Life Sciences Commons^™

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 …

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 …

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 …

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. …

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.