Treesearch

Sixteen years (1959-1974) of bald eagle nesting data representing 102 nests were examined. Nest survey intensity increased in the late 1960''s and was most comprehensive during 1972, 1973, and 1974. Some nests were used for at least 15 years. Most nest trees were white pines, reflecting availability. IN 1974 the number of active and successful nests and young produced were relatively low.

As a part of the 1974 Forest Survey of Iowa, the Station''s Forst Resources Evaluatioin Research Staff developed a merchantable tree volume equation and tables of coefficients for Iowa. They were developed for both board-foot (International ?-inch rule) and cubic foot volumes, for several species and species groups of growing-stock trees. The equation and the coefficients can be used on a digital computer or modern electronic desk calculator by industrial foresters, consulting foresters, or others in need of quick net-volume-per-tree estimates.

Recently published site index prediction tables for oak in Missouri were fomulized using the "matchacurve" system. The average absolute differences between formula and table values were .8 feet for white oak and 1.4 feet for black and scarlet oaks; maximum differences were 3.0 and 4.2 feet, respectively.

Weeds must be controlled for at least 3 years to successfully establish walnut plantations. Whether by cultivating or applying chemicals, a strip or spot 4 feet wide is sufficient the first 2 years, followed by a 6-foot spot or strip for the third and fourth years.

Large growth differences were found for hardwoods in shelterbelts on three contrasting soils of western Minnesota. Fiver years after planting, height growth was outstanding for green ash and Russian olive planted on a moderately fine-textured, somewhat poorly drained soil. Growth was much poorer on coarse-textured or shallow soils. Size of planting stock was not related to growth of trees after planting.

Snowmelt overland flow was measured for one season from 10-year-old plantations of red pine, Norway spruce, European larch, and from old field control plots, on both north and south slopes. Pine and spruce plots produced more runoff than larch and old field plots; and south slope plots produced more runoff than north slope plots.

Shows 1973 saw log production by county of origin for 24 species groups. Discusses production changes since 1967, the last year of detailed data, in major species and reasons for the change.

Sweage affluent applied to jack pine in southwestern Wisconsin significantly increased diameter growth during the second year.

Plywood house siding made to simulate reverse board-and-batten design is sometimes attacked by woodpeckers because leaf-cutting bees, their prey, make nests in holes in the plywood core. The problem can be prevented by plugging the holes before nesting occurs. If nesting does occur, the nest should be destroyed and then the holes plugged.

A red pine conversion planting was established on a cutover northern hardwood site in 1929. Competing hardwoods were conrolled on half the area by cleaning during the first 10 years after planting. After 46 growing seasons pine survival was 70 percent on the cleaned plot, and 25 percent on that not cleaned; mean annual increment was 2.37 cords(190 ft3), and .91 cords (73 ft3) per acre respectively. Merchantable volume of pine was 109 and 42 cords per acre. These data demonstrate the inability of red pine to compete with maple on medium textured soils, and illustrate the growth potential of...