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Soil properties were related to height growth of three small plantations on a second terrace in East Texas: 1.5 acres of 5 year-old sycamore (Hutanus occidentalis L.), 1.5 acres of (i-year-old sweetgum (Liquidumbar styrucijhu L.), and 3.0 acres of 6-year-old green ash (Fruxinus pennsylvunicu Marx.). Five soil sample pits in each stand represented variation in height classes. Stepwise regression analysis was used to determine significant height growth predictors. Height of the sycamores ranged from 3.1 to 16.4 feet. Height at age 5 was negatively correlated with percent clay at a depth of 1.0 foot and positively correlated with pH at 0.5 foot. Clay slowed drainage on this generally low, wet site, while pH of the best sites favored optimum nutrient availability. Sweetgum heights ranged from 3.2 to 15.5 feet. Height at age 6 increased with increasing fine material at a depth of 2.5 feet, which improved moisture retention on this high, welldrained plantation. Green ash heights ranged from 4.5 to 18.1 feet. Height at age 6 increased directly with pH of the Al horizon and decreased with increasing potassium in the Al. The pH levels of the better sites favored optimum nutrient availability, but the effect of potassium could only be explained as sample variation.


Willett, R. L., and Bilan, M. V. 1993. RELATION OF SOME PHYSICAL AND CHEMICAL SOIL PROPERTIES TO THE GROWTH. Proceedings Mobile, Alabama November 17-19, 1992. Proceedings of the Seventh Biennial Southern Silvicultural Research Conference. Gen. Tech. Rep. SO-93. New Orleans, LA: U.S. Dept of Agriculture, Forest Service, Southern Forest Experiment Station. 665 p.



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