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This article in SSSAJ

  1. Vol. 51 No. 6, p. 1536-1540
     
    Received: Jan 26, 1987
    Published: Nov, 1987


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doi:10.2136/sssaj1987.03615995005100060024x

Nitrogen and Potassium Fertilization Effects on Yield and Quality of Burley Tobacco1

  1. G. K. Evanylo and
  2. J. L. Sims2

Abstract

Abstract

Field studies were conducted in 1983 and 1984 at Lexington, KY to examine the effects of N and K fertilizer on yield and chemical quality of burley tobacco (Nicotiana tabacum L. cv. Ky 14). Treatments included: NH4NO3 at rates of 112, 280, and 448 kg N ha−1; and two sources (K2SO4 and KCl), each at rates of 0, 112, 224, and 448 kg K ha−1. The following agronomic and chemical characteristics were examined: yield, price, leaf N, P, K, Ca, Mg, Cl, Mo, total alkaloid, and solanesol concentrations. Cured leaf yield, price, and solanesol concentration were strongly influenced by N × K interactions. Each was raised by increasing N rates when no K was applied; however, at higher K levels, increasing N rates resulted in smaller price increases, no yield changes, and reductions in solanesol concentrations. Reductions in cured leaf Mo concentration relative to N, K, and Mg levels with increasing K fertilization beyond 0 kg ha−1 were exaggerated as N rates were raised. No effect of N rates on total alkaloids or solanesol concentrations were noted while increased K rates increased concentrations of both. Greater cured leaf yields and Mo concentrations were achieved with KCl than with K2SO4. The positive effect of KCl on Mo concentration at low N application rates was reduced by increased N fertilization suggesting that Mo uptake was enhanced by Cl- but reversed at high levels of NO-3 application.

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