Douglas-fir seedlings were planted in 1963 near Burnt Woods, Oregon, on land covered with grass, salal, or bracken to test the effects of terracing on regeneration. After 9 years, survival was best (about 95 percent) among seedlings machine-planted along the centers of the terraces and was better on south than on north slopes, although height of surviving seedlings was greater on north slopes. About half of the trees planted in the rough between terraces died, and the survivors attained only about one-half the height of trees planted by machine in the terrace centers. Planting in terraces should succeed on deep soil with slopes between 20 and 50 percent. Outward-sloping terraces are recommended to lessen soil disturbance, prevent ponding, and avoid need for water bars.
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