1. Tob. Sci., 1979, 23-15, p. 47-48, ISSN. 0082-4523

    Sucker-producing characteristics of certain flue-cured tobacco varieties

    GWYNN G.R.
    Oxford Tobacco Research Laboratory, Agricultural Research, Science and Education Administration, U.S. Department of Agriculture, Oxford, North Carolina USA; Crop Science Department, North Carolina State University, Raleigh, North Carolina USA
    Number and weight of leaf axil suckers per plant of 15 varieties and one breeding line were studied in plantings at two locations and over 2 years. The range of performance and consistency across environments were measured in an effort to...
  2. Tob. Sci., 1979, 23-41, p. 139-142, ISSN. 0082-4523

    Production management of pale-yellow tobaccos and comparison to conventionally grown green tobaccos

    HAYES A.G.; GWYNN G.R.; WEEKS W.W.
    Department of Crop Science, North Carolina State University, Raleigh, North Carolina USA; Oxford Tobacco Research Laboratory, Agricultural Research, Science and Education Administration, U.S. Department of Agriculture, Oxford, North Carolina USA
    Three pale yellow tobacco (Nicotiana tabacum L.) breeding lines were evaluated agronomically and chemically under management schemes involving a topping height of 16 leaves per plant, a one or two harvest system, and variable nitrogen fertilization...
  3. Tob. Sci., 1978, 22-20, p. 71-72, ISSN. 0082-4523

    Long-term storage of tobacco pollen

    GWYNN G.R.
    Oxford Tobacco Research Laboratory, Science and Education Administration, United States Department of Agriculture, Oxford, North Carolina USA; Crop Science Department, North Carolina State University, Raleigh, North Carolina USA
    Tobacco pollen was stored for 90 months in four ways. Two storage methods involved use of a desiccant (silica gel) and different storage temperatures and one involved freeze-drying and sealing the pollen in a glass ampoule. In the fourth method...
  4. Tob. Sci., 1976, 20-23, p. 77-79, ISSN.0082-4523

    Chlorophyll, agronomic and chemical characteristics of yellow tobaccos

    GWYNN G.R.; HAYES A.G.
    Oxford Tobacco Research Laboratory, Southern Region, Agricultural Research Service, U. S. Department of Agriculture, Oxford, North Carolina USA; Crop Science, North Carolina State University, Raleigh, North Carolina USA
    A collection of 30 varieties of tobacco (Nicotiana tabacum) with growth characteristics similar to pale yellow Tobacco Introduction 1372 was studied for chlorophyll content, ripening characteristics, and agronomic and chemical properties. The yellow...
  5. Tob. Sci., 1976, 20-36, p. 120-124, ISSN.0082-4523

    Influence of management systems, cultivars, and planting dates on flue-cured tobacco production. I: Agronomic characters

    GOODEN D.T., III; WOLTZ W.G.; LONG R.C.; GWYNN G.R.; RAWLINGS J.O.
    Crop Science, Extension Agronomy Department, University of Georgia, Statesboro, Georgia USA; Crop Science, Soil Science, Oxford Tobacco Research Laboratory, Southern Region, Agricultural Research Service, U.S. Department of Agriculture, Oxford, North Carolina USA; Crop Science, Statistics, North Carolina State University, Raleigh, North Carolina USA
    Management systems for flue-cured tobacco (Nicotiana tabacum L.) involving variations in topping height, number of harvests, planting date, and cultivars with different ripening patterns were compared with a conventional system of topping and...
  6. Tob. Sci., 1976, 20-37, p. 125-128, ISSN.0082-4523

    Influence of management systems, cultivars, and planting dates on flue-cured tobacco production. II: Chemical characters

    GOODEN D.T., III; LONG R.C.; WOLTZ W.G.; GWYNN G.R.; RAWLINGS J.O.
    Crop Science, Extension Agronomy Department, University of Georgia, Statesboro, Georgia USA; Crop Science, Soil Science, Oxford Tobacco Research Laboratory, Southern Region, Agricultural Research Service, U.S. Department of Agriculture, Oxford, North Carolina USA; Crop Science, Statistics, North Carolina State University, Raleigh, North Carolina USA
    The effects of different management systems on quality of flue-cured tobacco (Nicotiana tabacum L.) were determined. Systems employed consisted of conventional topping height of 18 leaves harvested six (18/6) or three (18/3) times and two systems in...
  7. Tob. Sci., 1976, 20-57, p. 184-185, ISSN.0082-4523

    Cherry red variegation in flue-cured tobacco

    BURK L.G.; GWYNN G.R.
    Tobacco Research Laboratory, Southern Region, ARS, USDA, Oxford, North Carolina USA; Genetics and Crop Science, North Carolina State University, Raleigh, North Carolina USA
    Spontaneous genetic changes for alkaloid conversion (nicotine-nornicotine) were indicated by the occurrence of variegated leaves consisting of cherry red (CR) and cherry red-free (CRF) areas on individual leaves of flue-cured tobacco. Chromatographic...
  8. Tob. Sci., 1974, 18-01, p. 1-3, ISSN.0082-4523

    Differences among tobacco varieties and breeding material in chlorophyll content during content during curing

    GWYNN G.R.; McCLURE W.F.
    Oxford Tobacco Research Laboratory, Southern Region, Agricultural Research Service, U. S. Department of Agriculture, Oxford, North Carolina USA; North Carolina State University, Raleigh, North Carolina USA
    A nondestructive electronic method for measuring chlorophyll by dual wavelengths during the yellowing phase of tobacco curing was used in several experiments. The general objectives were to apply this method to several varieties-to characterize...
  9. Tob. Sci., 1974, 18-09, p. 23-25, ISSN.0082-4523

    Modified systems of production and harvesting of flue-cured tobacco

    GWYNN G.R.
    Oxford Tobacco Research Laboratory, Southern Region, Agricultural Research Service, U. S. Department of Agriculture, Oxford, North Carolina USA; North Carolina State University, Raleigh, North Carolina USA
    Two studies were conducted to measure the effect of reduced number of harvestings on different cultivars. In one study the tobacco was harvested in one, two, and three harvests with leaf population varying according to number of harvests. In the...
  10. Tob. Sci., 1973, 17-37, p. 108-109, ISSN.0082-4523

    Effect of maturity on germination of seed of six tobacco cultivars

    GWYNN G.R.
    Oxford Tobacco Research Laboratory, Southern Region, Agricultural Research Service, United States Department of Agriculture, Oxford, North Carolina USA; North Carolina State University, North Carolina USA
    This study was undertaken to determine the effect of early seed harvest on the viability of tobacco (Nicotiana tabacum L) seeds. Seeds of six tobacco cultivars were harvested 14, 18, 22, 26, and 30 (1968 only) days after anthesis. Seeds harvested 14...