United States Department of Agriculture
Describes and illustrates a technique to mail and store diseased leaf samples to prevent deterioration or damaage.
A 6-year exposure test of three styles of siding made from nine hardwoods and given three treatments showed that full-length yellow-poplar vertical tongue-and-groove siding dip-treated in a water-repellent preservative performed best.
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...
In a plantation of four hardwood species on a silt loam soil planted to 1-0 stock, 4 pounds of active atrazine or simazine controlled weeds effectively without injuring the trees. Chemical weed control was better on plowed and disked ground than on unprepared ground. Yellow-poplar and white ash grew faster on prepared ground. Black walnut and red oak did not respond...
Gives the average rates of perimeter increase for fires in four broad fuel type groups by four spread index classes.
Presents 1966 forest type areas by counties and shows trends in forest type areas since 1955, by survey units.
Shows lumber production by species in three Survey Districts of northern Minnesota and by country for softwoods, aspen, and other hardwoods. Compares lumber production in 1960 with 1965
Springflow and ground water levels both rose with winter thaws, even when the ground was frozen. A high soil water content suggests that water moved to the water table through a continuous column of soil water rather than as a wetting front
A pilot study in three northern Minnesota spruce-fir stands showed that as cutting intensity increased, defoliation by the spruce budworm decreased. Commercial clear cutting reduced defoliation most.
Culverts too small in diameter or poorly placed were major causes of timber flooding and tree damage. Placement problems were poor culvert slope, poor hydraulic approach, lack of gravel bedding, and too little soil covering the culverts.
ABSTRACT. -- A computer program written in FORTRAN has been designed to summarize data. Class frequencies, means, and standard deviations are printed for as many as 100 independent variables. Cross-classifications of an observed dependent variable and of a dependent variable predicted by a multiple regression equation can also be generated.
In 1966, Michigan had 19.4 million acres of forest land. Almost half of the 18.9 million acres classified as commercial forest land was in Upper Michigan. Since 1955 commercial forest land has increased from 2.4 million to 2.8 million acres in Southern Lower Michigan, and decreased from 7.7 million to 7.0 million acres in Northern Lower Michigan.
Tests of streambank erosion control measures on three Michigan streams have shown the key role of waterline stabilization. After undercutting was stopped, the upper banks were revegetated in 1 to 5 years depending on treatment. Without waterline control, all revegetation efforts were ineffective.
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.
Prescribed burning to prepare a seed-bed, seedling native grasses or fescue on proper sites, and fertilizing are all necessary for successfully establishing good grass production where trees have been killed by aerially applied berbicides.
Most of the intensive grazing on forested land in the Missouri Ozarks is occuring on land with a low potential for growing commercial timber.