Yield of Sunflower (Helianthus annuus L) Influenced by Irrigation and Potassium Levels

The field experiment was conducted during summer 2019 and 2021 at the Main Agriculture Research Station (MARS), University of Agricultural Sciences, Dharwad, Karnataka on medium deep black clayey soils to evaluate the effect of irrigation and potassium levels on sunflower. The treatments included four irrigation regimes (Irrigation at 0.4, 06, 08 and 1.0 IW/CPE ratio) and four potassium levels (application of potassium @ 0, 45, 60 and 75 kg/ha). Results revealed that scheduling of irrigation at 1.0 IW/CPE (2144 kg/ha) and 0.8 IW/CPE (2067 kg/ha) recorded significantly higher on par grain yield as compared to other irrigation levels. Further, application of potassium @ 75 kg/ha (2031 kg/ha) and 60 kg/ha (1983 kg/ha) recorded significantly higher and on par grain yield over other treatments. The combined effect of irrigation at 1.0 IW/CPE with application of potassium @ 75, 60 and 45 kg/ha enhanced the yield attributes and yield as compared to rest of the treatment combination. Irrigation at 0.4 IW/CPE ratio with no potassium application recorded significantly lower growth and yield parameters of sunflower.