Ammonium Injury to Poinsettia: Effects of NH4-N:N03-N Ratio and pH Control in Solution Culture on Growth, N Absorption, and N Utilization

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Douglas A. Cox Department of Floriculture and Ornamental Horticulture, Cornell University, Ithaca, NY 14853

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John G. Seeley Department of Floriculture and Ornamental Horticulture, Cornell University, Ithaca, NY 14853

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Douglas A. Cox Department of Floriculture and Ornamental Horticulture, Cornell University, Ithaca, NY 14853

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John G. Seeley Department of Floriculture and Ornamental Horticulture, Cornell University, Ithaca, NY 14853

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Contributor Notes

Received for publication 18 May 1983. This paper represents a portion of a dissertation submitted by the senior author in partial fulfillment of the requirements for the PhD degree. Appreciation is expressed to the Fred C. Gloeckner Foundation, Inc., New York, N.Y. for financial support and Paul Ecke Poin-settias, Encinitas, Calif, for plant material. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.

Former Graduate Research Assistant. Currently Assistant Professor of Horticulture (to whom reprint requests should be sent), Auburn University, Auburn, AL 36849.

Professor.

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