United States Department of Agriculture
Describes and illustrates a technique to mail and store diseased leaf samples to prevent deterioration or damaage.
Documents the biomass in 12 typical stands of puckerbrush and evaluates the feasibility of several potential systems to harvest these stands. Identifies areas of needed development for economically viable harvesting systems.
The second forest resource inventory of Nebraska showed a 25% decline in commercial forest area and 23% gain in growing-stock volume between 1955 and 1983.
Compares effeects of various wee-control methods, including hericides, cultivation, and legume cover crop, on tree survival and height growth of 2-year-old hybrid poplars. Cultivation and herbicides singly or in combination gave consistently better results than the other treatment tested.
Describes the financial performance of red pine on site index 60, 70, and 80 lands by using new yield evidence and up-to-date cost and revenue assumptions. Best combinations of initial stocking, residual basal area after thinning, an rotation age are identified for two different financial criteria: soil expectation value and internal rate of return.
Herbicides of 17 different rates and formulations were oversprayed on newly planted 1-0 European larch seedlings in teh spring of 1983 at the recommended rates. Simazine, bifenox, oxyfluorfen, promamide, and oryzalin provided adequate weed control with no damage to the larch. Height growth at the end of the first growing season was one-and-a-half times greater in the...
Species coefficients are reported for predicting individual tree survival for nine Lake States species, supplementing a previous report for 10 species. Tree attributes are diameter growth rate and diameter at breast height. Regional and local performances are summarized.
In 1981 wooded strips and windbreaks in Kansas coverd 336,000 acres and were more than 54,000 miles long. Wooded strips contained 300 million board feet of sawtimber and 92 million cubic feet of growing stock.
Two study sites in central Missouri oak-hickory forests were searched for nest sites of cavity nesting birds. Researchers located and measured 133 nests of 11 species. Cavity nesting bird habitat selection is affected by both snag characteristics and vegetation structure.
Projected softwood shortages and high costs of mechanized tree planting indicate that more efficient planting equipment and systems are needed. This paper presents cost and productivity data for mechanically planting red pine seelings on a site previously occupied by hardwoods in northern Wisconsin
A model is described for estimating total and merchantable tree heights for Lake States tree species. It is intended to be used for compiling forest survey data and in conjunction with growth models for developing projections of tree product yield. Model coefficients are given for 25 species along with fit statistics. Supporting data sets are also described.
Hundred-seed weights from 15 trees in each stand averaged 330 mg; 100-seed weights differed significantly among trees within stands and among stands. Germination of filled seed averaged 95 percent; germination differed significantly among trees within stands, but not among stands. Detailed seed records should be kept for all seed orchards.
Research evaluation is a relatively recent endeavor in forestry economics. This workshop represents most of the current and recently completed studies available in this subfield of forestry and evaluation. Also included are discussions of scientists and policymakers concerning the uses of forestry research evaluations, evaluation problems encountered, solutions...
The third inventory of the timber resources of Kansas shows a 1.4% increase in commercial forest area and a 42% gain in growing-stock volume between 1965 and 1981. Highlights and statistics are presented on area, volume, growth, mortality, removals, utilization and biomass.
Summarizes a series of studies that investigated chemical weed control from time of planting to the end of the second growing season. The studies confirm the importance of weed control with preemergents at the time of planting and the importance of additional weed control before the start of the second growing season.
Plants are indicators of environmental factors like moisture, nutrients, heat, and light. Semi-quantitative indices for these four factors were developed for 90 Michigan trees and shrubs. The indices and a tally of species present provide a simple evaluation of the environment of a forest stand and a useful management aid.
Timber harvests on the Superior and Chippewa National Forests in Minnesota are projected to increase substantially by 2030. The increasing demand for aspen may affect the total harvests. Both forests need to give high priority to aspen management.
A BASIC language set of programs, designed for use on microcomputers, is presented. This set of programs will perform the analysis of variance for any statistical model describing either balanced or unbalanced designs. The program computes and displays the degrees of freedom, Type I sum of squares, and the mean square for the overall model, the error, and each factor...
Five site preparation treatments consisting of combinations of tillage, contact herbicide (glyphosate), and pre-emergent herbicide (linuron) were tested for their effects on tree survival and growth. Treatments had little effect on tree survival, but effects on second-year-tree height were significant and additive -- i.e., tree height increased as the number of types...
Between 9 and 12 years Larix eurolepis grew annually about 1.3 m in height and 0.6 cm in diameter. In plots with 0.8 to 1.5 m(2) of growing space, total woody biomass increased from 70.1 to 98.8 mt/ha, and the mean annual biomass increment from 7.8 to 8.2 mt/ha.