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Nitrogen 15 studies with nonleguminous nitrogen-fixing plants

Creator:: Webster, Stephen Russell
Abstract:: Snowbrush (Ceanothus velutinus), red alder (Alnus rubra), and bitterbrush (Purshia tridentata) are three important nitrogen- fixing nonleguminous species. They commonly grow in association with commercially important conifers in western United States and conceivably could be utilized to add nitrogen to forest ecosystems. Nitrogen 15 gas was used to study nitrogen...
Resource Type:: Masters Thesis
Full Text:: with sincere thanks the interest and guidance offered by Dr. C. T. Youngberg whose efforts provided

Soil-site relationships in second growth Douglas-fir stands in the central Oregon coast range

Creator:: Urie, Dean Howard
Resource Type:: Masters Thesis
Full Text:: appreciation is due to Dr. C. T. Youngberg for is aid in introducing me to the 80118 of the Douglas- fir

Effect of thinning Douglas-fir on soil moisture, temperature and nitrogen relations

Creator:: André, Johnnie Edgar
Resource Type:: Masters Thesis
Full Text:: the soils department for their help and criticism. Special appreciation is due Dr. c. T. Youngberg

First year development of three conifers on surface and exposed subsoil horizons

Creator:: Cochran, Patrick Holmes, 1937-
Resource Type:: Masters Thesis
Full Text:: offered by Mr. W.I. Stein and Mr. W. H. Hallin, Roseburg Research Center Staff, were rnuch appreciated

Nutrient uptake by conifer seedlings as influenced by root CEC and competing species

Creator:: Schöne, Dieter Hans-Friedrich
Abstract:: The objectives of this study were to establish a suitable method for the measurement of the root cation-exchange capacity of conifer seedlings, and to examine possible influences of this root characteristic on nutrient absorption from a Bellpine soil under greenhouse conditions. The exchange sites of fresh, excised roots were saturated...
Resource Type:: Masters Thesis
Full Text:: wishes to express his appreciation to Dr. C. T. Youngberg who helped and advised on many occasions and

The role of certain non-leguminous woody species in the nitrogen nutrition of some conifer seedlings

Creator:: Wollum, Arthur George
Resource Type:: Masters Thesis
Full Text:: ACKNOWLEDGEMENTS I 1m especially grateful to my Major Professor, Dr . C. T. Youngberg, for stimulating my

Amount and chemical composition of understory vegetation in Alsea basin forest communities

Creator:: Tarnócai, Charles
Abstract:: The understory vegetation was sampled in eight plant communities of a Douglas-fir ecosystem to determine the organic matter production and mineral composition. Four sample sites were selected in each plant community and the understory vegetation sampled using the method of quadrats of successively increasing size. All herbaceous plants were separated...
Resource Type:: Masters Thesis
Full Text:: Tarno'cai r>/ (`'l - A C K N O W L E D G M E N T T he author is especially grateful to his

The relationship of the survival of Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco, seedlings to certain soil and other site characteristics on the Tillamook Burn

Creator:: Lowry, Gerald L., 1928-
Resource Type:: Masters Thesis
Full Text:: is extended to Dr. c. T • . Youngberg for his council and guidance . This study was made possi ble

Effect of snowbrush on the establishment and growth of Douglas-fir seedlings

Creator:: Scott, William
Abstract:: Six, recent clear cut areas were selected in the Douglas-fir zone of the Western Cascade Range of Oregon to determine the environmental and nutritional effects that snowbrush has on the establishment and growth of Douglas-fir seedlings. One thousand eighty milacre sample plots on the six clear cuts were used to...
Resource Type:: Masters Thesis
Full Text:: major pro- fessor, Dr. C. T. Youngberg, for suggesting this project and for his interest and

Growth rate of wheat (Triticum aestivm L., var. Gaines) as a function of moisture stress and nitrogen supply

Creator:: Amujo, Stephen Jimo
Abstract:: The effect of moisture stress and nutrients on the rate of growth of wheat (Triticum aestivum L. Var. Gaines) seedlings was studied. A special apparatus in which the moisture stress of several perlite cells could be maintained constant by osmotic solutions was used. Predetermined amounts of nitrogen were added to...
Resource Type:: Masters Thesis
Full Text:: , Dr. C. T. Youngberg and Dr. C. Davey and my minor professor, Dr. W. Chilcote for their advice on

ScholarsArchive@OSU

Nitrogen 15 studies with nonleguminous nitrogen-fixing plants

Soil-site relationships in second growth Douglas-fir stands in the central Oregon coast range

Effect of thinning Douglas-fir on soil moisture, temperature and nitrogen relations

First year development of three conifers on surface and exposed subsoil horizons

Nutrient uptake by conifer seedlings as influenced by root CEC and competing species

The role of certain non-leguminous woody species in the nitrogen nutrition of some conifer seedlings

Amount and chemical composition of understory vegetation in Alsea basin forest communities

The relationship of the survival of Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco, seedlings to certain soil and other site characteristics on the Tillamook Burn

Effect of snowbrush on the establishment and growth of Douglas-fir seedlings

Growth rate of wheat (Triticum aestivm L., var. Gaines) as a function of moisture stress and nitrogen supply

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