The Effects of Negative Air Ions on Plant Growth1

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S. L. Wachter Department of Horticultural Science and Landscape Architecture, University of Minnesota, St. Paul, MN 55108

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R. E. Widmer Department of Horticultural Science and Landscape Architecture, University of Minnesota, St. Paul, MN 55108

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S. L. Wachter Department of Horticultural Science and Landscape Architecture, University of Minnesota, St. Paul, MN 55108

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R. E. Widmer Department of Horticultural Science and Landscape Architecture, University of Minnesota, St. Paul, MN 55108

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Contributor Notes

Received for publication October 7, 1975. Paper No. 9239 Scientific Journal Series, University of Minnesota Agricultural Experiment Station, University of Minnesota, St. Paul, Minnesota.

Former Graduate Student and Professor, respectively. The authors wish to acknowledge the loan of ionization equipment and a financial contribution by Clean Air Systems, Inc., Rochester, Ill., which helped make this study possible.

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