Treesearch

The response of six tree species and three Populus hybrids to irrigation with oxidation pond effluent were compared. When weeds were intensively controlled, a P. deltoides x P. nigra cross responded best, but when weeds were less intensively controlled, P. canescens x P. tremuloides responded best.

Soil properties were related to infiltration rates as measured by single-ringsteady-head infiltometers. The properties showing strong simple correlations were identified. Regression models were developed to estimate infiltration rate from several soil properties. The best model gave fair agreement to measured rates at another location.

Three methods of measuring height growth in field plantings are compared.

Populus had good survival and growth when planting sites had been treated with linuron, a pre-emergent herbicide, alone or in combination with paraquat, a post-emergent herbicide. the herbicide treatments that are most effective in intensive culture are discussed.

Describes the extent of forest land resources in Illinois and estimates their availability for timber and recreational uses using both conventional definitions of forest land and the broader concept of forest and associated land.

The pine needle rust of jack pine on the Little Sioux Burn in northeastern Minnesota infected large-leaf aster but not goldenrod. The rust was most severe when asters were abundant on the plots. Les than 10 percent of the jack pine were infected over a 3-year period when asters were more than 10 feet (3.05 m) from the mil-acre plots

Belt loading increases up to a point and then decreases as stock removal rate increases for red oak and yellow-poplar

Aspen suckers from 1-m-long root cuttings survived and grew better than those from 12.5-cm-long cuttings. Sucker survival and growth were also inversely related to parent root diameter. Discusses the practical implications for aspen management.

Southern pine and Douglas-fir boards, containing both heart- and sapwood and 1.75 inches thick, were jet dried at temperatures from 160 to 400 F and air velocities from 3,000 to 9,000 fmp. Jet drying was more effective for southern pine than for Douglas-fir.

This 32nd annual report shows 1977 pulpwood production by county and species group in Michigan, Minnesota, and Wisconsin. Production in these three Lake States inched ahead to 4.74 million cords from 4.69 million cords in 1976