.55 
4.30 p. m.-_ 
76.55 
68.00 
68.18 
6.30 a. m- 
67.55 
-------- 
77.00 
75.20 
6.10 p. m___ 
70.70 
69.80 
69.35 
8.00 a. m_ 
79.25 
77.00 
73.94 
7.30 p, m 
68 45 
71.42 
70.70 
8.30 a. m_ 
82.85 
76.55 
73.40 
s 30 p m 
65 75 
71.78 
70.70 
10.00 a. m_ 
92.30 
75.20 
71.60 
9.30 p m 
63! 95 
72.32 
71.60 
11.00 a. m_ 
93.20 
74.30 
70.70 
Mar. 28: 
12.10 p. m_ 
93.65 
72.95 
69.80 
6 00 a m 
52. 70 
73.22 
72.82 
1.00 p. m_ 
94.55 
72.50 
69.62 
7.00 a. m 
68.45 
76.02 
71.42 
2.50 p. m.__ 
94.55 
67.0 
70.70 
69.35 
8.10 a. m 
72.50 
74.12 
70.70 
4.00 p. m_ 
95.90 
69.98 
69.35 
9.15 a. m_ 
77.00 
73.40 
69.80 
6.30 p. m.__ 
80.15 
69.98 
69.80 
10.10 a. m_ 
83.75 
72.50 
69.80 
7.30 p. m_ 
76.55 
71.15 
72.50 
11,00 a, m 
84.20 
71.60 
69.35 
8.30 p. m_ 
74.75 
89.80 
73.40 
12.05 p. m_ 
82.85 
71.60 
68.90 
9.30 p. m_ 
73.85 
-- 
73.85 
73.40 
1.10 p. m.__ 
84.65 
65.5 
71.60 
68.90 
Apr. 1: 
2 20 p m 
86 90 
68.90 
68.45 
6.30 a. m_ 
33. 68 
. 
78.86 
76.55 
3 10 p. m 
86.00 
70. 70 
69.80 
7.30 a. m_ 
65.30 
77.90 
76.10 
4.00 p. m_ 
85.10 
70.70 
69.35 
8.15 a. m_ 
68.36 
_ 
77.18 
75.20 
5.00 p. m___ 
81.05 
69.80 
68.90 
9.30 a. m_ 
71.60 
-------- 
76.10 
74.30 
7.00 p. m_-_ 
69.80 
71.15 
71.60 
10.30 a. m_ 
75.65 
_ 
75.20 
73.85 
8,10 p, rn 
64.40 
71.78 
71.60 
11.00 a. m_ 
77.45 
74.75 
73.40 
9.00 p. m___ 
64 94 
72.50 
73.40 
12.00 a. m_ 
78.86 
_ 
73.85 
73.94 
10.15 p. m___ 
71.60 
74.30 
74.80 
1.15 p. m_ 
77.00 
-------- 
72.95 
70. 70 
Mar. 29: 
3.00 p. m-__ 
77.00 
_ 
72.32 
70.70 
5.30 a. m_ 
56.30 
73.40 
72.14 
3.30 p. m.__ 
77.00 
-------- 
72.14 
70.70 
7.20 a. m_ 
76.10 
75.88 
71.60 
4.00 p. m.__ 
75.65 
_ ----- 
71.60 
70.70 
8.20 a. m_ 
78.44 
75.20 
71.42 
5.00 p. m___ 
72.95 
71.42 
71.24 
9.24 a. m_ 
82.40 
73.40 
69.80 
7.00p. m.__ 
65.75 
_ __ 
71.78 
71.78 
10.05 a. m_ 
83.75 
72.50 
69.80 
8.00 p. m___ 
63.95 
-------- 
72.95 
71.60 
11.15 a. m_ 
85.10 
71.96 
69.35 
9.00 p. m_ 
63.50 
— 
73.40 
72.50 
° Figures in bold-face type indicate lowest temperature for the day. 
b Figures in italic indicate highest temperature for the day. 
