Treesearch

Improvement cuttings can speed growth and development of hardwood stands on rundown slack water sites in the Mississippi Delta. This statement summarizes 20-year results of a study begun on the Delta Experimental Forest in 1940. When the study started, the stand was typical of much of the second growth timber in the Delta. It consisted of an uneven-aged aggregation of mixed hardwoods that had been repeatedly logged for the best trees, cut over for fuelwood, and burned frequently since the original logging about 1913.

Numerous thrifty sprouts developed when pole-sized sweetgums in Mississippi were cut to low stumps. At age 6 years, dominant sprouts averaged 16 feet tall on clay sites in a stream bottom and 22 feet on a moist silt loam in the uplands.

Many diverse approaches have been made prescribing and evaluating thinnings on an objective basis. None of the techniques proposed hasbeen widely accepted. Indeed. none has been proven superior to the others nor even widely applicable. There are at least two possible reasons for this: none of the techniques suggested is of any general utility and/or experimental error (whether or not results are actually subjected to statistical analyses) is so large that real treatment effects are hidden..

There is an extensive literature dealing with techniques and gadgets to facilitate counting tree growth rings. A relatively simple method is described below, satisfactory for species too difficult to count in the field, but not sufficiently difficult to require the preparation of microscope slides nor staining techniques.

North Carolina was the Southeast's leading producer of veneer logs in 1963 with 140 million board feet--29 percent of the more than 484 million board-feet total. Georgia ranked second, with 129 million board feet, and was followed by Florida, South Carolina, and Virginia, respectively (table 1). This information was obtained from a canvass of veneer mills that drew wood from the Southeast in 1963. Veneerlog receipts were reported by state of origin. An undetermined volume of logs cut in the region and ex- ported outside the United States is not included.

Presents standards for locating, operating, and maintaining forest fire danger stations in Eastern and Southern States. Includes tables and forms for deriving the Spread Index of the new National Fire-Danger Rating System.

Wood users have long recognized and evaluated differences in timber quality of southern pine. However, the many concepts of quality were based largely on individual experience. This varied concept of timber quality and the absence of a general system or systems for measuring it existed until the 1930's.

Field spray tests were conducted from 1959 to 1961 in north Florida to evaluate the effectiveness of hydraulic spray applications of BHC, Guthion, and DDT for the control of coneworms, Dioryctria spp., and the slash pine seedworm, Laspeyresia anaranjada. Slash pines up to 40 feet in total height were protected from coneworm attack with BHC (4 lbs. gamma isomer/100 gal. water) or Guthion (1.5 lbs./lOO gal. water). DDT (4 lbs./100 gal. water) did not give satisfactory protection from coneworms. Of the three tested, Guthion was the only insecticide which controlled the seedworm. A spray...

Previous papers in this series of four have explored technical aspects of converting southern pine boltwood into long laminated beams of uniform high strength. This final discussion examines production and economic aspects of the proposed system.