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Optimum Nitrogen Rates for Fertilization of Loblolly Pine Plantations

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Biologic and economic optimum rates of nitrogen (N) fertilization were estimated 4 or 5 years after fertilization for 11 loblolly pine plantations which were responsive to ammonium nitrate fertilization. Despite the diversity of sites and stands examined, variation in the optimum N rates was not very great. The biologic optimum averaged 200 lbs. N per acre, while the economic optimum varied according to the value of the harvested product: for wood values at $0.70 and $0.20 per cu. ft. the average economic optima were 152 and 57 lbs. N per acre, respectively. These two economic rates captured, on average, 94 percent and 52 percent, respectively, of the maximum biologic response. The response magnitude showed considerably more variation between sites than the optimum N rates, with the maximum biologic volume response ranging from 193 to 502 cu. ft. per acre over a 5-year period.
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Document Type: Journal Article

Affiliations: Western Forest Research Center, Weyerhaeuser Company, Centralia, Washington

Publication date: 1981-11-01

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