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Open AccessArticle

Use of Diatomaceous Earth as a Silica Supplement on Potted Ornamentals

Department of Horticulture & L.A., Oklahoma State University, Stillwater, OK 74078, USA
Department of Statistics, Oklahoma State University, Stillwater, OK 74078, USA
Author to whom correspondence should be addressed.
Horticulturae 2019, 5(1), 21;
Received: 28 January 2019 / Revised: 15 February 2019 / Accepted: 22 February 2019 / Published: 1 March 2019
PDF [228 KB, uploaded 1 March 2019]


The role of silica as a needed supplement in soilless media is gaining interest. This research studied the effects of diatomaceous earth as a supplement on growth and flower characteristics, physiology, and nutrient uptake in dahlia (Dahlia Cav. × hybrida ‘Dahlinova Montana’), black-eyed Susan (Rudbeckia hirta L. ‘Denver Daisy’), and daisy (Gerbera jamesonii L. ‘Festival Light Eye White Shades’). Plants were either well-watered at 10 centibars or water-stressed at 20 centibars. Silicon treatments included top-dressed at 20, 40, 60, and 80 g, or incorporated at 50, 100, 150, and 200 g, in Metro-Mix 360 media without silica plus a control and one treatment of new Metro-Mix 360 with silica already incorporated. Significant effects were seen from diatomaceous earth supplementation, irrigation, and interaction in all plants; growth and flower characteristics, leaf nutrient content, and tolerance to stress were improved by application of diatomaceous earth. An increase in leaf N, P, K, Mg, and Ca was observed for dahlia ‘Dahlinova Montana’ and black-eyed Susan ‘Denver Daisy’. Transpiration was maintained in all three species due to silica supplementation under water-stress. Metro-Mix with silica was similar to the Metro-mix without silica and equivalent to most treatments with supplemental silica for all three species. View Full-Text
Keywords: greenhouse; metro-mix; Dahlia; Rudbeckia; Gerbera greenhouse; metro-mix; Dahlia; Rudbeckia; Gerbera
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Mills-Ibibofori, T.; Dunn, B.; Maness, N.; Payton, M. Use of Diatomaceous Earth as a Silica Supplement on Potted Ornamentals. Horticulturae 2019, 5, 21.

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