Thesis (Ph.D.)--University of Adelaide, Dept. of Botany, 1973.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1957. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 68-70).

Thesis (M.S.)--University of Wisconsin--Madison, 1985. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 40-43).

Thesis (M.S.)--University of Nebraska-Lincoln, 2010. / Title from title screen (site viewed May 18, 2010). PDF text: 103 p. : ill. Publication: Theses, Dissertations, and Student Research in Agronomy and Horticulture. Includes bibliographical references.

Thesis (M.S.)--University of Wisconsin--Madison. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 60-66).

The use of Irrigated Pastures for the production of beef cattle in British Columbia is a relatively new venture. That they have a place in the ranch economy of the province is appreciated when it is realized that the natural range resources are being used to their fullest extent at the present time. Irrigated pastures provide a means of intensification of production and permit increased beef output from the limited land areas available in the province. The various methods of estimating pasture production through the use of grazing animals have been investigated. These investigations indicate the need for accuracy of experimental procedure since the variables encountered are numerous. The production of forage from irrigated pastures in 148 days was 4290.0 to 5011.8 pounds of total digestible nutrients per acre depending upon method used in calculation. The young succulent grasses and legumes encountered in irrigated pastures are high in protein with a corresponding deficiency in carbohydrate. The use of high energy supplementation may be worthy of further investigation. The incident of bloat and foot rot in animals on irrigated pasture can be a problem. Correct management procedures and prompt treatment will assist in alleviating these problems. / Land and Food Systems, Faculty of / Graduate

Thesis--Wisconsin. / Vita. Includes bibliographical references (leaves 92-96).

Thesis (Ph. D.)--University of Wisconsin--Madison, 1972. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

There is a desire to source novel legume species to combat the threat of dryland salinity to agriculture and the environment. There are already many legume weeds in temperate Australia and the potential negative impact of new species has created a justifiable impasse. Weed risk assessment presents a potential solution, but deficiencies in the current Australian system have hampered progress thus far. A greater emphasis on the impact of the weed species may be a means of solving this conflict. Therefore, this project attempted to predict the level of impact that a legume species would have upon temperate natural ecosystems. The weed impact of exotic legume species in natural ecosystems was determined by distributing a questionnaire to experts. Respondents reported that woody perennial legumes were more important than herbaceous legumes. Field measurements demonstrated that the abundance of legumes was correlated with their perceived impact in natural ecosystems. Thus, two test species lists were compiled, one of woody species and the other herbs. The woody species comprised three impact levels: major, moderate and no impact. The herbaceous species also comprised three lower impact levels: consequential, inconsequential and no impact. The identification of legume species with differing levels of impact subsequently allowed them to be compared with respect to a number of biological traits, with the aim of distinguishing impact groups based on these traits. Seedling growth was examined in the glasshouse under both high and low soil moisture. With high soil moisture, major and moderate impact legumes were distinguished by having a higher specific root length than no impact legumes. Consequential impact herbaceous legumes had lower specific leaf area than the lower impact groups. Moisture stress did not alter the comparisons between impact groups. Five reproductive traits were explored through a mixture of experimental, field sampling and literature research. Major and moderate impact legumes had a shorter juvenile period, higher seed dormancy, a smaller seed mass and higher seed production than no impact legumes. Major and moderate impact legumes could be differentiated by their seed mass and seed production. Consequential and inconsequential impact herbaceous species had higher seed production and seed dormancy than no impact species. To allow for important interactions with the environment, the ability of the test legumes to establish in temperate natural ecosystems with and without physical disturbance was studied. This provided some test of the conclusions reached from individual trait studies. The highest impact legumes were the most successful at establishing in the natural ecosystems studied. Disturbance had a positive effect on establishment, except for the major impact group where disturbance was not important. This study was able to highlight that for a legume to successfully naturalise in temperate Australia it must possess certain biological traits. Less success was achieved in distinguishing naturalised legumes of differing impact. However, growth form is important and seed mass appears a significant trait in regard to woody species. Both are easily measured traits and could be incorporated in weed risk assessment of legumes in the future. / http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1284153 / Thesis (Ph.D.) -- University of Adelaide, School of Agriculture, Food and Wine 2007

Thesis (Ph.D.) -- University of Adelaide, Dept. of Applied and Molecular Ecology, 2000. / Bibliography: leaves 108-152.