Rhododendrons samples were collected from different cultivars and nurseries then tested for calcium and magnesium content. The rhododendrons involved in the study were were given ratings based on leaf quality, plant quality, and flower bud formation.
To view the article, click on the link attachment.
Aug.-Sept. 1978 Vol. 2, Issue 4 Page 7
R.L. Ticknor Professor of Horticulture Oregon State University, Aurora, OR