Index Catalog // ScholarsArchive@OSU

Soil moisture and temperature relationships under fallow in eastern Oregon

Creator:: Russelle, Michael P.
Abstract:: Time of stand establishment is a critical factor affecting yields of winter wheat and barley in the fallow-crop rotation areas of the Pacific Northwest. Farmers in this winter-rainfall region are dependent on residual moisture in the seed zone for germination, because significant precipitation does not usually occur until after the...
Resource Type:: Masters Thesis

Glutamine synthetase and α-Amylase activity in germinating wheat under water stress

Creator:: Downes, Patricia Marion
Abstract:: An integrated study of growth, enzyme activity, and water potential of wheat seeds germinated under mild water stress conditions was conducted to observe the relationship among the three kinds of parameters studied. From the relationship, the cause(s) or mechanism(s) of water stress in plant growth may be enlightened. Two important...
Resource Type:: Masters Thesis

Estimators of seed yield and its components in a plant introduction nursery of tall fescue (Festuca arundinacea Schreb.)

Creator:: Deffinbaugh, Daniel D.
Abstract:: The objective of this study was to identify visual or easily measured morphological characters associated with seed yield or its components in a spaced-plant nursery of tall fescue (Festuca arundinacea Schreb.). In 1977, 26 plant characteristics were observed on 210 plants from seven different geographic regions of origin. Each origin...
Resource Type:: Masters Thesis

The influence of certain environmental and edaphic factors on germination and emergence of Bromus tectorum L.

Creator:: Thill, Donald Cecil, 1950-
Abstract:: The influence of certain environmental and edaphic factors on the germination and emergence of downy brome (Bromus tectorum L.) was investigated in the laboratory. A preliminary study was conducted to determine the osmotic stability of mannitol and polyethylene glycol 20,000 (PEG) solutions, which are commonly used to simulate water stress...
Resource Type:: Dissertation

Effect of moisture stress on yield and quality of winter wheat seed

Creator:: Assuncao, Marcos Vinicius
Abstract:: Two experiments were conducted to determine the effects of moisture stress on physiological changes that occur during the vegetative and reproductive stages of the wheat (Triticum aestivum L.) plant, and to relate these effects to seed yield, quality and performance. In a field experiment, different levels of moisture stress were...
Resource Type:: Dissertation

Estimates of heterosis for five agronomic traits in selected winter x spring and winter x winter wheat crosses (Triticum aestivum L. em Thell)

Creator:: Brajcich, P.
Abstract:: Concern regarding the lack of genetic variability and the apparent yield plateau reached in wheat breeding have prompted this investigation. The systematic crossing of spring and winter wheat types which have evolved to form somewhat different gene pools, may provide a source of additional usable genetic variability for future yield...
Resource Type:: Masters Thesis

Factors influencing barnyardgrass (Echinochloa crus-galli) control with diclofop

Creator:: West, Lynn Douglas
Abstract:: Diclofop (2- [4 -(2, 4-dichlorophenoxy)phenoxy] propanoic acid), formulated as the methyl ester, selectively kills barnyardgrass [Echinochloa crus -galli (L.) Beauv.] in several crops when applied postemergence. Studies were conducted to determine the effect of soil moisture, barnyardgrass age, and site of exposure on control of barnyardgrass with diclofop. Soil moisture...
Resource Type:: Dissertation

Grazing duration effects on seed yield of annual ryegrass (Lolium multiflorum L.)

Creator:: Young, William C. (William Clyde)
Abstract:: Spring grazing of annual ryegrass (Lolium multiflorum L.) seed fields with sheep is a common practice in the Willamette Valley of Oregon. However, the effect of grazing on seed yield in Oregon has not previously been investigated. This experiment was designed to determine the effects of duration of spring grazing...
Resource Type:: Masters Thesis

CER and leaf characteristics of four tall fescue (Festuca arundinacea Schreb.) selections differing in forage yield

Creator:: Cohen, Cynthia Joy
Abstract:: Gas exchange, leaf area development, leaf anatomy and stomatal characteristics of four tall fescue selections differing in forage yield were examined to provide further insight into characteristics associated with yield differences of these selections. Winter-growing TFM 26 and TFM 16, the highest and lowest-yielding selections, respectively, and summer-growing selections TFK...
Resource Type:: Masters Thesis

Estimates of heterosis in winter/winter, winter/spring, and spring/spring crosses of barley (Hordeum vulgare L.)

Creator:: Oakley, Stephen Roland
Abstract:: Previous work indicated a substantial heterotic expression for grain yield existed within winter/spring hybrids of barley, This research was a continuation for the comparison of the expression of heterosis within winter/spring hybrids to the heterotic effect produced among the winter and among the spring parents. The F₁ and F₂ progenies...
Resource Type:: Masters Thesis

ScholarsArchive@OSU

Soil moisture and temperature relationships under fallow in eastern Oregon

Glutamine synthetase and α-Amylase activity in germinating wheat under water stress

Estimators of seed yield and its components in a plant introduction nursery of tall fescue (Festuca arundinacea Schreb.)

The influence of certain environmental and edaphic factors on germination and emergence of Bromus tectorum L.

Effect of moisture stress on yield and quality of winter wheat seed

Estimates of heterosis for five agronomic traits in selected winter x spring and winter x winter wheat crosses (Triticum aestivum L. em Thell)

Factors influencing barnyardgrass (Echinochloa crus-galli) control with diclofop

Grazing duration effects on seed yield of annual ryegrass (Lolium multiflorum L.)

CER and leaf characteristics of four tall fescue (Festuca arundinacea Schreb.) selections differing in forage yield

Estimates of heterosis in winter/winter, winter/spring, and spring/spring crosses of barley (Hordeum vulgare L.)

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