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CORESTA Congress, Quebec, 2014, Agronomy/Phytopathology Groups, AP 27

Evaluation of nitrogen application timings on yield, quality, and sucker control in flue-cured tobacco

FISHER L.(1); DRAKE M.(2); VANN M.C.(1)
(1) North Carolina State University, Raleigh, NC, U.S.A.; (2) Universal Leaf NA, Nashville, NC, U.S.A.

Research was conducted in 2012 and 2013 to evaluate the effects of late season nitrogen application timing and method on yield, quality, and leaf nitrogen content. The total recommended nitrogen rate was split over up to four applications during approximately the first eight weeks of the growing season. The latest application was made at topping. Late season nitrogen applications were either applied as a “stalk rundown” or applied directly to the soil surface. Yield, quality, and leaf nitrogen content data were collected. Late season nitrogen applications did not result in adverse effects on yield or quality. Soil applied nitrogen applications late in the season increased yield compared to “stalk rundown” applications. Late season nitrogen applications increased leaf nitrogen content in both the cured leaf and green tissue samples collected one week after application. Both the 2012 and 2013 growing seasons had excessive rainfall, in some cases more than twice the normal rainfall amount for the season. With normal rainfall, it is likely the nitrogen applications at topping would result in adverse effects on leaf quality.