Growth and Nutrition of Geraniums Grown in Media Developed From Waste Tire Components

in HortScience
Authors:
Steven E. NewmanDepartment of Horticulture and Landscape Architecture, Colorado State University, Fort Collins, CO 80523-1173

Search for other papers by Steven E. Newman in
ASHS
Google Scholar
PubMed
Close
,
Karen L. PanterDepartment of Horticulture and Landscape Architecture, Colorado State University, Fort Collins, CO 80523-1173

Search for other papers by Karen L. Panter in
ASHS
Google Scholar
PubMed
Close
,
Michael J. RollDepartment of Horticulture and Landscape Architecture, Colorado State University, Fort Collins, CO 80523-1173

Search for other papers by Michael J. Roll in
ASHS
Google Scholar
PubMed
Close
, and
Robert O. MillerLand, Air, and Water Resources, University of California, Davis, CA 95616-8627

Search for other papers by Robert O. Miller in
ASHS
Google Scholar
PubMed
Close

Two cultivars of zonal geraniums (Pelargonium ×hortorum Bailey), `Danielle' and `Kim', were grown in media containing three grind sizes of rubber (2.4, 6, or 10 mm) and fiber from the fabric belting processed from waste tires in three proportions: 1 rubber or fiber: 1 peat; 1 rubber or fiber: 1 vermiculite: 2 peat; and 2 rubber or fiber: 1 vermiculite: 1 peat (by volume). Two control media were also included: 1 vermiculite: 1 peat, and 1 rockwool: 1 peat (by volume). Geranium plants were grown in media containing up to 25% waste tire products along with traditional medium components without reducing plant quality. Plant growth was best and flower count was highest in the vermiculite and peat medium, plants were smallest and flower count was lowest in media containing the rubber grinds at 2.4 or 6 mm, making up 50% of the media. The medium 1 rubber: 1 vermiculite: 2 peat, regardless of grind or fiber, produced plants equal to the rockwool and peat moss medium. All plants grown in media containing rubber by-products had elevated Zn and Cu in the foliage; however, Zn and Cu were highest in media containing 50% rubber. Foliar P: Zn ratios were less for plants grown in media containing 50% rubber and also were lower in plants grown in media with smaller rubber grind sizes.

  • Collapse
  • Expand