Treesearch

Cuttings of cottonwood, willow, and sycamore were collectd monthly through the year and set in nursery beds. Every species yield an appreciable percentage of rooted cuttings every month. The best month was March; the worst month was June. Willow rooted more cuttings than cottonwood or sycamore, and those which rooted grew faster. Cottonwood grew faster than sycamore. Butt-cuts yielded more rooted cuttings than second-cuts, and those which rooted grew faster. Shoots on cutting with larger top diameters appeared for buttcuts of willow was the correlation statistically significant.

Height growth of Honduras pine (P. caribaea. v. hondurensis) seedllng'S 18 shown to be significantly influenced by photoperiod. Maximum initial effect was obtained by the longest period tested, 16 hours; but by 7 weeks, greatest growth was obtained by an interrupted 11 (8+3) hours.

Subsurface irrigation with nutrient solution was found to be biologically feasible under the conditions tested. Growth of seedlings was satisfactory, but not unusually good. On the bases of total height growth, and growth in fresh weight, the various fertilizers tested produced statistically different results. The species tested, members of three different families and native to three different continents, reacted similarly to the nutrient solutions tested. The highest root-to-shoot ratio obtained was in plain tap water.

Initial field testing for forest tree improvement is essentially a comparison of genetic groups whether the level of comparison is of species, provenances, or individual trees. A good study design should be as economical as possible, for a given precision, and must be accurate. The latter is simply obtained by restricting the study to a specified set of conditions, replicating adequately within those conditions, and randomizing the groups being compared. Precision is improved by minimizing variation within a sampling unit, by keeping careful, accurate records, and by additional replications...

Fire has come to be widely used as a tool in wildland management, particularly in the South. Its usefulness in fire hazard reduction, removal of undesirable trees, and changing of cover types has been demonstrated. We are continually trying to improve fire use, however, by learning more of the specific effects of fire on different species of plants.

The purpose of this bibliography is to list important publications relating directly to southern ranges, the domestic livestock and wildlife produced thereon, and the management of these lands, livestock, and wildlife. Range is defined as natural grassland, savannah, or forest that supports native grasses, forbs, or shrubs suitable as forage for livestock and game. Land under cultivation or in improved pasture is excluded.

Loblolly pine is widely planted for soil stabilization and the rehabilitation of denuded, actively eroding uplands of the upper Gulf Coastal Plain in north Mississippi and west Tennessee. This paper presents methods and specifications that recent research has developed for such planting. It supplements information found in Wakeley’s Planting the Southern Pines and Wahlenberg’s Loblolly pine with information specifically applicable on sites where erosion control is a primary objective.

A large nest of Atta texana (Buckley) in central Louisiana was partially excavated in August 1960. Twelve dormancy, 5 detritus, and 93 fungus-garden cavities were found. Fungus-garden cavities near the surface outnumbered those at lower depths and contained most of the fungus material and brood. Inquilines were most numerous in detritus cavities. Dormancy cavities are described as new to science. They resemble fungus-garden cavities, but differ in that the cavity is irregular in shape, the substrate is tightly packed and has a silage-like odor, and workers and inquilines in them are torpid.

Production and dispersal of longleaf pine (Pinus palustris Mill.) seeds were sampled in 1955, 1957, and 1958 on the Escambia Experimental Forest in southwest Alabama. Two transects of seed traps were established at right angles to each of four forest walls enclosing a rectangular 80-acre clearing. Walls were oriented in the cardinal directions, and consisted of second-growth longleaf pines 40 to 50 years old. Dominant trees averaged 65 feet in height.