Leaching Potential with Diammonium Phosphate and Pou try Litter Fertilization of Young Pine Plantations in the Florida Sandhills

Minogue, Patrick J.; Osiecka, Anna; Mackowiak, Cheryl L.; Nowak, Jarek
November 2012
Southern Journal of Applied Forestry;Nov2012, Vol. 36 Issue 4, p181
Academic Journal
Nutrient use and leaching potential using diammonium phosphate (DAP) or poultry litter fertilizers in 2-year-old plantations of slash pine (Pinus elliottii Engelm.), loblolly pine [Pinus toeda L), and longleaf pine [Pinus palustris Mill.) were examined for 3 years at a study location having sandy, excessively drained soils and high leaching potential. Fertilization with litter resulted in greater height and diameter growth than the unfertilized control in loblolly pine, but not for the other species. Measures of soil matrix nitrate + nitrite nitrogen (N0X-N) concentration at various depths in stands of the three species and in soil solution from lysimeter extracts in slash pine stands indicated significant leaching from litter or DAP. Litter fertilization elevated NH4-N concentrations in soil solution at a 30-cm depth when measured at 3 and 6 weeks öfter fertilization, whereas soil matrix NH4-N was unchanged. Following litter fertilization, soil matrix P, Ca, and Mg concentrations in the uppermost 15 cm were significantly greater than the control. Fertilization with litter increased soil K, and it was detected at the 120-cm depth by 4 months. Groundwater N0X-N concentrations in wells monitoring the fertilized area were at maximum 2.7 mg L-1 greater than a distant background well.


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