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The Germination Of Weed Seeds As Influenced By Environmental Factors, Edna Pauline Mertz
The Germination Of Weed Seeds As Influenced By Environmental Factors, Edna Pauline Mertz
Electronic Theses & Dissertations
The problem involved in this investigation was that of determining the effect of environmental factors upon the germination of twelve species of weed seeds. The seeds were harvested, divided into three groups designated as Groups I, II and III, and stored under different environmental conditions. Group I, a temperature control group, was stored under conditions of normal temperature, Group II under continued cold and Group III was subjected to intermittent freezing and thawing. A small fourth group, consisting of seeds of species which failed to germinate or showed low percentages of germination in earlier tests was subjected to scarification. These …
Sampling Studies In Morning Glory Roots, Lowell W. Rasmussen
Sampling Studies In Morning Glory Roots, Lowell W. Rasmussen
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Farmers and agriculturalists have in recent years become more conscious of the seriousness of the weed problems. The solution of this problem is obviously the development of more efficient and less costly methods of eradication. Most pernicious weeds are propagated vegetatively by means of underground parts in which reserve food is stored as a source of energy in tiding the plant over winter and initiating spring growth each year. In order to get at the behavior of these perennial parts, it is necessary to resort to a study of root reserves. This involves information not only on the composition of …
Mitosis In Leaves, Bernice Marguerite Speese
Mitosis In Leaves, Bernice Marguerite Speese
Dissertations, Theses, and Masters Projects
No abstract provided.