Abstract
Nine-year-old Japanese black pines, experimentally grown in Howard County, Maryland, from four different seed lots, ranged in average height from 6.6 feet to 8.1 feet; Scotch pines in the same plantation from three seed lots ranged from 5.8 feet to 7.8 feet. Analysis of variance showed no significant differences between the heights of these seven progenies. Therefore, it was concluded that Japanese black pines and Scotch pines in this test demonstrated similar growth rates.
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