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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:: THESIS OF ROBERT BRUCE TURNER for the DOCTOR OF PHILOSOPHY (Name) (Degree) in RANGE MANAGEMENT

The effects of plant population and nitrogen on sweet corn yields

Creator:: Moss, Joe Dick
Abstract:: The response of sweet corn (Zea mays L. var. rugosa cultivar Jubilee) to 12 populations and four nitrogen rates was studied in a field experiment. Populations ranged from 43, 904 to 329,800 plants/ha with nitrogen levels ranging from 0 to 224 Kg/ha. A systematic spacing design was used. Plant height,...
Resource Type:: Masters Thesis
Full Text:: . Recognition is also given to Dr. Michael H. Chaplin, Dr. William W. Chilcote, and Dr. Murray D

Factors influencing the herbicidal activity of dimethyl 2,3,5,6-tetrachloroterephthalate

Creator:: McKinley, James Raleigh
Abstract:: Studies were conducted to determine the site of DCPA toxicity on annual ryegrass. This was done by means of a technique which used pyrex tubing and a vapor barrier to separate exposure of coleoptile and roots of emerging grass seedlings to various concentrations of DCPA. Coleoptiles that emerged through treated...
Resource Type:: Masters Thesis
Full Text:: committee. Mr. D. E. Stallard and Dr. L. Gordon Utter of the Diamond Alkali Company for their cooperation

Compatibility of sheep and deer grazing with lodgepole pine regeneration in the pumice region of central Oregon

Creator:: Rudeen, David Paul
Resource Type:: Masters Thesis
Full Text:: Rudeen for the degree of Master of Science in Range Management presented on ut, J Title: COMPATIBILITY

Influence of weed density on efficacy of two soil-applied herbicides

Creator:: Burrill, L. C.
Abstract:: Several studies were conducted to determine the effect of weed density on herbicide efficacy. Diuron [3-(3, 4- dichlorophenyl) -1, 1- dimethylurea] was tested on various densities of Italian ryegrass (Lolium multiflorum Lam. ) under greenhouse and field conditions. Cycloate (S-ethyl N-ethylthiocyclohexanecarbamate) was tested on green foxtail (Setaria viridis (L. )...
Resource Type:: Masters Thesis
Full Text:: , soil, and climate. There is a wide range of possibilities for each of these. Another variable which

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:: of student) Ph. D. (Degree) in Soils presented on July 31, 1969 (Major) ) (Date) Title: GENETIC

Aspects of the autecology of the plethodontid salamander, Aneides ferreus (Cope)

Creator:: McKenzie, Donald Samuel
Abstract:: Laboratory experiments and simulated field conditions were utilized to gain a better understanding of the ecology of the clouded salamander. Animals collected in western Oregon were utilized for studies in habitat selection, where it was shown that there was a significant pattern of selection of litter types (rock, bark, and...
Resource Type:: Dissertation
Full Text:: approaches, as illustrated by the works of Bogart (1952), Deevey (1947), Hairston (1951), Noble (1930), Pope

Ecological relationships among feral horses, cattle, and pronghorn in southeastern Oregon

Creator:: McInnis, Michael Lindsay
Resource Type:: Dissertation
Full Text:: APPROVED: Professor of Rangeland Resources in charge of major sourcesHead of Department of Range Dean of

The influence of magnesium on the toxicity of atrazine

Creator:: Brenchley, Ronald Glenn
Abstract:: Atrazine is an asymmetrical s-triazine herbicide used pre- and post emergence for weed control in many crops. Triazine herbicides have been used in the Pacific-Northwest for weed control in orchard crops. Under certain conditions where trees were grown in nutrient deficient areas, it was noted that toxic symptoms due to...
Resource Type:: Masters Thesis
Full Text:: phytohormonal effects which are typical of 2,4 -D and MCPA herbi- cides. Gast (19) showed that 2- chloro- 4,6

John Wesley Powell : science and reform in a positive context

Creator:: Zernel, John Joseph, 1945-
Abstract:: John Wesley Powell worked actively for public land system reform while a director of geographical and geological surveys in the West from 1869 to 1894. Although this has won him acclaim as a conservationist, the basis of Powell's linkage of reform with scientific work is poorly understood. A study of...
Resource Type:: Dissertation
Full Text:: farther in the background Charles D. Walcott, head of the Geological Survey after Powell. 2 The

ScholarsArchive@OSU

Vegetation changes of communities containing medusahead (Taeniatherum asperum (Sim.) Nevski) following herbicide, grazing, and mowing treatments

The effects of plant population and nitrogen on sweet corn yields

Factors influencing the herbicidal activity of dimethyl 2,3,5,6-tetrachloroterephthalate

Compatibility of sheep and deer grazing with lodgepole pine regeneration in the pumice region of central Oregon

Influence of weed density on efficacy of two soil-applied herbicides

Genetic and stability relationships of four Western Cascade soils

Aspects of the autecology of the plethodontid salamander, Aneides ferreus (Cope)

Ecological relationships among feral horses, cattle, and pronghorn in southeastern Oregon

The influence of magnesium on the toxicity of atrazine

John Wesley Powell : science and reform in a positive context

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