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CORESTA Meeting, Agronomy/Phytopathology, Louisville, 1991

Response of Burley tobacco to in-row fertilizer placement

SIMS S.
University of Kentucky, Dept. of Agronomy, Lexington, KY, USA
A replicated field experiment was conducted at Lexington, Kentucky, on Maury silt loam soil (Typic Paleudalf) using Burley tobacco (Nicotiana tabacum L. cv. KY 14). The purpose of the study was to determine the response of Burley to placement (banding) N-P-K fertilizer in or near the row. The experimental soil used tested low in K. Treatments consisted of various application rates of grade 6-24-32(N-P2O5-K2O) fertilizer applied either broadcast, in 40 cm wide bands directly under and parallel to the row, in 8 cm wide bands applied 50 cm apart and perpendicular to rows, or in 2 drill bands each 10 cm to the side of the row. Nitrogen fertilizer(NH4NO3) was applied uniform to all plots at the rate of 265 kg Nha-1. Results indicated that plant response increased as rate of 6-24-32 fertilizer increased and response was greater in all band treatments than the broadcast control. As contrasted to broadcast applications, in-row placement of fertilizer in 40 cm wide bands resulted in greatest increases in plant K, plant dry weight, and cured leaf yield and value. (Nitrogen. Potassium. Phosphorus )