Soil reaction and germination of Douglas-fir seed.

Abstract

Wood ash and its accompanying alkalinity have sometimes been cited as being harmful to germination of tree seed on slash-burned forest land. Unasylva, the United Nations forestry publication, recently carried a report of research in British Columbia on the effect of slash burning on germination and initial survival of lodgepole pine and Douglas-fir. One finding was that "There was no germination where ash was added to unburned soil, due to the increased pH of the soil, the hardening of the ash layer, and exclusion of oxygen and high concentration of the nutrient solution

Citation

Tarrant, Robert F. 1954. Soil reaction and germination of Douglas-fir seed. PNW Old Series Research Notes No. 105, p. 1-4