Because the majority of sunflowers in the United States are grown in the Great Plains, recommendations for plant populations and fertilization rates are limited to this specific region and climate. Due to the temperate climate of the northeast, it is likely that optimal seeding rates and nitrogen (N) rates for sunflower production will differ from the Great Plains. A crop’s N requirements are often linked to population; this study attempts to evaluate the impact of both seeding rates and N rates on sunflower yield and quality.
Vermont, University of Vermont Extension
Darby, Heather; Harwood, Hannah; Cummings, Erica; Madden, Rosalie; Monahan, Susan; and Gervais, Amanda, "Sunflower Seeding Rate X Nitrogen Rate Trial" (2011). Northwest Crops & Soils Program. 40.