In an experiment in which the water-table in peat was maintained at levels ranging from 0 to 34 cm, the height growth of Lodgepole pine was linearly related both to depth of water-table and to air volume in the surface horizons. Stem volume, tree weight, and foliage area, however, increased exponentially in response to drying of the peat. Foliar nitrogen and phosphorus levels were broadly related to treatment but, together with potassium levels, declined with time and showed no improvement as a result of the drying and increase in rooting volume that followed canopy closure.