Shredded Waste Tires as a Growing Media Amendment for Production of Flowering Vinca

in HortScience
Authors:
Karen L. PanterColorado State Univ. Cooperative Extension, 9755 Henderson Road, Brighton, CO 80601, and Dept. of Horticulture and Landscape Architecture, Colorado State Univ., Fort Collins, CO 80523

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Steven E. NewmanColorado State Univ. Cooperative Extension, 9755 Henderson Road, Brighton, CO 80601, and Dept. of Horticulture and Landscape Architecture, Colorado State Univ., Fort Collins, CO 80523

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Michael J. RollColorado State Univ. Cooperative Extension, 9755 Henderson Road, Brighton, CO 80601, and Dept. of Horticulture and Landscape Architecture, Colorado State Univ., Fort Collins, CO 80523

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Catharanthus roseus plants were grown in three media, each containing one of two by-products of shredded waste tires. The media were no. 1) 1 rubber*: 1 peat moss, no. 2) 1 rubber*: 1 vermiculite: 2 peat moss, and no. 3) 2 rubber*: 1 vermiculite: 1 peat moss (by volume) where rubber* indicates either 0.6 cm shredded rubber or a fibrous by-product. Control plants were grown in 1 peatmoss: 1 rockwool and 1 vermiculite: 1 peatmoss (by volume). Catharanthus roseus cv. Peppermint Cooler plants were grown for 7 weeks in 10-cm containers at a commercial Denver-area greenhouse. Data taken included plant heights, plant widths, flowers per stem, and dry weights. Visually, plants grown in the no. 2 mix, with either fiber or 0.6-cm rubber, were similar to the controls and superior to the other two mixes. Ending plant heights were similar among the two controls and no. 2 with fiber and were taller than all other combinations. Flower numbers were greater in the 1 rockwool: 1 peat moss control and no. 2 mix with fiber than any other treatment. The same was true for stem number and dry weight. Results indicate that the no. 2 mix of 1 fiber: 1 vermiculite: 2 peatmoss has potential for container crop production.

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