CORESTA Congress, Online, 2022, Agronomy/Phytopathology Groups, AP 04

Developing nitrogen and potassium fertilizer recommendations for Connecticut broadleaf cigar wrapper tobacco in North Carolina

SHORT M.M.; VANN M.C.; CHEEK J.A.; MACHACEK J.L.; WHITLEY D.S.
North Carolina State University – Crop and Soil Sciences Department, Raleigh, NC, U.S.A.

Connecticut broadleaf cigar wrapper tobacco is a new crop to North Carolina. As such research-based fertilizer recommendations are needed to assist farmers with commercial production. Nitrogen (N) and potassium (K) rate trials were conducted in four environments across North Carolina in 2021. The research locations represented Coastal Plain, Piedmont, and Appalachian Mountain production areas of the state. Nitrogen application rates of 0, 90, 179, 269, 359, and 448 kg/ha were tested in each environment. In a separate but co-located trial, rates of 0, 56, 112, 168, 224, 280, and 336 kg K2O/ha were evaluated. Preliminary data showed that higher N and K2O rates produced higher N and K concentrations in the leaf tissue, respectively, especially later in the season (6 and 9 weeks after transplanting). Additionally, our limited results indicate that the optimal N rate for maximized leaf yield is roughly 199 kg/ha. The K2O rates we evaluated did not affect yield; however, this may be due to high initial K levels within those soil systems prior to transplanting (equivalent of 131 to 383 kg K2O/ha). Results from all environments will be presented.