EFFECT OF SUPPLIED NITROGEN FERTILIZERS ON SELECTED GENOTYPES OF SUNFLOWER

Abstract

      A field experiment was carried out in the fields of the College of Agricultural Engineering Sciences- University of Baghdad. This study was conducted to investigate the efficiency of selection to improve some field traits associated with sunflower seed yield and select genotypes that will achieve the best balance between high yield components under conditions of nitrogen deficiency. The experiment included eight sunflower genotypes and three levels of N-supplied (50, 100, and 200) N kg ha^-1. RCBD was used design with split-plot arrangement the sunflower genotypes were allotted as main plots and sub-plots were allotted nitrogen fertilizer rates with three replicates for the autumn season of 2022.The results showed that the selected LD genotype had the lowest plant height of 145.50 cm and the highest yield of 7.92 tons ha^-1. The selected SHS genotype gave a plant height of 146.53 cm, which did not differ significantly from the LD genotype. Selection at adequacy and lack of N-Supplied improved the performance of selected genotypes for the most genetic and phenotypic traits. The LD genotype has been superior, so it is important to include it in genetic and environmental interaction trials in many locations and years.