Mycorrhizal deficiency in a Douglas-fir region nursery


James M. Trappe and Robert F. Strand
Forest Science, 15: 381-389. 1969.

This paper demonstrates the effects of mycorrhiza deficiency on Douglas-fir seedling growth. 
It is available for download in PDF (1.6MB) or .doc (6.7MB) format.

There is also a galery of supplemental color images available here.