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  • Author or Editor: Kenneth M. Tilt x
  • Journal of the American Society for Horticultural Science x
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Composted hardwood bark and aged pine bark were combined to produce two media with different particle size fractions. Media were combined with 3.8-, 5.7-, and 11.4-liter containers to produce six air and water capacities. Rooted cuttings of Ilex × ‘Nellie R. Stevens’ Van Lennep holly, × Cupressocyparis leylandii Jacks and Dall. ‘Ηaggerston Grey’ leyland cypress and Rhododendron × sp. ‘Sunglow’ azalea were potted in the resulting media–container combinations to determine the effects of particle size distribution, moisture and air content, and volume of containers on plant growth. Manipulating the particle size decreased the water held by ≈9%, but increased air space by ≈8% between the control and the coarse medium. The control medium yielded greatest top dry weight for all three species. Root dry weight and root ball volume were similar in coarse and control medium. Plant growth also was related to container size. A 2-fold increase in top dry weight occurred as container volume of the medium increased from 3.8 to 11.4 liters. Increasing container water content had a significant effect on top dry weight of all three species. Aeration was not as limiting to root growth as water content was to top growth.

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