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Effects of Nitrogen and Phosphorus Fertilization on Juvenile Growth of Planted Yellow Poplar on an Eroded Old Field¹

ABSTRACT

In a yellow poplar (Liriodendron tulipfera L.) plantation, three levels of nitrogen (0, 336, 672 kg/ha) and phosphorus (0, 168, 336 kg/ha) fertilizer applied at planting were tested in factorially arranged experiment with a split plot design. Nitrogen fertilizer was applied in holes near trees by two methods: loose and in perforated plastic bags.

Survival after 5 years was 56% and was not influenced by treatment. Both nitrogen and phosphorus stimulated growth during the first 2 years after planting but phosphorus was effective only when combined with nitrogen fertilization. During this period, loose application of nitrogen fertilizer gave better results than bagged application. After 5 years, only nitrogen effects were statistically significant; mean height (2.59 m) of trees in the most effective nitrogen treatment (672 kg/ha) was 80% greater than controls.

¹ Contribution from the Tennessee Valley Authority, Norris, Tenn., and the Oak Ridge National Lab., Oak Ridge, Tenn.

² The authors are, respectively, Plant Physiologist, Forestry and Fisheries Laboratory, TVA Division of Forestry Development, Norris, Tenn.; Staff Forester, TVA Division of Forestry Development, Norris, Tenn.; and Ecologist, Radiation Ecology Section, Oak Ridge National Laboratory, Oak Ridge, Tenn. They are indebted to Sara Potts and Ruth Moore for statistical analyses.

Received for publication August 22, 1969. Accepted for publication October 7, 1969.