ANBAR JOURNAL OF AGRICULTURAL SCIENCES

Abstract

These experiments were conducted in the field of Crop Science Dept., Coll. Of Agric. University of Baghdad, during 2001-2002 and 2002-2003, seasons. The objectives was to study phenotypic and genotypic variation and correlation in bread wheat, using split plot design with ten varieties ( Tamoz 2, Tamoz 3, Abu-Ghraib 3, IPA95, IPA99, Sale, Al-Rashed, Al-Iraq, Fateh and Rabea) as main plots and four seeding rates ( 80, 120, 240 and 320 kg/ ha) as sub plots with three replications.


البحث جزء من أطروحة دكتوراه للباحث الثاني
Increasing seeding rates from 80 to 160, 240 and 320kg/ ha increased phenotypic and genotypic variances of grain yield. Environmental variance reduced for number of spikes/ plant, number of grains/ spike and harvest index in both seasons, while for grain yield reduced in first season and increased in second season. Increasing seeding rates from 80 to 160, 240 and 320kg/ ha, increased positive genetic correlation coefficient for several characters.
It was concluded that the number of spiklets/ spike, harvest index, spike length and number of grains/ spike could be used as selection index for the improvement of grain yield in bread wheat.