Effect of mycorrhiza and phosphorus applications on yield and yield components in sunflower (Helianthus annuus L.)

This research was planned and carried out in 2024 in the land of Ceylanpinar Agricultural Enterprises Directorate of General Directorate of Agricultural Enterprises located within the borders of Ceylanpinar district of Sanliurfa. In the study, four different doses of mycorrhiza and three different doses of phosphorus were applied to sunflower varieties and their effects on yield and yield elements were investigated. The trial was established in randomized blocks according to the split plots trial design with three replications. Each plot in the trial was formed from 6 rows of 12 m length. Sunflower plants were planted in the trial area with a distance between rows of 70 cm and a distance between rows of 16 cm. A 3 m gap was left between the blocks in the trial. According to the results obtained; it was determined that mycorrhiza and phosphorus applications affected yield in both varieties and caused an increase. In addition, the highest plant height (164 cm), stem diameter (1.81 mm), stem nodes number (28.55-28.50 pieces/plant), head diameter (26.85), dry matter content (67.25%), yield per decare (294.80 kg/da), thousand grain weight (83.8 g), oil content (27.30%) and oleic acid (33.90%), linoleic acid (68%) were determined.