Forests 2012, 3(4), 1071-1085; doi:10.3390/f3041071
Article

Phosphorus Fertilizer Rate, Soil P Availability, and Long-Term Growth Response in a Loblolly Pine Plantation on a Weathered Ultisol

1 Southern Research Station, USDA Forest Service, P.O. Box 1927, Normal, AL 35762, USA 2 North Florida Research and Education Center, University of Florida, 155 Research Road Quincy, FL 32351, USA
* Author to whom correspondence should be addressed.
Received: 29 August 2012; in revised form: 7 November 2012 / Accepted: 14 November 2012 / Published: 22 November 2012
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Abstract: Phosphorus is widely deficient throughout the southern pine region of the United States. Growth responses to P fertilization are generally long-lasting in a wide range of soil types, but little is known about fertilization rates and long-term P cycling and availability. In 1982, exceptionally high P fertilization rates (0, 81, 162, and 324 kg P ha1) were applied to a loamy Ultisol in central Louisiana, USA. We measured vegetation responses at age 27 years and sequentially extracted soil P to 1 m to elucidate potential P availability into the next rotation. Loblolly pine responded well to the lowest fertilization rate; total biomass was 39% greater in the fertilized plots compared to the unfertilized plots, but higher fertilization rates had no effect, presumably due to induced N-limitations. What little fertilizer P was found in the soils was in the moderately labile NaOH fraction in the surface 20 cm, and may be slowly available to the next pine rotation. Normal rates of P fertilizer will maintain elevated available P well into a second rotation in loamy Pleisteocene Ultisols of the western Gulf Coastal Plain. Exceptionally high rates were not effective at increasing potentially available P beyond normal rates.
Keywords: loblolly pine; phosphorus fertilization; phosphorus fractionation

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MDPI and ACS Style

Scott, D.A.; Bliss, C.M. Phosphorus Fertilizer Rate, Soil P Availability, and Long-Term Growth Response in a Loblolly Pine Plantation on a Weathered Ultisol. Forests 2012, 3, 1071-1085.

AMA Style

Scott DA, Bliss CM. Phosphorus Fertilizer Rate, Soil P Availability, and Long-Term Growth Response in a Loblolly Pine Plantation on a Weathered Ultisol. Forests. 2012; 3(4):1071-1085.

Chicago/Turabian Style

Scott, D. Andrew; Bliss, Christine M. 2012. "Phosphorus Fertilizer Rate, Soil P Availability, and Long-Term Growth Response in a Loblolly Pine Plantation on a Weathered Ultisol." Forests 3, no. 4: 1071-1085.

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