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Filtering by: Creator Frost, Kenneth Committee Member Chilcote, William W.

Responses of vegetation and sheep to three grazing pressures

Creator:

Thetford, Frank Oren

Abstract:

A study was conducted over a two year period, 1973 through 1974, on perennial ryegrass-subclover pastures with stocking rates of 7.4 (moderate), 9. 9 (heavy), and 12.4 (overstocked) ewes per hectare to establish guidelines on stocking intensity for dryland improved pastures in western Oregon. Climatic conditions varied annually and caused...

Resource Type:

Dissertation

Full Text:

which had been injured by frost, disease, insects, mechanical means, or grazing were more susceptible
Genetic and stability relationships of four Western Cascade soils

Creator:

Paeth, Robert Carl, 1925-

Abstract:

A sequence of soils derived from tuffaceous rocks was sampled on the H. J. Andrews Experimental Forest and adjacent U. S. Plywood land to determine some genetic and stability relationships. The less than two micron size fraction from each sample was characterized by x-ray diffraction with respect to crystalline clay...

Resource Type:

Dissertation

Full Text:

sample sites on the. H. J. Andrews Experimental Forest and to Rudolph B. Addison and Kenneth M. Hughes
Vegetation changes of communities containing medusahead (Taeniatherum asperum (Sim.) Nevski) following herbicide, grazing, and mowing treatments

Creator:

Turner, Robert Bruce

Abstract:

Studies were conducted from 1962 to 1966 to investigate the effectiveness of several practices in manipulating medusahead (Taeniatherum asperum (Sim. ) Nevski) infested and/or dominated ecosystems by releasing competition in favor of perennial grasses. Several herbicide treatments were evaluated for selective control of medusahead and cheatgrass (Bromus tectorum L. )...

Resource Type:

Dissertation

Full Text:

first killing frost in fall is about October 10 and the average last kil- ling frost in spring is about