Bulletin of the National Research Council 1(4): 279 (1920)

North American Forest Research

410. Experimental nursery practice with exotic and native species.

The use of charcoal braize as a soil amendment to bring the stiff clay soil to favorable physical condition has probably passed the experimental stage in the Mont Alto Nursery; yet some studies are still advisable to determine the optimum application. Norway spruce begins to suffer already in some parts of the nursery where charcoal has been most heavily used, showing that the soil is too dark and warm for this species.