Medicine and Health Sciences Commons^™

Effects Of Planting Date, Harvest Date, And Environmental Conditions On Germination Of Forage Kochia Accessions, Cody F. Creech

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Forage kochia is used to re-seed areas in harsh environments that have been infested by annual weeds or disturbed by repetitive fires. It is an introduced perennial semi-shrub that is valuable to livestock and wildlife as a forage. The seed of forage kochia is very unpredictable and successful establishment in areas of low precipitation where it is utilized has often been erratic. Forage kochia seeding failures are costly and leave the land vulnerable to further degradation and erosion. This study was conducted to investigate how germination of forage kochia is affected by different harvest and planting dates, age of seed, …

The Relationship Between Salinity And Drought Tolerance In Turfgrasses And Woody Species, Nisa Leksungnoen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Both salt and water deficit make it difficult for plants to uptake water from soil. Thus, plants under those conditions may respond and deal with them similarly. The overall objectives of this study were to 1) determine visual appearance and physiological responses, and mechanisms to deal with salt and water deficit of turfgrasses and woody species, and 2) determine the relationship between salt and water deficit tolerance ability in those species.

Five turfgrass entries, ‘Gazelle’ and ‘Matador’ tall fescue (TF), ‘Midnight’ Kentucky bluegrass (KBG), PI368233 (Tolerant KBG), and PI372742 (Susceptible KBG), and three woody species, bigtooth maple (xeric-non saline), bigleaf …

Dissolution And Precipitation Of Gypsum In The Soil Under Irrigation, Badier J. Alawi

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Two soils were used in this soil column study. Yolo loam soil a non-calcareous, non-gypsiferous soil from central California and Vernal soil a calcareous soil from eastern Utah.

Initial studies were conducted where the solubilities of pure CaC0₃ and CaS0₄ ' 2H₂0 were determined in the presence of Logan river water, a KCl solution (2.8 mmhos/cm) and a K₂S0₄ solution (2. 7 mmhos/cm). Gypsum was more soluble in the KCl solution than in the K₂S0₄ solution. The solubility product of both gypsum and lime were determined from the analytical …

Potato Variety Trial As A Step Of A Potato Breeding Program, Gonzalo Claure-Vallejo

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A potato varietal trial, the equivalent of the final step in a potato breeding and testing program was conducted in 1972 at the Farmington Experimental Sub-station, Farmington, Utah. The test consisted of twelve named varieties and two numbered selections.

This study measured the yielding capacity of new potato varieties and selections during one growing season at one location in Utah. Yields were compared with those of the older accepted varieties grown in the state and used as control or standard varieties in the varietal trial.

This study provided valuable information for growers and processors in determining the suitability of these …

Proteolytic Enzymes Of Lactic Streptococci And Their Use In Improving Body And Texture Of Direct Acid Cottage Cheese, Gulamnabi Y. Vahora

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Proteolytic activity of Streptococcus cremoris HP, P₂ and AM₂; Streptococcus lactis-C₂, ML₈ and a commercial mixed culture was determined in skimmilk and whey by measuring the increase in Absorbency at 274.5 nm of a pH 4.6 soluble filtrate, following incubation in a 2.5% casein solution. Proteolytic activity, rate of acid production and growth rate decreased in order of C₂, HP, mixed culture, AM₂, ML₈ and P₂ at a regulated pH (6.1 - 6.2) and 32 C. Maximum proteolytic activity for all cultures was found during the stationary …

Mitochondrial Activity Of Hardened And Nonhardened Rye (Secale Cereale) Plants Exposed To Freezing Temperatures, Bryce D. Bennett

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Five day old dark-grown seedlings of Secale cereale variety "cougar" grown at 20 C were subjected to hardening at 2 C in daily increments from 0 to 7 days, to temperature stress at -5 C for 0, 1, and 3 days, and to recovery at 20 C for 0, 1, and 3 days. Unhardened plants were killed by temperature stress but as the time of hardening increased fewer plants were killed. After 5 days of hardening all plants survived subsequent freezing stress.

Mitochondria were isolated from the plants after they received various combinations of the three temperature treatments. There were …

Ice Nuclei Inventory: Wasatch Weather Modification Experimental Area, William F. Slusser

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Several large sources of ice nuclei were identified for the Wasatch Weather Modification Experimental Area. When stable air masses remained over the area for several days, ice nuclei concentrations as large as 1750 per liter (measured at -20 C) were found at the surface. Concentrations as large as 6000 per liter were measured with an airborne ice nuclei counter over the smelter industry of the Salt Lake Valley. Ice nuclei concentrations during storm periods were usually less than 3 per liter, indicating an excellent potential for increasing precipitation amounts over the Wasatch Mountains through the release of artificial ice nuclei. …

Boron Movement In Soil Columns, Joseph William Stucki

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Three adsorption theories--Langmuir, B.E.T., and Freundlich--were applied to boron interaction with Aiken clay loam and Vernal sandy loam soils to determine which bests describes the system.

