Abstract
Irrigated Sunflowers in Northwest Kansas: Productivity and Canopy Formation
Highlights
Sunflower is a crop of interest in the Ogallala Aquifer region because of its shorter growing season and lower overall irrigation needs
Dormant preseason irrigation increased achene yield and oil yield by 2% with most of this increase occurring in the extreme drought year, 2012
Sunflower was grown under sprinkler irrigation in Colby, KS, for three very different crop years (2009, cool and wet year; 2010, near normal overall but very dry after flowering; and 2012, severe drought year with high temperatures)
Summary
Sunflower was grown in a three-year study (2009, 2010, and 2012) at the Kansas State University Northwest Research-Extension Center at Colby, KS, under a lateral move sprinkler irrigation system. Irrigation capacities were limited to no more than 1 inch every 4, 8, or 12 days but were scheduled only as needed as determined with a weatherbased water budget. Achene (sunflower seed) yields and oil yield generally plateaued at the medium irrigation level. Dormant preseason irrigation increased achene yield and oil yield by 2% with most of this increase occurring in the extreme drought year, 2012. The optimum harvest plant population for sunflower in this study in terms of achene yield and oil yield was approximately 19,000 to 20,000 plants/a
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