Rapid growth and high yield suggest that Populus hybrids are good trees to be used in a short-rotation wood fiber production system. Of the three clones tested on an Edom silt loam soil, done NE-388 appeared to be the best for rotations of at least 4 years. At densities ranging from 0.09 to 0.46 m² per tree, 4-year-old trees of clone NE-388 were taller, larger in diameter, and accumulated more fiber than either done NE-49 or NE-252 trees. Forest Sci. 22:449-454.