Treesearch

New Brunswick is presently planting 20,000 ac. per year and expects to be planting nearly 60,000 ac. per year by 1979. Total productive forest area is 15,000,000 acres. The program is directly related to projected industrial demand and other forest uses. Plantations are established by scarification and planting of paper pot containers and bare root stock.

Successful hardwood afforestation is possible provided the following conditions can be met: (1) a deep, moist but well-drained soil; (2) intensive site preparation, preferably plowing and disking of the total plantation area; (3) careful planting of healthy, sturdy planting stock; (4) effective weed control for at least the first two and preferably three years after planting; and (5) control of rabbits and mice.

The design of a rough mill for the production of interior furniture parts is used to illustrate a simulation technique for analyzing and evaluating established and proposed sequential production systems. Distributions representing the real-world random characteristics of lumber, equipment feed speeds and delay times are programmed into the simulation. An example is given of how bottlenecks are found and removed in order to design on paper a layout that will meet a set of goals before a single piece of equipment has been purchased. GPSS (a General Purpose Simulation System language) was used.

Variations of monoterpenes in cortical oleoresins and foliar samples were determined for seed from 16 provenances of eastern white pine (Pinus strobus L.). The experiment was analyzed using the "raw" and the arcsine "transformed" data. Alpha-pinene, camphene, and β-pinene varied between seed sources when "raw" data were analyzed and α-pinine, β-pinene, and myrcene varied between seed sources when "transformed" data were analyzed. No trend was detected for latitude or longitude of seed origin for any monoterpene. Foliar monoterpenes did not vary among seed sources and no geographic pattern...

Concepts and procedures for heritability estimations through the variance components and the unified F-statistics approach are described. The variance components approach is illustrated by five possible family selection schemes within a diallel mating test, while the unified F-statistics approach is demonstrated by a geographic variation study. In a balance design, the use of the heritability formula h2 = 1-(1/F) is recommended. The F value is the same computed F value used in the analysis of variance for testing quality of genetic units.

Irregular experiments may be more useful than much smaller regular experiments and can be analyzed statistically without undue expenditure of time. For a few missing plots, standard methods of calculating missing-plot values can be used. For more missing plots (up to 10 percent), seedlot means or randomly chosen plot means of the same seedlot can be substituted for missing plots, provided between-block differences are small. Whatever the number of missing plots (provided there is more than one plot per seedlot) or the size of the between-block differences, seedlot means and sums of squares...

Yellow x paper birch hybrids and yellow birches with common female parents were compared after 5 growing seasons in an open field. Survival of the hybrids was 91 percent compared with 64 percent for the yellow birch trees. The hybrids were from 25 to 32 percent taller than the yellow birches and had 19-40 percent greater diameter. Because this hybrid not only grows better than yellow birch but also withstands greater environmental stress, it appears suitable for planting on open or partially shaded sites where ecological conditions are less favorable for yellow birch.

Tissue culture methods are applied to poplars of the Aigeiros group in attempts to overcome premature decline thought to be associated with viral infections. Hybrid selections from such cultures outplanted in 1975 at the F. G. Wilson Nursery in Boscobel, Wisconsin subsequently were severely infested by the Cottonwood Leaf Beetle, Chrysomela scripta Fab. Beetle populations built up rapidly in spring 1977 and severe defoliation occurred; an average of 45% of the terminal buds were destroyed and 73 percent of the tips of a preferred clone were fed upon. Younger foliage appeared preferred and...

Growth and survival of 20 provenances of northern white-cedar in the nursery and to age 12 in 3 test plantings in east central Illinois were examined. Survival at age 12 exceeded 95 percent in all tests. Total height differed significantly among provenances at age 4 in the nursery and at greater ages in all tests except after the first and second growing seasons following extensive and severe foliage injury during the winter of 1970-71. Height rankings of provenances varied between test sites and with age on the same site. Provenances from isolated occurrences south of the main range of...

Twenty-one seed sources of Himalayan white pine (Pinus griffithii McClel.) (11 from native stands and 10 from planted trees) were studied in Maryland's State Forest Tree Nursery and in 11 plantations in Maine, Maryland, Michigan, Illinois and North Carolina. In the nursery, intraspecific variations were observed in leaf lengths, time of bud-set, tendency for secondary growth, and 2-year heights and diameters. Survival rates in Maryland's Piedmont Plateau and coastal plain, and in North Carolina were satisfactory, In Maine, New York, Michigan, Illinois and Maryland's Allegheny Mountains, P....