Thesis (M.S.)--West Virginia University, 2008. / Title from document title page. Document formatted into pages; contains viii, 65 p. : ill. Vita. Includes abstract. Includes bibliographical references (p. 54-57).

No description available.

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 226-230).

Thesis (Ph. D.)--University of Wisconsin--Madison, 1954. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves [110]-116).

Thesis (Ph. D.)--University of Wisconsin--Madison, 1964. / Typescript. Vita. Description based on print version record. Includes bibliographical references.

Thesis--Wisconsin. / Vita. Includes bibliographical references.

Thesis (M.S.)--University of Wisconsin--Madison, 1967. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Four sampling techniques were evaluated to estimate clover aphid, Nearctaphis bakeri (Cowen), abundance in red clover fields in the Willamette Valley. The Berlese funnel method detected one to four times more aphids than other sampling techniques. Visual assessment often underestimated the high aphid densities during the flowering and seeding of clover. Sweep net and Schuh shaker techniques had limitations and underrated the numbers of aphids present in the clover fields. Strong correlations (r² = 0. 74 - 0.87) were found between the Berlese funnel technique and visual assessment technique in a 2nd year established field. Numerical differences in the spatial distribution of N. bakeri on clover stems were shown during various stages of plant development over the season. During development of buds and axils, aphid numbers on the lower half of the plant averaged 1.5 times greater than those on the upper half. As the season progressed into the flowering and seeding stage, aphid numbers on the upper stem halves were approximately five times greater than those on the lower half. Winged clover aphids were too few to show definite peaks of flight using water traps, averaging 2.19 aphids per yellow bucket during the June-August period. No significant differences in aphid attractiveness to the different colors were found among water pan traps. Yellow buckets captured approximately five times more alate aphids than did yellow, red, or green pan traps. Traps placed on the south side of the field contained higher numbers of aphids than in other locations in the red clover fields. / Graduation date: 1991

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In response to environmental concerns about NO3- leaching research has shifted toward the increased incorporation of nitrogen-fixing legumes, such as red clover, into agroecosystems to promote tighter cycling of nitrogen (N). Although more sustainable than fertilized systems, red clover still has the potential to contribute to leaching. The objective of this study was to ascertain the contribution of red clover to soil NO3- when grown in mixture with bluegrass. Soil solute samples were collected at 15 and 45 cm depth using ceramic suction lysimeters from two experimental pastures in Nova Scotia in 2009. The concentration of NO3--N in the soil solute of bluegrass-red clover mixtures was 10 to 25 times higher in Truro, and 5 to 16 times greater in Nappan, compared to the corresponding unfertilized pure bluegrass stand. Neither sub-surface irrigation nor two distinct red clover cultivar mixtures were found to significantly alter NO3- leaching patterns.