Previous observations of the establishment of yellow birch have cited the importance of mixed humus-mineral soil seedbeds. Godman and Krefting pointed out that both germination and growth were enhanced. Subsequent studies have shown that while germination in the absence of competition is adequate on mineral soil of a Podzol A under a wide variety of light and moisture conditions, growth is uniformly poor. On humus, good growth was obtained but adequate germination occurred only in part of the environments tested. This Note reports the growth response of yellow birch seedlings grown on various mixtures of mineral soil and humus.
Tubbs, Carl H.; Oberg, Robert R. 1966. Growth Response of Seedling Yellow Birch to Humus-Soil Mixtures. Research Note NC-6, St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station