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This article in SSSAJ

  1. Vol. 34 No. 2, p. 312-313
    Received: Aug 22, 1969
    Accepted: Oct 7, 1969

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

  1. R. E. Farmer Jr.,
  2. E. A. Snow and
  3. J. W. Curlin2



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.

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