Index Catalog // ScholarsArchive@OSU

An evaluation of biological control of Linaria dalmatica with Mecinus janthinus in Oregon

Creator:: Park, Alexander
Abstract:: Dalmatian toadflax (Linaria dalmatica) has become a prolific invasive plant of rangelands in Oregon since its arrival in the early 20th century. In 2001, the Oregon Department of Agriculture initiated a release program promoting the distribution of the stem-boring weevil, Mecinus janthinus as classical biological control agent to reduce densities...
Resource Type:: Masters Thesis
Full Text:: : ______________________________________________________ Douglas E. Johnson Dalmatian toadflax (Linaria dalmatica) has become a prolific invasive

Evaluation of germination responses and early seedling development of selected medicago and hedysarum species

Creator:: Jabbes, Mohamed
Abstract:: Germination strategies and early seedling development of selected Medicago and Hedysarum species were evaluated to identify plants with high potential for range rehabilitation in central Tunisia. Temperature (5°C to 25°C) and water stress (0 MPa to -0.8 MPa) affected the germination percentage of all Medicago and Hedysarum species. Water stress...
Resource Type:: Masters Thesis
Full Text:: Approved: Redacted for Privacy Do las E. n on Germination strategies and early seedling development of

Dietary compostion and nutritional status of sheep and goats grazing two rangeland types in Baluchistan, Pakistan

Creator:: Wahid, Abdul
Abstract:: The main objective of this research was to assess the nutritional status of sheep and goats grazing two rangeland types in Baluchistan, Pakistan. These types were Artemisia maritima/Haloxylon griffithii association represented by the Zarchi Field Station and Cymbopogon shoenanthus, found at the Tomagh Field Station. Seasonal above ground biomass production...
Resource Type:: Dissertation
Full Text:: guidance filled the gaps in my professional personality. Dr. D. E. Johnson, my major professor, is a

Diet selection by conditioned and unconditioned goats in the sagebrush steppe of Eastern Oregon

Creator:: Richman, Lesley M.
Abstract:: This research examined the diets of angora goats on a sagebrush bunchgrass rangeland. Research objectives were to 1) determine the effects of a positive conditioning method on both mature and immature angora goats; and 2) to quantify plant selection and provide preliminary information as to the potential for using goats...
Resource Type:: Masters Thesis
Full Text:: . My deepest, most heartfelt thanks to my major professor, Dr. Douglas E. Johnson, who was 100

Identification of restoration potential on southwestern Oregon rangelands

Creator:: Barrington, Mack R.
Abstract:: The objectives of this research were to 1) evaluate the establishment and peak standing crop of Berber Orchardgrass (Dactylis glomerata var. "Berber"), Palestine Orchardgrass (Dactylis glomerata var. "Palestine"), and Sheep Fescue (Festuca ovina var. "Covar") ; 2) to assess establishment and production changes resulting from environmental gradients (elevation, slope, aspect,...
Resource Type:: Dissertation
Full Text:: . Douglas Johnson for his unfailing support and guidance through the dark before the dawn. Thanks Doug for

Cattle herd dynamics and performance under village husbandry in the Kolda region (Southern Senegal)

Creator:: Sissokho, Mohamadou M.
Resource Type:: Masters Thesis
Full Text:: opportunity to pursue this degree. My sincere thanks to my major Professor Dr. Douglas Johnson and to my

Standing crop dynamics and productive potential of southwestern Oregon rangelands

Creator:: White, G. R.
Resource Type:: Masters Thesis
Full Text:: help with the statistical analysis. CONTRIBUTION OF AUTHORS Dr. Douglas E. Johnson helped

Cattle behavior and distribution on the San Joaquin Experimental Range in the foothills of central California

Creator:: Harris, Norman Rex
Abstract:: Small herds of cows were observed and spatially mapped over continuous twenty-four hour periods. Treatments were implemented that investigated the effect of water site and supplementation on animal distribution patterns. A series of six observation periods constituted each observation series. Observation series were repeated winter (January) and summer (July) for...
Resource Type:: Dissertation
Full Text:: manuscripts. Dr. Douglas E. Johnson helped design and establish the experiment, observe animals, analyze data

Morphological variability and seed dormancy of Amelanchier (Rosaceae) grown in Oaxaca, Mexico

Creator:: Cruz-Cruz, Efrain
Abstract:: The purpose of this research was to determine whether hybridization between Amelanchier denticulata. (H.B.K.) Koch and Amelanchier nervosa (Decaisne) StandL occurs in Oaxaca, Mexico, and to evaluate components of yield and germination characteristics and seed dormancy of Amelanchier denticulata. Amelanchier nervosa and Amelanchier denticulata samples and morphological characters were used...
Resource Type:: Dissertation
Full Text:: . Douglas E. Johnson for his insight and advise through the process ofmy studies; especially, for his time

The use of remote sensing and Geographic Information Systems (GIS) in assessing changes in stream morphology and vegetation

Creator:: Laliberte, Andrea S.
Abstract:: Remote sensing and Geographic Information Systems (GIS) are well known tools for the study of time change analysis in natural systems. However, long-term studies of riparian systems using large-scale aerial photography are less common. The purpose of this project was to combine large scale aerial photography, GIS, Global Positioning Systems...
Resource Type:: Masters Thesis
Full Text:: . Douglas Johnson, my major professor, whose support and help went beyond his duties as an advisor. I

ScholarsArchive@OSU

An evaluation of biological control of Linaria dalmatica with Mecinus janthinus in Oregon

Evaluation of germination responses and early seedling development of selected medicago and hedysarum species

Dietary compostion and nutritional status of sheep and goats grazing two rangeland types in Baluchistan, Pakistan

Diet selection by conditioned and unconditioned goats in the sagebrush steppe of Eastern Oregon

Identification of restoration potential on southwestern Oregon rangelands

Cattle herd dynamics and performance under village husbandry in the Kolda region (Southern Senegal)

Standing crop dynamics and productive potential of southwestern Oregon rangelands

Cattle behavior and distribution on the San Joaquin Experimental Range in the foothills of central California

Morphological variability and seed dormancy of Amelanchier (Rosaceae) grown in Oaxaca, Mexico

The use of remote sensing and Geographic Information Systems (GIS) in assessing changes in stream morphology and vegetation

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