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This article in JEQ

  1. Vol. 27 No. 3, p. 522-527
     
    Received: Feb 7, 1997


    * Corresponding author(s): vdna@gnv.ifas.ufl.edu
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doi:10.2134/jeq1998.00472425002700030007x

Dairy Manure Influences on Phosphorus Retention Capacity of Spodosols

  1. V. D. Nair *,
  2. D. A. Graetz and
  3. K. R. Reddy
  1. Soil and Water Science Dep., 106 Newell Hall, Box 110510, Univ. of Florida, Inst. of Food and Agric. Sciences, Gainesville, FL 32611.

Abstract

Abstract

Land areas used for dairy farming can result in accumulation of manure on soils that could produce nutrient-rich surface and subsurface runoff and cause accelerated lake eutrophication. This research was conducted on Spodosols that were differentially impacted by manure; the study included sites with different levels of total P (TP), from 2300 mg kg−1 in the soil highly impacted by intensive dairy farming to 18 mg kg−1 in an unimpacted area. The P retention characteristics of these soils were determined by using both single-point (1000 mg P kg−1 or 100 mg P L1) and traditional Langmuir isotherms. Phosphorus sorption values using a single high P solution had approximately a 1:1 relationship with values obtained for the maximum retention capacity, Smax, obtained from Langmuir isotherms (r2 = 0.98). The surface A and E horizons of manure-impacted soils had essentially no sorbing capacity while the Bh (spodic) and Bw horizons had mean Smax values 430 and 385 mg kg−1, respectively. The P sorbing capacity of the Bh and Bw horizons were attributed to high Al concentrations in these horizons. Higher P concentrations in the surface A horizon resulted in greater P concentrations in solutions equilibrated with the Bh- and Bw- horizon materials, which suggests a potential for vertical P movement through the soil profile. The spodic horizon of the less-impacted soils may not have been exposed to sufficiently high solution P concentrations to accumulate significant P in the soluble fraction.

Journal Series No. R-05593.

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