Treesearch

Glyphosate at 1.5 to 2.0 lbs. Per acre active ingredient will control aspen suckers, shrubs, and herbs when applied during August to early September. There appears to be some intersite variability in the efficacy of the herbicide.

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.

Techniques have been developed to evaluate end generate wood drying curves with hand-held computers (3-5K memory). Predictions of time to dry to a specific moisture content, drying rates, and other characteristics of wood drying curves can be made. The paper describes the development of programs and illustrates their use.

Uses a computer model to identify commercial forest that would benefit from forest management and the volume of removals that would result. Targets 63% of the state's commercial area for treatment--primarily harvest, stand conversions, and thinning.

Presents trends in private forest land ownership in Michigan's Upper Peninsula. Describes how changes in owners, their intentions, and their actions might affect the area's timber supply with implications for the national timber supply.

Describes a simple procedure for adjusting growth in the STEMS regional tree growth model to compensate for subregional differences. Coefficients are reported to adjust Lake States STEMS to the forests of Northern and Central Wisconsin--an area of essentially uniform climate and similar broad physiographic features. Errors are presented for various combinations of stand and tree variables.

Green weight of wood and bark can be greatly affected by moisture content. Average moisture content percentages and green weight conversion factors are presented for 42 tree species groups. Equations are also presented to compute average green weight of tops and limbs as well as stumps.

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 in the model.

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 attempted, and studies just beginning.