Long term availability of applied phosphorus to loblolly pine pinus taeda on a piedmont soil

Torbert, J.L.Jr; Burger, J.A.

Soil Science Society of America Journal 48(5): 1174-1178


ISSN/ISBN: 0361-5995
Accession: 005827638

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A loblolly pine P fertilization trial was evaluated 20 yr after establishment on a Tatum silt loam (clayey, mixed, thermic, Typic Hapludults), in the Virginia Piedmont [USA]. Triple superphosphate (TSP) was applied at 160 kg P/ha and ground rock phosphate (GRP) at both 160 kg P/ha and 670 kg P/ha. Lime was applied (4.48 Mg/ha) with and without TSP. Tree growth was not significantly affected by treatment and foliar P levels were > 0.10% on control plots, indicating that a deficiency was not the immediate growth-limiting factor. Soil and foliar P levels were highest where GRP was applied at 670 kg P/ha. Foliar P levels and double acid (0.05 M HCl + 0.0125 M H2SO4) extractable soil P were highest when 160 kg P/ha was applied as GRP vs. TSP. Liming caused a pH increase which persisted even after 20 yr but had no direct effect on P availability.