Water Use Efficiency and Physiological Response of Rice Cultivars under Alternate Wetting and Drying Conditions
Table 5
Growth duration, leaf area index (LAI) at flowering, harvest index, and total dry weight of the four rice varieties grown under two water management treatments and two N rates at the IRRI farm for the three consecutive seasons.
Growth duration (days)
LAI at flowering
Total dry weight (g m−2)
Harvest index (%)
AWD
CF
AWD
CF
AWD
CF
AWD
CF
2009 DS
IR72
104
104
5.49b
5.35c
1481a
1557a
45.5b
46.4c
PSBRc80
106
104
5.56b
5.58bc
1481a
1459b
50.1a
50.1b
IR82372H
100
100
6.63a
6.26ab
1441b
1464b
50.6a
52.2a
SL-8H
106
106
6.82a
6.71a
1478a
1609a
52.1a
52.4a
Mean
104
104
6.13
5.98
1470
1522
49.6
50.3
2009 WS
IR72
101
102
3.16b
3.31a
1089a
1117a
41.7b
42.7c
PSBRc80
103
103
3.30ab
3.53a
1078a
1119a
43.8b
44.3bc
IR82372H
102
102
3.56a
3.50a
1078a
1105a
43.5b
44.9b
Mestizo7
100
100
3.55a
3.71a
1045b
1055a
47.2a
47.1a
Mean
102
102
3.39
3.51
1073
1099
44.1
44.8
2010 DS
IR72
105
106
4.70a
5.15a
1545b
1560a
47.7b
48.1b
PSBRc80
107
107
4.63a
5.40a
1594b
1578a
48.6ab
50.7ab
IR82372H
100
100
4.72a
5.05a
1554b
1631a
50.4a
50.0a
SL-8H
111
111
5.04a
5.01a
1658a
1667a
49.1ab
51.7ab
Mean
106
106
4.77
5.15
1588
1609
49.0
50.1
Data are the means across two N rates. Within a column for each season, means followed by the same letters are not significantly different according to LSD (0.05).