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This article in SSSAJ

  1. Vol. 46 No. 1, p. 133-136
    Received: Mar 26, 1981
    Accepted: Sept 10, 1981

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Slash Pine Growth Response to Different Nitrogen Fertilizers1

  1. R. F. Fisher and
  2. W. L. Pritchett2



Slash pine (Pinus elliottii var. elliottii Engelm.) were fertilized at time of planting with 22 and 88 kg N/ha in the form of urea, urea formaldehyde, sulfur-coated urea, ammonium sulfate, and sodium nitrate. Stands of small, pole-sized slash pine were fertilized with 55 and 220 kg N/ha in the form of urea, urea formaldehyde, ammonium sulfate, and ammonium nitrate. The stands were located on a spectrum of lower coastal plain soils. Soil solution nitrate and ammonium concentrations were monitored at 60-cm depths in the young stands. All treatments except urea formaldehyde caused NH4-N concentration to increase temporarily. Nitrate nitrogen concentration was temporarily increased by both urea and sodium nitrate treatments. After 6 and 10 years of growth, respectively, one-half of the stands in each age class had grown significantly better when nitrogen was added. No significant difference in the response to various nitrogen sources occurred.

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