|
|
ASSESSMENT OF ADAPTABILITY AND STABILITY OF GRAIN YIELD IN BREAD WHEAT
GENOTYPES UNDER DIFFERENT SOWING TIMES IN PUNJAB
JAVED ANWAR*, MUJAHID HUSSAIN, MUHAMMAD AMJAD ALI, MAKHDOOM
HUSSAIN, MUHAMMAD SALEEM,
GHULAM
MAHBOOB SUBHANI,
JAVED AHMAD AND MUHAMMAD MUNIR
Abstract: Twenty
advanced lines/genotypes of wheat including two check varieties were
sown under two different sowing times through out the Punjab province at
18 different locations with diverse environments to study their
stability and adaptability. Normal sowing was done in second week of
November 2007 while the delayed sowing was completed during second week
of December 2007 during crop season 2007-08. The pooled analysis of
variance showed significant differences among environments and genotypes
for grain yield demonstrating the presence of considerable variations
(p<0.01) among genotypes as well as diversity of growing environments at
various locations for both normal and late sown wheat crops. The highest
average grain yield was obtained at Jalandar Seed Farm, Arifwala and
Pak. German Farm, Multan for normal and delayed sown crops,
respectively. Most of the locations emerged as high yielding in normal
sowing compared to late sown crop. Dendrograms of 18 locations based on
the average yield of 20 wheat genotypes grown under normal and late sown
crop revealed two main clusters. Under both normal and late sowing, none
of the varieties exceeded the check Seher-2006, however, the check was
followed by the advanced lines V-04022 and V-05066 for normal sown crop
and Shafaq-2006, V-05066 and V-04022 under delayed sowing. All the
genotypes revealed decline in grain yield for late sown wheat crop. The
analysis of stability based on mean grain yield, regression coefficient
and deviation from regression advocated that the cultivars V-05066 and
V-03BT007 were most stable and adapted to diverse environmental
conditions of Punjab. These cultivars revealed unit regression and
non-significant deviations from regression. The check variety Seher-2006
produced maximum yield for both sowing times that suggested its
consistent and stable performance across the environments.
Wheat Research Institute, Ayub Agricultural Research Institute (AARI),
Jhang Road, Faisalabad, Pakistan
|
|
|