Thesis (Ph.D.) - University of Queensland, 2005. / Includes bibliography.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1958. / Typescript. Abstracted in Dissertation abstracts, v. 19 (1958) no. 6, p. 1157-1158. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 126-134).

The aims of this study were to compare 16 Atriplex accessions as fodder shrubs; to find a method of vegetative propagation for A. nummularia and A. canescens; and to find a non destructive way of monitoring dry matter (DM) production and structure. Characteristics evaluated included DM yield, structure, nutritive value and adaptation to different ecological conditions. The accessions were also compared for palatability using grazing sheep in a cafeteria system. Two methods of vegetative propagation were evaluated, namely in vitro tissue culture propagation (A. canescens and A. nummularia) and stem cuttings (A. nummularia). With all accessions the percentage leaves decreased and percentage twigs increased as the plants matured. Leaves were more nutritious than edible twigs. At an age of 15 months edible DM yield ranged from 0.71 t.ha-1 (A. canescens Rincon) to 5.78 t.ha-1 (A. rhagadioides). For most accessions crude protein (CP) content, neutral detergent fibre (NDF), in vitro DM digestibility (IVDMD) and ash contents were acceptable for livestock. The two most promising accessions were A. nummularia (CP content 15%, NDF 48%, IVDMD 60% and ash 20%) and A. canescens cultivar Santa Rita (CP content 13%, NDF 49%, IVDMD 58% and ash 18%). The two least promising accessions as fodder shrubs were A.glauca (CP content 8%, NDF 61%, IVDMD 42% and ash 16%) and A. canescens Rincon (CP content 10%, NDF 58%, IVDMD 44% and ash 15%). Survival at different locations were not only influenced by ecological and climatological conditions, but also by different management practices. Average survival ranged from 41% to 87%. Sampling for nutritive value varied between locations and had a stronger influence on the nutritive values than location. Accessions with the broadest adaption were A. amnicola, A. canescens (S.R.), A. halimus and A. nummularia. According to visual observation and utilization, A. amnicola, A. canescens (S.R.), A. cinerea, A. rhagadioides and A. semibaccata were the most palatable accessions. The sheep, contrary to expectations, were able to select equally nutritious diets over time. In vitro propagation of A. nummularia was more successful than A. canescens. The best medium for shoot multiplication and elongation for A. canescens was the Murashige and Skoog (MS) basal medium with 0.20 mg.1-l 6-benzylaminopurine (BA) and 1.0 mg.1-l naphthalene acetic acid (NAA), while a medium with 0.05 mg.1-l BA and 0.05 mg.1-l NAA was best for elongation and rooting. For multiplication of A. nummularia the MS basal medium with 0.20 mg.1-l BA and 0.05 mg.1-l NAA was the best, while the MS basal medium without any hormones was the best for elongation and rooting. Atriplex nummularia was successfully acclimatized. Vegetative propagation using stem cuttings was also possible for A. nummularia. The best results (up to 95% rooting) were obtained using terminal cuttings of new growth in the autumn or spring, treated with 3 g.kg-l indole-3 buteric acid (IBA). Suitable models for the prediction ofDM yield, using non-destructive measurements were found. The model: DM = 553.24X + 129.47, where, DM = dry matter yield (g.plant-l) and X = shrub volume (m3), gave very good predictions (r2 = 0.72; P = 0.0001). Other models, which were species specific, included: DM yield in relation to volume; height and diameter in relation to DM yield; and shrub volume related to DM yield, where each accession has its own intercept while, the slope were the same for all. Acceptable models were found for all accessions with the exception of A. semibaccata. Another model should be tested for this accession with its creeping growth form. / Dissertation (MSc Agric (Pasture Science))--University of Pretoria, 2000. / Production Animal Studies / Unrestricted

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no abstract provided by author / Master of Science

Call number: LD2668 .T4 1958 R37

The "unusual" behavior of agricultural land prices is the subject of considerable debate and controversy and is the object of this research. There is little doubt that land prices have been increasing steadily since 1959 and dramatically throughout the decade of the 1970's. However, there is widespread disagreement among economists, appraisers, and other interested parties as to the causes of the dramatic increases in land prices. Net agricultural income is undoubtedly an important factor in the agricultural land market. Yet, land prices have continued to increase in the face of steady and even declining net incomes. Other factors often considered as exerting considerable influences are inflation, pressures from an increasing population, incentives to attain economies of size through ranch enlargement, and capitalization of government farm program "payments" into land values. The objective of this research is to identify the factors that exert significant influence on agricultural grazing land sale prices in two Eastern Oregon counties and to assess the impact of changes in these factors on the selling price of grazing land. A single equation linear regression model is used to identify the factors that have a significant impact on the price of grazing land. The variables determined to be positively correlated to the price of grazing land are the productivity of the land, the price of feeder cattle, inflation, and the assessed value of real property included in the land sales. The price of hay is negatively correlated with the price of grazing land. The inclusion of public land (USFS and BLM) grazing privileges in the sale was found to have no significant effect on the price of grazing land. In addition, purchases for the purpose of ranch enlargement are occurring at lower prices than purchases for ranch establishment. The major limitations of this study are the restrictions placed on the sales that are analyzed and the problem of standardizing a measure of land productivity. The first limitation is defensible given the stated objectives of the study and the need to limit the analysis to a roughly homogeneous class of land sales. The latter limitation prohibits generalization of the results to other areas without appropriate standardization of the measure of land productivity. / Graduation date: 1979

Revised publication

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