Recurrent Selection for General and Specific Combining Ability in Maize

The study was conducted to investigate the response of four maize cultivars to potassium fertilization. The research was conducted in the center of Ramadi city, Anbar Governorate, in the fields of one of the farmers during the spring and autumn seasons of 2023. A factorial experiment was conducted according to randomized complete blocks design with four replicates. The potassium levels were (0, 100, 200) kg ha-1, and four cultivars (Rabi, Al-Maha, Baghdad, 5018). The results showed that the Al-Maha cultivar outperformed in grain yield (7.58 tons ha-1), highest weight of 300 grains (83.31 g in the spring season), and Baghdad cultivar for the autumn season at 8.90 tons ha-1, as well as highest number of grains per ear (789.4 grains). The potassium fertilizer level of 200 kg.ha-1 achieved early female flowering (silking), highest plant height, leaf area, number of grains per ear, and grain yield in both seasons. There was a significant interaction between the cultivars and potassium fertilizer levels in all traits except for the weight of 300 grains.

Response of Several Maize Cultivars to Potassium Fertilizer Levels

Abdulkareem,

Aoad,

AL-Jabbar Salih

et al. 2024

The Growth and Yield of Oat Cultivars Influenced by Kinetin Application

Saleh,

Abdulkareem,

Shahatha

et al. 2024

A field experiment was conducted during the winter season (2021-2022) at the College of Agriculture Research Station - Anbar University, located at longitude 43.39 and latitude 33.44, to study the effect of foliar nutrition with kinetin on some growth and yield traits of oat cultivars. In this study, a split-plot design according to RCBD with three replications was used. The main plots included kinetin levels (0, 50, 100, and 150) mg L-1, while the cultivars (Al-Juda, Carlup, Genzania) were allocated to sub-plots. Oat cultivars differed significantly in most of the studied traits. The Carlup cultivar recorded the shortest duration to reach the physiological maturity stage and the highest plant height (118.01 cm), leaf area, average number of tillers per unit area, chlorophyll content, and grain yield (5.38 tons ha-1). Kinetin application improved the studied vegetative growth traits, yield, and its components. The concentration of 150 mg L-1 outperformed in most of the studied traits such as chlorophyll content, leaf area, number of tillers, and grain yield (5.73 tons ha-1), and did not differ significantly from the concentration of 100 mg L-1. A significant interaction effect between cultivars and kinetin concentrations was found in most of the studied traits. Plants of the Carlup cultivar sprayed with a concentration of 150 mg L-1 achieved the highest average grain yield of 5.96 tons ha-1.

Efficiency of the RAPD Molecular Indicator to Determine the Genetic Polymorphism of Flax Genotypes

Oudah,

Abdulhamed,

Hammadi

2024

An experiment was carried out during the winter season 2022-2023, using ten genotypes of flax (2 Sakiha, 5 Sakiha, 7 Sakiha, 8 Sakiha, 9 Sakiha, Giza 3, Giza 4, Giza 5, Pure line 107, and Blanka). To determine the genetic fingerprint of flax genotypes. RAPD markets were used to evaluate genetic polymorphism ce between 10 genotypes of flax. All 11 primers produced 142 bands, at a rate of 11.83 bands per primer. The number of polymorphism t pieces ranged between 15 for primer UBC556 and 9 for primer A82, with a molecular weight that ranged between 400-2250 bp. The total number and percentage reached For dissimilar pieces, 125 and 88.08%, respectively. The highest percentage of discrepancies reached 100% for primers UBC604 and B24. Based on the binary data, genetic similarity, and the relatedness chart, the flax genotypes were separated into major and secondary groups. Analysis of the groups under the comparison ratio of the combinations within the relatedness chart showed that the variety Sakiha 5 with the structure Giza 4 and the structure Pure line 107 gave the highest genetic dimension, reaching 0.90 and 0.88, respectively. Perhaps this will be reflected in the flax later. The results indicated that RAPD parameters are highly efficient in diagnosing purity and genetic polymorphism between flax genotypes, so efficient selection of subsequent generations is possible.