Table 1.

The mean performances of DK151 and IR64 for grain yield and related traits under drought stress and non-stress conditions evaluated in three consecutive seasons

Season	Genotype	Treatment	Yield (t/ha)a	HD (d)	PH (cm)	PN	GN	SF (%)	GW (g)
2004 DS	DK151	Stress	0.39*	83.7**	56.0	13.7	–	43.1*	–
	IR64	Stress	0.12**	91.1*	54.8	14.0	–	37.8**	–
	DK151	Control	3.59	76.3**	78.6	21.7	–	79.3**	–
	IR64	Control	3.58	81.1*	78.6	20.3	–	86.6*	–
2004 WS	DK151	Stress	1.61*	74.0**	82.2*	12.3	145.0*	69.4*	25.9*
	IR64	Stress	0.09**	81.7*	77.6**	11.5	47.9**	27.2**	17.2**
	DK151	Control	3.99**	74.7**	93.5	17.2	135.7	83.9	27.6*
	IR64	Control	4.83*	80.1*	93.5	19.0	136.0	84.1	25.0**
2005 DS	DK151	Stress	5.97*	–	–	–	178.7*	76.6*	25.7*
	IR64	Stress	2.98**	–	–	–	48.8**	62.1**	20.1**
	DK151	Control	3.23**	–	–	–	121.5**	85.6	27.9*
	IR64	Control	4.21*	–	–	–	143.1*	88.5	25.0**

^aHD, PH, PN, GN, SF, and GW are heading date, plant height, panicle number per plant, filled grain number per panicle, spikelet fertility, and 1000 grain weight, respectively.

* or ** after the mean trait values of DK151 and IR64 indicate statistically significant difference at P < 0.01.