Treesearch

An attendance bonus paid by a wood processing firm was studied to determine its effectiveness in reducing absenteeism. Employees were divided into permanent and short-term groups, and their response to the bonus was studied, using non-parametric tests. The evidence suggested that the incentive favorably influenced the work attendance of only the permanent group. Recommendations are made for future research.

The third timber inventory of Missouri's Eastern Ozarks Forest Survey Unit shows that there was a substantial gain in the volume of growing stock and smaller but sizable gain in the volume of sawtimber between 1959 and 1972; however, the area of commercial forest land declined slightly. This report gives statistical highlights and tables presenting detailed information concerning forest area as well as timber volume, growth, mortality, ownership, and use.

Shows Indiana saw log production by species and state of destination in 1971, and saw log receipts in Indiana by species, state of origin, and survey unit. Comparisons with similar data in 1966 are made and reasons for changes in production and receipts are given. Lumber market conditions and sawmill size and locations are discussed. Gives the volume and wood and bark residue produced at Indiana sawmills in 1981 by type of use, by county, and by softwoods and hardwoods.

Shows 1972 veneer-log production and receipts by species in the Lake States (Michigan, Minnesota, and Wisconsin) and in the Central States (Illinois, Indiana, Iowa, and Missouri). Comparisons are made with similar data for 1970. Includes tables showing veneer-log production and receipts (for selected years) since 1946 in the Lake States and since 1956 in the Central States.

The third timber inventory of Missouri's Northwestern Ozarks Forest Survey Unit shows substantial gains in both growing-stock and sawtimber volumes between 1959 and 1972. The area of commercial forests declined during the same period. Presented are highlights and statistics on forest area and timer volume, growth, mortality, ownership and use in 1972.

Mandatory permits provide recreation managers with better use estimates. Because some visitors do not obtain permits, use estimates based on permit data need to be corrected. In the Boundary Waters Canoe Area, a method was devised for distinguishing noncomplying groups and finding correction factors that reflect the impact of these groups. Suggestions for improving compliance are also discussed. Overall compliance was 88% of the sample. Groups without permits were primarily daytime motorboat users. The method is applicable to other wilderness areas where permits are required.

In red pine or aspen stands only two soil samples were needed to estimate (+/- 10%, 95% confidence) pH, bulk density, or sand, but 25 to 60 samples were required to estimate N, P, K, Ca, Mg, available water, or silt + clay. To estimate most forest floor properties required 30 to 50 samples in red pine stands, but only about half as many in aspen stands.

Neither planting method nor stock treatment had any appreciable effect on survival and growth of black walnut, but survival and growth were significantly affected by the planting site and site preparation.

Site index prediction tables for black, scarlet, and white oaks for southeastern Missouri are presented based on site index/height regressions of data from 741 sectioned trees. Formulae for site index conversion between species and confidence intervals for mean stand site index estimates are also presented.

New site index curves for black oak are used to illustrate how contrasting tree height and diameter-growth patterns for good and poor sites are related to log quality.