The objective of this study was to formulate a management system for improving early Quebec tomato yields through the use of polyethylene row tunnels and the screening of three tomato genotypes for their performance under a tunnel system of growing. / Three tomato (Lycopersicon esculentum Mill.) cultivars, Springset (early, cold-tolerant), Celebrity (standard), and Hope No. 1 (early, heat-tolerant), were grown under clear or white perforated polyethylene row tunnels that were either vented ten days prior to anthesis to maintain temperatures below 30$ sp circ$C or nonvented. Controls had no tunnel treatment. / Springset had the highest harvest index and subsequent highest early yield. Celebrity had the highest total yield. Hope was not suited to producing early yield under the frequent low temperature conditions occurring during the spring in Quebec. Tunnels did not improve early or total yield. / Further research is required before tunnels can be recommended for producing early tomatoes in Quebec.

Field experiments were established during the 1988 and 1989 growing seasons, to determine the effect of mini-tunnel management systems on floral development and fruit set of tomato (Lycopersicon esculentum Mill.). Two types of floral abnormalities reported to be caused by temperatures above 30$ sp circ$C were observed, namely: style exsertion and splitting of the antheridial cone. Clear vented and white non-vented mini-tunnels reduced the incidence of both these abnormalities compared to the controls in 1988. As a consequence these two types of mini-tunnels also had the greatest percentage fruit set and total marketable yield of the first three clusters. In 1989, none of the mini-tunnels tested significantly increased percentage fruit set or marketable yield. The cultivar Springset produced ripe fruits an average of 4 days before Hope#1 and 7 days before Celebrity in both 1988 and 1989.

Thesis (Ph. D.)--Oregon State University, 2009. / Printout. Includes bibliographical references (leaves 130-141). Also available on the World Wide Web.

Thesis(M.S.)--Auburn University, 2007. / Abstract. Vita. Includes bibliographic references.

Thesis (Ph. D.)--Ohio State University, 2004. / Title from first page of PDF file. Document formatted into pages; contains xv, 176 p.; also includes graphics (some col.) Includes bibliographical references (p. 169-176). Available online via OhioLINK's ETD Center

Thesis (Ph. D.)--University of Chicago, 1917. / "This bulletin is the result of the cooperative efforts of Messrs. Kraus and Kraybill and has been submitted by them in fulfillment of the thesis requirements for the degree of Doctor of Philosophy from the University of Chicago." Includes the t.p. of the original issue. "Private edition, distributed by the University of Chicago Libraries, Chicago, Illinois." "Reprinted from Station bulletin 149, Oregon Agricultural College January, 1918." Bibliography: p. 87-90.

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Call number: LD2668 .T4 1953 P35 / Master of Science