Response of Coniferous Seedlings to Soil Applications of Calcium and Magnesium Fertilizers1
- G. K. Voigt,
- J. H. Stoeckeler and
- S. A. Wilde2
Coniferous seedlings and transplants growing in two nurseries located on coarse sandy soils in northern Wisconsin showed intense yellowing of the outer portions of needles or, in severe cases, the entire foliage. This condition was accompanied by a greatly reduced rate of growth. Greenhouse and sample plot trials revealed that the yellowing was caused by acute deficiency of both calcium and magnesium in available or exchangeable form. The results of soil and foliar analyses suggested antagonistic interrelationships between calcium and magnesium and potassium. The normal color and rate of growth of seedlings were restored by application of 1 ton per acre of dolomitic limestone. A similar effect was produced by rototilling a 6-inch topdressing of leaf mold from a productive hardwood-coniferous stand.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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