Tobacco Science, 1992, 36, p. 30-5., ISSN.0082-4623
Mechanical properties of flue-cured tobacco lamina as related to maturity and stalk position descriptors of market grade 
University of Georgia, Dept. of Biology and Agricultural Engineering, Athens, GA, USA.
Market grades were determined on a leaf-by-leaf basis for flue-cured tobacco harvested in 1986 and 1987. The leaves were placed into categories that described stalk position and maturity as defined by the USDA's elements of quality. Uniaxial quasi ...