Received for publication April 21, 1978. Approved as journal article number 66-78 of the Ohio Agricultural Research and Development Center.
The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper must therefore be hereby marked advertisement solely to indicate this fact.
Associate Professor, Horticulture, Mailing address: 2001 Fyffe Ct., Columbus, OH 43210. Reprint requests should be sent to this address.
Extension Specialist, Agricultural Engineering and Professor, Environmental Horticulture, respectively.
The authors are indebted to the Society of American Florists Endowment for their financial support and to Sunny side Nurseries of Salinas, CA and Paul Ecke Poinsettias of Encinitas, CA for their support. Also, we extend our gratitude to Jeanne Jones, Terry Berger, Paul Orson, John Kubota and Dean Taylor for their efforts.