The effect of potassium application in different doses onyield and quality characteristics of sunflower undersustainable conditions

The aim of the study is to determine the effect of different doses of potassium application on the yield and quality characteristics of sunflower. The field trials were conducted in the 2019 summer growing season under sustainable conditions (farmer conditions) at two different locations including Mahramlı District of Tekirdağ and Yeniceçiftlik Village of Keşan, Edirne. Roseta Sunflower variety cultivated in Thrace Region was used as trial seed material in the study. In the study, 6 different potassium doses including 0, 3, 6, 9, 12 and 15 kg / da, as potassium sulphate (K2SO4) fertilizer containing 51 % K2O (0-0-51%) was used. In addition, to meet the nitrogen and phosphorus need of the plant; 20 kg per decare. NP 20-20-0 fertilizer was used. As a result of the study, no significant difference was observed in oil ratio, plant height, diameter and seed humidity at harvest parameters for different potassium applications. On the other hand, different potassium dose applications had significant effects on seed yield, de-hulled/hulled seed weight. 100 seed weight, biological weight and oil yield. The highest seed yield was 347.90 kg / da at the potassium dose of 9 kg / da in the Yeniceçiftlik location, and 401.79 kg / da at the potassium dose of 6 kg/da in the Mahramlı location; the highest de-hulled/hulled seed weight was 74,48 % at the 6 kg / da potassium dose in the Mahramlı location; the highest 1000 seed weight was 56.43 g at the potassium dose of 6 kg / da in the Yeniceçiftlik location and was 66.61 g at the potassium dose of 6 kg/da in the Mahramlı lication; the highest biological weight was 520.54 g/plant at the potassium dose of 6 kg/da in the Yeniceçiftlik location. and 544.60 g at the potassium dose of 6 kg /da in the Mahramlı location, and the highest oil yield 156.13 kg/da at the potassium dose of 9 kg / da in the Yeniceçiftlik and 191.84 kg/da at the potassium dose of 6 kg/da in the Mahramlı location. Keywords: Sunflower, biological weight, potassium, seed yield, oil yield