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An Ecological Survey Of The Vascular Aquatic Vegetation Of The Cumberland Plateau In Tennessee, Franklin Delano Robinson

Masters Theses

A study of the vascular aquatic plants in the Cumberland Plateau in Tennessee was mad e during the summer of 1955. The purpose of this study was to find out the distribution of species in this area and try to learn some of the conditions under which the species involved survive. The species list for the area was arranged in alphabetical order under group headings according to the most frequently observed habit or position of growth. Under each species name the range and mean values determined for the carbon dioxide content, total acidity, total alkalinity, and pH of the surrounding …

The Interrelation And Interaction Of Allenrolfea Occidentalis And Its Edaphic Environment, Blaine H. Quigley

Theses and Dissertations

To understand more fully how Allenrolfea occidentalis (S . Wats . ) Kuntze tolerates high salt concentrations and why it grows in hummocks, this study was undertaken . Allenrolfea is a shrubby member of the Sa licorneae subfamily of the Chenopodiaceae family , with practically leafless green succulent stems and inconspicuous flowers .

A Study Of The Effect Of Three Nutrients On The Growth Of Tomatoes, Walter B. Stone

Biology ETDs

Studies of the various phases of plant growth are becoming more and more important to plant physiologists. Many such studies have been conducted for economic reasons to obtain increased production. In this investigation, fruit production and quality have been considered important, but have been placed second in interest to the effect certain nutrients may have on plant development during growth.

Most experiments of this type have been concerned with nutrient deficiencies. The writer has attempted in this experiment to use nutrient elements in excess and observe the effects produced during progressive phases of plant growth. Single elements, nitrogen, phosphorus, and …

Salt Tolerance Studies Of Selected Crop Plants, Cyril Reed Funk Jr.

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Extensive land areas in arid and semi-arid regions contain excessive amounts of salt which inhibit or prevent the growth of desirable crop plants. This problem is increasing with the development of extensive irrigation projects. The future of irrigation agriculture will depend upon the development and the utilization of means of (1) preventing salt accumulation, (2) reclaiming salted soils, and (3) making the best use of those soils which by reason of drainage problems, soil texture and permeability, poor quality irrigation water, etc. are unsuited for economic reclamation.

The utilization of land that is not feasible to completely reclaim, at least …

Red Raspberry Root Rot In Northern Utah, Robert L. Powelson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

During the last few years, red raspberry growers in Utah have been finding that plantings gradually lose vigor and are not profitable. In the largest raspberry growing area in Utah, Utah County, figures taken from the U.S. census from 1930 to 1950, show a decrease in acres of raspberries grown from 401 in 1930 to 190 in 1950 (2). In many instances this deterioration of raspberry plantings in Utah has not been definitely associated with known plant pathogenic fungi or virus infections. Neither can the expansion of suburbs account for this decrease. In certain cases it has been obvious that …

The Effect Of The Water Extracting Requirement Upon The Fertilizer, Yield And Growth Response Of Sweet Corn, Roberto Vazquez

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

There are a number of factors that influence crop yield, two of which are soil moisture and fertility.

Root Yields, Sucrose, And Glutamic Acid Content Of Sugar Beets As Influenced By Soil Moisture, Nitrogen Fertilization, Variety, And Harvest Date, Donald G. Woolley

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The United States produces about 1.8 million tons of sugar annually. Approximately 75 per cent of this production is derived from sugar beets. The importance of the sugar beet crop in national and world economy is justification for research effort as a means to more economical production.

It is desirable that sugar beet processing be carried out in the most efficient manner. More effective utilization of the sugar beet and its by-products will add stability to the sugar beet industry.

For the past 170 years, since Achard found that sugar could be used for human consumption and that pulp might …

The Inheritance Of Certain Morphological Characters Of The Barley Spike, Donald C. Rasmussen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Plant breeding, in its simplest form, began thousands of years ago. Since then it has grown into a science of immense practical importance with vast strides made possible by continued research.

A Study Of The Variability Of Distichlis Stricta Selections From Several Geographical Locations In The Western United States, Arlan Kent Nielson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Distichlis stricts as indicated by the available literature is rather unpalatable, but has the ability to grow vigorously on wet, saline, or alkali soils where more palatable species will not survive. D. stricts can be eradicated quickly where drainage and cultivation can be practices, but there are thousands of acres in the United States, Canada, Mexico, and Argentina where cultivation or drainage are impractical or impossible.

On such problem soils, where the majority of the vegetation consists largely of D. stricts, a great deal of benefit would be derived from any improvement in the forage quality of this species. …

A Comparison Of Devices For Measuring Soil Moisture Tension And Their Effectiveness In Predicting Irrigation Requirements In The Field, Modesto Capiel

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Many problems of management of irrigated soils require a knowledge of the soil moisture status and its relationship to plant growth before they can be solved.

The amount of water in the soil as indicated by moisture content gives no reliable information of its availability for plant growth. It is therefore desirable to obtain a direct measurement of the readiness with which soil water can be obtained by the plant

the "field capacity" and the "wilting percentage" have been helpful in estimating the amount of soil water that can be used by plants.

Soil sampling has been used extensively to …

On The Kinetics Of Moisture Flow In Unsaturated Soils, James Wellington Biggar

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The flow of fluids in porous media continues to be a widely studied phenomenon. Soil moisture relationships and particularly the flow of water in soil is perhaps the most widely investigated of the four edaphatic factors related to plant growth, namely moisture, aeration, temperature and compaction.

Tannin Content Of English Walnuts : Thesis ..., Joseph G. Natoli

University of the Pacific Theses and Dissertations

Present methods for the production of leather from animal hides still depend from the most part on the use of natural tannin extracts. During the year, 1952, the amount of natural tannin extracts used by the leather industry was 560,452,119 pounds as compared to 35,793,000 pounds of synthetic tanning materials. It is not as yet possible to produce synthetic materials as economically as the natural extracts; the result being that there is still a very great demand for natural tannin extracts. The need for finding new domestic sources of tannins is apparent when the amounts of domestic and imported extracts …

Cytogenetic Studies In The Genus Cymbidium, Donald E. Wimber

CGU Theses & Dissertations

The orchids known today make up one of the largest Angiospermous families in the world. Recent estimates place the number of genera at about 450 which estimates between 10,000 and 15,000 species (some authorities go as high as 20,000). They are without doubt one of the most highly specialized groups of green plants. Botanically the flowers are of more than passing interest for they deviate so distinctly from the norm of the Monocots. They are the possessors of a number of unique structures that are found in no other family of flowering plants.