NITROGEN LEACHING FROM A UREA-FORMALDEHYDE AMENDED PINE BARK MEDIUM

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Authors:
Thomas YeagerEnvironmental Horticulture Department, IFAS, University of Florida, Gainesville, FL 32611.

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Ed GilmanEnvironmental Horticulture Department, IFAS, University of Florida, Gainesville, FL 32611.

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Diane WeigleEnvironmental Horticulture Department, IFAS, University of Florida, Gainesville, FL 32611.

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Claudia LarsenEnvironmental Horticulture Department, IFAS, University of Florida, Gainesville, FL 32611.

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Columns (4 × 15 cm) of a pine bark medium amended with the equivalent of 4.2 kg per cubic meter of dolomitic limestone and either 0, 2.4, 4.7, 7.1 or 9.5 mg of urea-formaldehyde (38% N) per cubic centimeter of medium were leached daily with 16 ml of deionized water (pH 5.5). Leachate total N, NO3--N and NH4+-N concentrations were determined on day 1, 3, 5, 7, 14, 28, 49, 91, 133, 203, 273 and 343. Leachate total N ranged from 600 ppm on day 1 for the 9.5 mg treatment to 4 ppm on day 273 for the 2.4 mg treatment. Leachate NH4+-N concentrations ranged from 38 ppm c4 day 3 for the 9.5 mg treatment to less than 1 ppm on day 7 for the 2.4 mg treatment and were less than total N concentrations at each sampling time. Leachate NO3--N was not detectable during the experimental period. Eleven, 16, 20 and 25% of the applied N leached from the columns amended with 2.4, 4.7, 7.1 or 9.5 mg of urea-formaldehyde per cubic centimeter of pine bark, respectively, during the 371 day experiment.

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