Performance and variances for bread wheat genotypes under different levels of seeding rates

الملخص EN

The effect of seed rates (100, 120 and 140 kg/ha) on grain yield and some of its components, (number of grains per spike, 1000-grain weight), plant height number of days to the flowering and leaf area of 16 introduced bread wheat genotypes along with local one (Azady) was investigated at the agronomic research station of Faculty of Agriculture and Forestry, Duhok University, during 2011-2012 season, and the 16 genotypes excluding local one were evaluated during the two seasons (2010-2011 and 2011-2012) under seed rate of 140 kg/ha, using randomized complete block design with three replications.

The effect of seed rates, seasons and genotypes was significant for all characters except 1000-grain weight in case of seed rate.

Genotype x seed rate and genotype x season interactions were highly significant for all characters except number of days to flowering for genotype x seed rate.

Plant height, number of day to flowering, 1000-grain weight and grain yield were high at higher seed rate of 140 kg/ha, while number of grains per spike and leaf area were high at lower seed rate of 100 kg ha.

Among wheat genotypes, SETTAT-85, SALE-7 and KHEMISSET-1 produce higher plant height and grain yield/ha, SETTAT-85 surpassed others for number of days to flowering and JAWAHIR-13 and KHEMISSET-1 produce maximum 1000-grain weight.

In interaction, maximum grain yield 5.647 ton/ha was produced by SETTAT-85 with seed rate of 140 kg/ha, and 8.194 ton/ha was produced by KHEMISSET-1 in 2010-2011 season.

Broad sense heritability was high for plant height and moderate for number of days to flowering, and low for other characters.