Nitrogen Content of Helleri Holly as Influenced by Ambient Temperature and Nitrogen Fertilization Rate
Rooted cuttings of Ilex crenata Thunb. ‘Helleri’ were grown at 3 day/night temperature regimes 18°/14°, 14°/10° and 10°/6°C (64°/57°, 57°/50° and 50°/43°F) and 3 N rates, 10, 20, 80 ppm in a factorial arrangement. Total plant N increased over time at progressively higher rates as both temperature and N rate increased. Nitrogen rate had a greater influence on N accumulation than temperature and based upon the increase in percent N at the various N rates, a recommendation for timing fall fertilizer application is made.
Contributor Notes
2Associate Professors. The authors wish to express appreciation to Dr. R.J. Downs and Mr. C.M. Farrell of the Southeastern Plant Environment Laboratory for technical assistance. This work was supported in part by the Virginia Nurserymen's Association.