Brown, K.M.; Miller, C.R.; Kuhns, L.; Beattie, D.J.; Lynch, J.P.


Journal of Environmental Horticulture, Horticultural Research Institute, Volume 17, Issue 4, USA, p.153-157 (1999)

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The effects of Al-P fertilizer on the growth rhododendron ( Rhododendron catawbiense cv. English Roseum) and forsythia ( Forsythia intermedia cv. Spring Glory) were investigated in 2 sites, Rock Springs and Potters Mills, Pennsylvania, USA. The fertilizer treatments were Al-P at 0.5 or 1%, Osmocote and Soluble P, while the nutrient sources were Osmocote (36-0-0, 0-0-44 and 17-6-10), Micromax Plus (0-4-0) and Al-P. Every 2 weeks, the leachate was collected from 1 pot per block. Rhododendron plants grown in Al-P produced more dry matter and higher volume than that with Osmocote. Rhododendron plants grew more with 0.5 than 1% Al-P. At both sites, plants supplied with Osmocote were the smallest. Forsythia plants had higher dry matter accumulation with 0.5% Al-P than with the other fertilizer treatments. Results suggested that Osmocote failed to provide optimum nutrition and Al-P releases P in proportion to the P concentration in the medium.