Thesis (Ph. D.)--University of Wisconsin--Madison, 1943. / Typescript. eContent provider-neutral record in process. Description based on print version record.

Thesis (M.S.)--University of Wisconsin--Madison, 1943. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaf 57).

Thesis (M.S.)--Oregon State University, 1986. / Typescript (photocopy). Includes bibliographical references (leaves 46-48). Also available on the World Wide Web.

Root and top development of an annual grass, barley (Hordeum sativum), and of three varieties of perennial grass, orchard grass (Dactylis glomerata) is followed during the first year from seeding. Reserve carbohydrate and lignin levels for both root and top at several dates are given. Attention is also directed towards the development of techniques for root study, and to root interactions of grass and legume seedlings in pure and mixed stands. / Land and Food Systems, Faculty of / Graduate

A biological method for the measurement of sod reserves was developed. A tool was constructed to obtain sod cores of 4" diameter and 4" deep. The cores were taken from lawns containing local bentgrasses, blue-grasses, fescues and ryegrasses, and from putting greens composed of local bentgrass strains. The cores were kept in a dark chamber. The etiolated grass was clipped periodically until the reserves in the cores became exhausted. The oven dry weight of clippings from a unit core area, the sod reserve index, was used as a measure of reserves. The sod reserve index was found to vary with species and varieties, soil conditions, management practices, amount of solar radiation, wear and compaction, and seasonal changes. Summer dormancy depressed the level of sod reserves. It appeared that photoperiod may play some role in controlling summer dormancy. The turf quality was directly related to the amount of reserves; therefore, the sod reserve index may be used as one of the objective measure of turf quality. The localization of reserves in the soil profile varied slightly with the species used, but the results indicated that only the upper one inch of the soil horizon has a major role as a storage zone for underground reserves. / Land and Food Systems, Faculty of / Graduate

Previous research has shown, that Orysopsis hendersoni shares two features with Stipa and one with Oryzopsiso. A study of floret development and embryology was undertaken in order to obtain more points for comparison. Most of the twenty-six features of O. hendersoni resulting from this study are characteristic of Stipa and not Oryzopsisa. Therefore, it is proposed that O. hendersoni be transferred to Stipa. Evidence from this and other studies demonstrates that grass locidules can be foliar, stamen-like, or intermediate and that the gynoecium is unicarpellate. These facts are contradicted by claims of homology based on hypothetical phylogenies. Because use of the concept of homology has led to general acceptance of misleading assumptions in these and other instances and because the concept of homology is ambiguous and superfluous, it should not be used. / Science, Faculty of / Botany, Department of / Graduate

No description available.

Thesis (Ph. D. - Renewable Natural Resources)--University of Arizona, 1990. / Includes bibliographical references (p. 177-197).

Thesis (M.S.)--Miami University, 2008. / Includes bibliographical references (p. 62-64).

Thesis (D.Sc.(Agric.))(Plant Production)--University of Pretoria, 1990. / Includes summary. Includes bibliographical references. Available on the Internet via the World Wide Web.