Agriculture Reference
In-Depth Information
Cooling Index
Fig. 47 Changes in sterility percent with cooling index.
Table 43 Effect of day and night temperatures on spikelet sterility at heading
time of rice (after Shibata et al. 1970)D.
Duration of low
temperature
Day
temperature
ºC
Night
temperature
ºC
Spikelet
sterility(%)
Flowered
spikelets(%)
at heading
Days
Booting
stage
Heading
time
26
20
3.7
9.9
95
14
6.4
19.4
36.7
8
22.5
41.6
13.3
6
20
20
6.1
11.5
91.7
14
6.6
15.5
18.3
8
28.0
37.4
1.7
14
20
7.0
14.6
38.3
14
25.8
21.1
7.0
8
74.8
48.3
1.3
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