Column studies were conducted to obtain constants related to mass fluid flow and fluid dispersion within the column. An inert ion was used to obtain the pore volume and to calculate the fluid dispersion coefficient. These data were used to solve the material balance equation by the explicit numerical method developed by Lai for a digital computer. The output from the computer was a predicted profile boron distribution within the soil column.

The soil …

Nitrogen Movement Under Irrigated Corn As Influenced By Nitrogen Source And Rate, Douglas C. Muir

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this study was to determine nitrogen movements under a fall applied fertilizer as affected by rate of application of fertilizer, type of fertilizer carrier, and by crop grown. Two nitrogen fertilizers, calcium nitrate and ammonium sulfate, were applied in the fall of 1970. The soil profile was sampled in the spring of 1971 and again in the fall of 1971. Nitrate-nitrogen from both the calcium nitrate and the ammonium sulfate applications was found to have moved significantly from the time of application to the time of spring soil sampling. Two effects from the high rate of both …

Nutrients And Phytoplankton In Hyrum Lake, Robert Bruce Murray

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The current investigation indicates that the routine appearance of a noxious blue-green algal bloom of Aphanizomenon flos-aquae, in Hyrum Lake, a reservoir in northern Utah is a result of excess phosphorus. Data indicate that the algal growth is initiated by phosphorus liberated from the phosphorus rich bottom sediments, and at a time when nitrogen is present in excess in the lake relative to phosphorus.

Results indicate that the Little Bear River is the major source of nitrogen and phosphorus contributing to the eutrophication of Hyrum Lake. Nitrogen and phosphorus fluctuations in the Little Bear River proved to be concurrent with …

The Overwintering Of The Fireblight Bacteria Outside Of Living Tissue In Utah, Sherman V. Thomson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this investigation was to determine the sites of overwintering of Erwinia amylovora (Burrill) Winslow et al. outside of living tissue in Utah. Bacterial isolates were taken from the surfaces of blighted twigs and mummified fruits remaining on the tree; also from internal dead tissue of blighted twigs and mummies, and from soil beneath blighted trees. Each isolate was tested for agglutination with antiserum specific for Erwina amylovora, susceptibility to Erwinia amylovora bacteriophage, production of symptoms in pear seedlings and development of bacterial ooze on green pears.

Both virulent and avirulent isolates were taken from all sites tested. …

Reed Canarygrass Germination At Five Seed Maturity Stages And Sixteen Seed Treatments, Richard N. Peaden

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Reed canarygrass (Phalaris arundinacea) has long been recognized as adapted to wetlands and those subject to periodic flooding. In Utah, Wilson (1955) estimate that 40 percent of the valley bottom land is flooded at least part of the year. Much of this land is very dry late in the summer. Forages such as Alsike clover tolerate flooding and some salt but do not perform well under drouth. Work by Bolton (1946) indicated that flooding for 49 day did not cause serious permanent damage to Reed canarygrass. The author has observed Reed canarygrass growing in a shallow reservoir which …

Factors Affecting The Translocation Of Herbicides In Mesquite (Prosopis Juliflora), Dale W. Young

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The control of mesquite is a major range problem in the Southwest. Mesquite is a thorny, woody shrub or tree that has infested 75 million acres of valuable range and pasture land in this region. It competes with grasses and other valuable plants for sunlight, moisture, and plant food. Mesquite also acts as a serious barrier to the handling of cattle on the range.

A Cyto-Taxonomic Study Of The Genus Geranium Within The Wasatch Region, Richard J. Shaw

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The western North American species of the genus Geranium have never been satisfactorily clarified. The perennial, indigenous species of this interesting group have been particularly confusing. One important reason for confusion in this group is the fact that the taxonomic problems of the perennial species have never been studied from the genetic point of view. A sound delimitation of specific and subspecific boundaries and phylogenetic relationships cannot be achieved without the application of cyto-genetic principles.

In respect to the cytological phase of this study, the author has placed emphasis on chromosome numbers in order to show evidences for and possible …

The Isolation Of Some Nonsymbiotic Nitrogen Fixing Organisms Occurring In Some Utah Soils, Richard B. Johnson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Plants require ten elements in appreciable quantity and several others in smaller amount for their continued and normal growth. Three of these necessary elements, nitrogen, phosphorus, and potassium are most important because they occur in the soil in quantities which are usually small in proportion to that needed by the plants. Of these three, nitrogen is in most cases the limiting factor because of the ease with which it may be leached from the soil and comparatively large amount assimilated by plants. These factors coupled with the inhibiting high cost of artificially replacing it in the form of commercial fertilizers, …

The Effect Of Different Methods Of Handling Chicken Manure On The Viability Of Weed Seed, Golden L. Stoker

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

It is well known that weeds spread and are perpetuated by means of seed and vegetative reproduction. The seeds in turn are spread by various agencies such as wind, water, animals and man. These agencies are aided by especially adapted seed mechanisms for dissemination.