Abstract

This experiment had been conducted at directorate of agriculture research in
sulaymaniyah province for two winter growing seasons 2019/2020/ and 2020/ 2021. The
experiment was on three bread wheat varieties ( Sulaymani2, Wafia and Rizgary)with three
rates of seeding (30, 40, 50)kg/ donum. This experiment was carried out by using Randomized
Complete Block Design (RCBD) in Factorail experiment with three replications. The aim of
this study was to indicate the best wheat seeding rate under sulaymaniyah environment. The
result of combined analysis of variances show that the interaction between varieties and years
was highly significances of all traits despite the seed yield and biological attributes. Effect of
years doesn’t shown any significance of seed yield and number of seed per spikes, but the
interaction between seed rate and varieties (seed rate x varieties) and (seed rate x varieties x
years) doesn’t show any significance of variations despite of specific weight of seeds show
significance in three interactions. Rizgary variety was show high significance comparing, by
other two varieties. In the interaction between varieties, seed rate and years, Rizgary show
highest plant and higher biological yields by 88.73 cm, 13.437 ton/ hectare-1, 44.5gm weight of
1000 kernel and 82.16 kg. hectoliter. On the other hand ( Sulaymani2 variety show higher seed
yield by 3.873ton/ hectare comparing by other two varieties. Also, Wafia variety show high
seed number per spikes by 59.66 seed and protein ratio by 17.87% comparing by ( Sulaymani2
and Rizgary varieties. Regarding the seed rate in this study 50 kg /donum seed rate was shown
high significance in all components yield, seed ingredients, hectoliter, yield and test weight
comparing by other two seed rates. The three interaction and two interactions of seed rates and
variety traits indicate the stability of variety in two years . The study result indicates that (
Sulaymani2 and Rizgary varieties were shown significances of 50 kg/ donum than 40 kg and
30 kg per donum.