Native Plants Journal - Article

Influence of irrigation method and container type on northern red oak seedling growth and media electrical conduction

Abstract:

Container production of hardwood seedlings has not been extensively practiced. Efficient nursery production of hardwood seedlings in containers can be limited by formation of a broad foliar canopy, which limits irrigation uniformity. This study was established to investigate suitability of subirrigation, a method of irrigating seedlings from the container base that relies on rise of water through capillary action, for production of broad-leaved hardwood seedlings. Northern red oak (Quercus rubra L. [Fagaceae]) seeds were sown into 4 container types, and seedlings were grown in a controlled greenhouse environment under either traditional overhead irrigation or subirrigation. Media electrical conductivity (EC) was measured at container depths of 1, 5, and 10 cm (0.4, 2, and 4 in) after 57 d. Subirrigated seedlings had significantly higher EC at each depth compared with overhead irrigated seedlings, with a trend of decreasing EC with increasing measurement depth. A significant container type x irrigation method interaction suggested potential for toxic EC levels in some subirrigated containers, which can be alleviated by periodic leaching using clear water to dissipate salts from the top 1 cm (0.4 in). At the end of the growing period, seedling height and root-collar diameter were not influenced by irrigation method or container type, indicating that subirrigation is suitable for hardwood seedling production.

Issue & Pages:

Spring 2008 Pages: 4-14

Article Download:

7-3NPJ315-323.pdf (PDF document)

Authors:

• Anthony S Davis
• Douglass F Jacobs
• Ronald P Overton
• R Kasten Dumroese

Keywords:

container propagation, ebb-and-flow, hardwood seedlings, flood irrigation, seedling quality, subirrigation