Document Type : Research paper
Department of Agronomy, Rodehen Branch, Islamic Azad University, Rodehen, Iran.
Department of Agronomy, Jouybar Branch, Islamic Azad University, Jouybar, Iran.
In order to study the effect of fertilizer and crop density on some agronomic traits in sunflower, a field experiment was carried out as a split-plot based on randomized complete block design with three replications in the Agricultural Research Farm of Dasht-e-Naz in Sari, Iran. Main plots included four fertilizer treatments (N0p 0K0, N23p 25K25, N46p 50K50 and N69p 75K75) and sub-plots included four plant densities (D50= 50000, D60= 60000, D70= 70000, and D80= 80000 plant ha-1). The results indicated that there was a significant difference in grain yield, biological yield, kernel, and oil yield (p < 0.01) and individual biological yield and the number of empty rows (p < 0.05) by plant density. There was a significant difference in grain kernel ratio (p < 0.05) by fertilizers. F2 and F1 had the maximum and minimum grain kernel ratio with 77.40 and 76.30%, respectively. D50 and D80 had the lowest and highest grain yield with 5666 and 3633 kg/ha, respectively. Biological yield in D60 was the lowest but in D80 was the highest with 10853 and 16460 kg/ha, respectively.D60 and D50 had the lowest and highest individual biological yield with 180.90 and 225.90 g/plant, respectively. The maximum and minimum grain yield was obtained in F3 (4817 kg/ha) and F2 (3968 kg/ha), respectively.
- Grain and oil yields had significant differences by plant density and there was a significant difference in the effect of fertilizer only on the grain kernel ratio.
- Cultivar Master of sunflower should be sown in high plant density with fertilizer application N69P75K75was obtained the maximum grain and oil yields.
- In the condition of low plant density, because being of enough nutrients sinks was a limitation and in the condition of high plant density, the source was a limitation that decrease of yield component indicates.