Treesearch

Another record high was established in pulpwood production by southern states during 1955. The total harvest amounted to 18,014,600 cords, an increase of 1,745,000 cords, or 10.7 percent, over production in 1954. The sharp upward trend of production in the South is especially apparent when compared with earlier years. The 1955 cut was about double the amount cut in 1947 and three times as great as the total production in 1940. Current activity in construction of new mills, together with installation of additional capacity in operating mills, can be expected to create new production records...

Foresters concerned with estimates of timber volume growth on any area or tract must first of all determine the rate of increase in tree size. The most important measurement, and often the only one made, is of the change in tree diameter at breast height over a specified period of years. Increment cores taken at this point 4.5 feet above ground are commonly used to measure the combined radial growth of a number of annual rings. This method provides data on the rate of wood growth, but it is impractical for measuring changes in bark, which slowly increases in thickness over the years.

During drouth, black willow (Salix nigra Karsh.) is quite sensitive to subsoil differences. Surface inspection alone rarely gives an adequate clue to the quality of the variously stratified alluvial soils on which willow may occur.

As management is intensified in bottomland forests, efforts will be made to control species composition. One criterion for the selection of species to favor is growth rate, about which relatively little is known for bottomland species. This study was made to compare the relative growth rates of certain bottomland hardwood species in southern Louisiana.

Report of study of the peripheral-milling process of planing lumber. Relationships were determined between cutterhead horsepower and various combinations of specimen, cutterhead, and feed factors. Power demand curves are interpreted by comparion with simultaneous one micro-second photos of chips. Secondary consideration is given to quality of surface obtained. The cutterhead variables, feeds, and speeds are in range of theose commonly used in industry.