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11 results

  1. Tob. Reporter, 1994, 121-1, p. 49-54. Tob. Sci, 1994, 38, p. 1-6, ISSN.0361-5693

    Quantification of tobacco specific nitrosamines in tobacco

    RISNER C.H.; WENDELBOE F.N.
    R.J. Reynolds Tobacco Company, R&D, Bowman Gray Technical Center, Winston-Salem, NC, USA
    An analytical procedure was developed for the extraction and quantification of tobacco specific nitrosamines (TSNA): N'-nitrosonornicotine (NNN), N'-nitrosoanatabine (NAT), N'-nitrosoanabasine (NAB), and 4-(methylnitrosamino)-1-(3-pyridyl) ...
  2. Tob. Reporter, 1994, 121-7, p. 53-5. Tob. Sci, 1994, 38, p. 55-7, ISSN.0361-5693

    Economic analysis of a one-person mechanized harvest system for Maryland tobacco

    HANSON J.C.; MCKEE C.G.
    University of Maryland, Dept. Agric. and Resources Econ., College Park, MD, USA
    The length of time was measured for one person to harvest and barn Maryland tobacco using a partially mechanized system where stalks were cut mechanically, plants were speared onto sticks, sticks were loaded onto beams in the field, and beams were hung in ...
  3. Tob. Reporter, 1994, 121-9, p. 84-7. Tob. Sci, 1994, 38, p. 68-71., ISSN.0361-5693

    The determination of scopoletin in mainstream tobacco smoke

    RISNER C.H.; PARSONS S.V.; WINKLER L.S.
    R.J. Reynolds Tobacco Company, Bowman Gray Technical Center, Winston-Salem, NC, USA
    A method was developed that determines the scopoletin content of mainstream cigarette smoke. A Cambridge pad containing the wet total particulate matter (WTPM) of five cigarettes was extracted with 1% acetic acid (HAc), and the extract was subjected to ...
  4. Tob. Reporter, 1993, 120-11, p. 37-45. Tob. Sci, 1993, 37, p. 69-77, ISSN.0361-5693

    Factors influencing the irrigation efficiency of flue-cured tobacco grown in north Queensland, Australia

    TONELLO P.E.; PREGNO L.M.; WEEDEN B.R.
    Dept. of Primary Industries, Mareeba, Queensland, Australia
    A three-year study was begun in 1988 using commercial size (10-15 ha) flue-cured tobacco (Nicotiana tabacum L.) plantings within the Mareeba-Dimbulah Irrigation Area (MDIA) of north Queensland, Australia. This study aimed to determine the water ...
  5. Tob. Reporter, 1993, 120-6, p. 48-51. Tob. Sci, 1993, 37, p. 30-3, ISSN.0361-5693

    Performance of anther-derived dihaploids in Maryland tobacco

    McCONNELL M.E.; AYCOCK M.K. Jr.
    University of Maryland, Dept. of Agronomy, College Park, MD, USA.
    The objectives of this study were to develop anther-derived dihaploid lines from two Maryland tobacco (Nicotiana tabacum L.) cultivars, MD 609 and MD 341, and to compare the performance of the dihaploids with their parental sources. Haploid production per ...
  6. Tob. Reporter, 1993, 120-9, 69-73. Tob. Sci, 1993, 37, p. 49-53, ISSN.0361-5693

    Collection and ion chromatographic determination of nitrous acid in air

    RISNER C.H.
    R.J. Reynolds Tobacco Company, Bowman Gray Technical Center, Winston-Salem, NC, USA
    An active sampling method based on a solid-phase collection medium was used to determine nitrous acid concentrations in indoor air. A carbonate-bicarbonate coated filter was found to be inefficient for collection of nitrous acid. An amino type, weak anion ...
  7. Tob. Reporter, 1991, 118-1. Tob. Sci, 1991, 35, p. 1-5, ISSN.0361-5693

    Genetics of hornworm resistance in Maryland tobacco

    WILHITE F.M.; AYCOCK M.K.; MENCHEY E.K.
    University of Maryland, Maryland Agric. Exper. Sta., Dept. of Agronomy, College Park, MD, USA
    During outbreak years, the two species complex of tobacco hornworms, Manduca sexta (L.) and tomato hornworms, M. quinquemaculata (Haworth), may cause considerable economic loss to Maryland tobacco, Nicotiana tabacum (L.). This study was designed to aid ...
  8. Tob. Sci., 1991, 35, p. 45-8., ISSN.0082-4623

    Comparison of extractants for estimating heavy metal availability in mid-Atlantic coastal plain soils

    MULCHI C.L.; ADAMU C.A.; BELL P.F.
    University of Maryland, Maryland Agricultural Experiment Station, Dept. of Agronomy, College Park, MD, USA
    The effectiveness of four soil extractants- diethylene triamine pentacetic acid (DTPA) at pH 7.3 and 5.3, Mehlich 1 (0.05 N HCl + 0.025 NH2SO4), and Mehlich 3- for estimating labile Zn, Cu, Mn, Pb, Ni, and Cd in Coastal Plain tobacco soils in Maryland was ...