Water Use Efficiency and Physiological Response of Rice Cultivars under Alternate Wetting and Drying Conditions

Table 3

Grain yield and water productivity of the four rice varieties grown under two water management treatments and two N rates at the IRRI farm for the three consecutive seasons.

Variety	Grain yield (t ha^−1)				Water productivity (kg m^−3)
	LN		HN		LN		HN
	AWD	CF	AWD	CF	AWD	CF	AWD	CF
2009 DS
IR72	7.45^a	7.80^b	7.74^ab	7.75^b	0.86^a	0.82^ab	0.87^ab	0.83^b
PSBRc80	7.52^a	7.45^b	7.67^ab	8.29^ab	0.87^a	0.78^b	0.87^ab	0.89^a
IR82372H	7.66^a	8.16^ab	8.55^a	9.09^a	0.88^a	0.85^a	0.97^a	0.97^a
SL-8H	7.90^a	8.23^a	7.30^b	8.48^ab	0.91^a	0.86^a	0.82^b	0.91^a
Mean	7.63	7.91	7.82	8.40	0.88	0.83	0.88	0.90
2009 WS
IR72	4.96^a	5.05^a	5.6^a	5.63^a	0.42^a	0.40^a	0.47^a	0.45^a
PSBRc80	5.11^a	4.92^a	5.03^a	5.29^a	0.43^a	0.39^a	0.43^a	0.42^a
IR82372H	4.73^a	4.97^a	5.30^a	5.47^a	0.40^a	0.40^a	0.45^a	0.44^a
Mestizo7	4.64^a	5.12^a	5.22^a	5.34^a	0.39^a	0.41^a	0.44^a	0.43^a
Mean	4.86	5.02	5.29	5.43	0.41	0.4	0.45	0.44
2010 DS
IR72	7.51^a	7.69^b	8.93^a	8.74^b	0.89^a	0.69^b	1.09^a	0.80^b
PSBRc80	7.57^a	7.94^b	8.86^a	9.50^a	0.90^a	0.71^b	1.08^a	0.87^a
IR82372H	7.21^a	7.97^b	8.35^b	8.74^b	0.85^a	0.71^b	1.02^a	0.80^b
SL-8H	7.53^a	8.92^a	8.14^b	9.37^a	0.89^a	0.80^a	0.99^a	0.86^a
Mean	7.46	8.13	8.57	9.09	0.88	0.73	1.05	0.86

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).