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Urea and Ammonium Nitrate as Nitrogen Sources for Southern Pine Plantations

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Urea and ammonium nitrate, applied in February, June, and October, were compared as nitrogen fertilizer sources in 11 southern pine plantations ranging in age from 6 to 18 years old. Over a 4-year assessment period all but one of the plantations responded significantly to nitrogen fertilization. Differences between urea and ammonium nitrate were nonsignificant at all sites for all three dates of application. Average responses for February and October applications were quantitatively very similar at each site. However, at 3 of the 11 sites June applications of both urea and ammonium nitrate gave significantly poorer responses than February and October applications.
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Document Type: Journal Article

Affiliations: Manager, Forest Management Research, Weyerhaeuser Company, Centralia, Washington

Publication date: 1981-08-01

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