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This article in SSSAJ

  1. Vol. 60 No. 5, p. 1454-1458
    Received: Dec 12, 1994

    * Corresponding author(s): aka@gnv.ifas.ufl.edu
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Leaching of Nitrogen from Slow-Release Urea Sources in Sandy Soils

  1. F. L. Wang and
  2. A. K. Alva 
  1. University of Saskatchewan, Dep. of Soil Science, Saskatoon, Saskatchewan, Canada, S7N 5A8
    Univ. of Florida, Inst. of Food and Agric. Sciences, Citrus Res. and Education Center, 700 Experiment Station Rd., Lake Alfred, FL 33850



Application of readily soluble forms of N fertilizers to sandy soils may cause leaching of NO3-N resulting in contamination of groundwater. The leaching loss of N may be reduced to some extent by using slow-release forms of N. An intermittent leaching and incubation technique, to mimic natural occurrence of rainfall and dry conditions, was used to examine the leaching of N from readily soluble (NH4NO3) and slow-release fertilizers [isobutylidene diurea (IBDU) and a polyolefin resin-coated urea, Meister] in Wabasso (sandy, siliceous, hyperthermic Alfic Haplaquod) and Candler (hyperthermic, uncoated Typic Quartzipsamment) soils. After 29 d, the cumulative recovery of the applied fertilizer N in the leachate for the treatments decreased in the following order: NH4NO3 (88-100%) > IBDU (27–32%) > Meister (11.5–11.7%). A significant portion (19.5–35.5%) of the total N leached from IBDU and Meister was in the urea form in the initial leaching; however, after 9 d, NO3 and NH4 forms represented the major portion of leachate total N. Although N from NH4NO3 was leached completely from the Candler sand, 12% of the applied N (as NH4NO3) was not recovered in the leachate from the Wabasso sand. Cumulative NH4-N leached from the Wabasso sand was only 58% of that from the Candler sand. The results demonstrate that the amounts and forms of fertilizer N leached from the sandy soils depend on the solubility of the fertilizer, the soil type, and the duration of intermittent leaching.

Contribution of the Citrus Res. and Education Center. Florida Agric. Exp. Stn. Journal Series no. R-04300.

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