Thesis (M. Appl. Sci.)--University of Adelaide, Dept. of Agronomy and Farming Systems, 1999. / Includes bibliographical references (leaves 124-136).

Thesis (Ph. D.)--University of Western Australia, 2006.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1969. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

No description available.

No description available.

The study of the effects of cropping systems on buried weed seed is very costly. Most of the experiments of this nature were conducted prior to the introduction of herbicides. New techniques, material and methods are needed and could result in more research in this area of study. A polyester material was experimented with which provided a means for mechanically washing buried weed seed packets. This was accomplished through the development of an experimental seed packet washer. The washer and the polyester material made it possible to wash the soil from delicate seedlings growing inside the packets without damage to them. They in turn could be examined without removal from the seed packets making the procedure many times more economical. A seed removal technique was also developed which worked well in separating weed seed from mineral soil samples. This was accomplished by making slight modifications in the experimental seed packet washer regarding screening,.slope, water volume and the usage of various sizes of soil sieves. An economical bioassay method for studying the effects of crop leachates on red sorrel and rice germination and growth was also developed while simultaneously testing cropping system effects on buried weed seed in the greenhouse and field. This method and technique holds promise for other types of plant experiments involving liquid and culture media. Thirty-seven monoculture cropping systems were tested in the greenhouse and fourteen in the field for their effects on nine different buried weed seed species. Evidence is provided to show that broccoli, beans, asparagus, quackgrass, tomatoes and other plants fray be inhibitory to the subsequent germination and viability of the buried seed of Rumex acetosella L., Rumex crispus L., Brassica campestris L. and Amaranthus retroflexus L. / Graduation date: 1975

Typescript. / Thesis (Ph. D.)--University of Hawaii at Manoa, 1975. / Bibliography: leaves 129-138. / xii, 138 leaves ill. (some col.)

Thesis (Ph. D.)--University of Missouri-Columbia, 2008. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on July 22, 2009) Includes bibliographical references.

Thesis (M.S.)--University of Wisconsin--Madison, 1968. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1983. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.