Abstract
Growth response and NPK concentrations of sprouts, current year's twigs and rhizomes of Kalmia angustifolia were determined in a factorial greenhouse experiment where N, P and K fertilizations were added on potted Kalmia. Growth of above and belowground components of Kalmia and the N, P and K concentrations of leaves were significantly altered due to treatments. Results are in contrast to the effect of fertilization on growth of other ericaceous shrubs. Involvement of special physiological processes, mycorrhizal relationships and open grown conditions were argued as probable causes for the observed better growth of Kalmia after fertilization. Enhanced growth of Kalmia contributes to its competitive ability and allelopathic interference, which play a significant role in its spread and interference to conifer regeneration.
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