Abstract
A field experiment for the comparison among different wheat genotypes (Iqbal-2000, Chenab-2000, Aqab-2000) for its
maximum yield potential in response to different moisture regimes, a randomized complete block design (RCBD) with split
plot arrangement in triplicate run was carried out during the year 2006-07. Factors were: wheat genotypes (Iqbal-2000,
Chenab-2000, Aqab-2000) in main plots and five irrigation levels I0= no irrigation (control), I1= irrigation at tillering, I2=
irrigation at tillering + booting, I3= irrigation at tillering + booting + anthesis and I4= irrigation at tillering + booting +
anthesis + milking in subplots. Results showed that maximum LAI was attained on 2 February and 4 March harvest and
genotype Iqbal-2000 was superior compared to other genotypes. Irrigated treatments significantly increased LAI than control
(I0) treatments at all harvest dates. Iqbal-2000 showed maximum CGR (32.69 g m-2
d
-1
) and LAD (319.42) compared with
lowest CGR (25.49 g m-2
d
-1
) and LAD (278.50) given by genotype Chenab-2000 under I3 and I4 treatments throughout the
growing season. Radiation use efficiency ranged from 17.58-18.27 DM MJ-1
of intercepted radiation. Mean accumulated
radiation interception (754, 736 and 784 MJm-2
) was assessed in genotypes (Iqbal-2000, Chenab-2000 and Aqab-2000),
respectively but not significant effect on net assimilation rate. Genotype Iqbal-2000 and Aqab-2000 had highest TDM
(21670; 21220 kg ha-1
) respectively while I4 (Irrigation at tillering + booting + anthesis + milking) had the highest TDM
22240 kg ha-1
verses I0 (no irrigation) 18070 kg ha-1
. Aqab-2000 showed the highest grain yield (5458.78 kg ha-1
) as
compared to Chenab-2000 (4536.71 kg ha-1
) whereas I4 (Irrigation at tillering + booting + anthesis + milking) produced more
grain yield (6376.25 kg ha-1
) than all other irrigation treatments.
