Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)

Department / School



Previous to 1940, sodium chlorate, certain boron compounds, and arsenic compounds were established as soil sterilants. Immediately prior to this time, the use of sulphuric acid and substituted phenols had attracted some attention and favor as selective herbicide. When 2, 4-D (2,4-dichlorophenoxyacetic acid) becomes available as an herbicide its spectacular efficiency not only facilitated its wide acceptance but also aroused a new and greater interests in chemical weed control. In response to demand for new herbicides to meet the recognized inadequacies of 2, 4-D and the older herbicides, many chemicals of possible herbicidal value are now being synthesized and screened by numerous formulators. The procedures of screening vary from simple single plant laboratory tests to extensive greenhouse and field trials. None of these procedures are completely satisfactory in that they were developed to estimate a reaction similar to that exhibited by hormone type growth regulators such as 2, 4-D. This paper reports a laboratory screening test designed to give an adequate evaluation of chemical compounds with respect to their herbicidal potentialities. The basis for this test was derived from earlier work done with systemic growth regulators, and it was recognized that the various compounds to be tested might not all react in a similar manner. Greenhouse trials with the same chemicals were run simultaneously to check the accuracy and reliability of the laboratory test.

Library of Congress Subject Headings

Plants, Effect of poisons on


Includes bibliographical references



Number of Pages



South Dakota State University


No Copyright - Non-Commercial Use Only