Theses and Dissertations

Issuing Body

Mississippi State University


Street, Jason T.

Committee Member

Shmulsky, Rubin

Committee Member

Seale, R. Daniel

Date of Degree


Document Type

Graduate Thesis - Open Access


Sustainable Bioproducts

Degree Name

Master of Science (M.S.)


College of Forest Resources


Department of Sustainable Bioproducts


This research investigates the effect that knots in close proximity have on strength properties of southern pine lumber. The project involved specimens of 2×4 dimension southern yellow pine lumber exhibiting multiple knots in close proximity. Knot dimensions were measured to determine the knot diameter (KD) parallel to the cross-section of the specimen, knot area (KA), and clear wood (CW). In addition, the density (D) using the entire specimen weight by volume was determined. A third-point bending test was used in a flatwise orientation to quantify the modulus of rupture (MOR) and modulus of elasticity (MOE). The relationships between the simple correlation coefficients showed significant correlation. Multiple regression analysis with one dependent variable, MOR, and three independent variables, KD, MOE, and D resulted in a coefficient of determination value (r2) of 0.702 as contrasted with 0.564 obtained by using MOE alone to predict MOR.