About Us | Help Videos | Contact Us | Subscriptions



This article in JEQ

  1. Vol. 32 No. 3, p. 1072-1081
    Received: June 4, 2002

    * Corresponding author(s): pjk9@psu.edu
Request Permissions


Effect of Broadcast Manure on Runoff Phosphorus Concentrations over Successive Rainfall Events

  1. Peter J. A. Kleinman * and
  2. Andrew N. Sharpley
  1. USDA-ARS, Pasture Systems and Watershed Management Research Unit, University Park, PA 16802-3702


Concern over eutrophication has directed attention to manure management effects on phosphorus (P) loss in runoff. This study evaluates the effects of manure application rate and type on runoff P concentrations from two, acidic agricultural soils over successive runoff events. Soils were packed into 100- × 20- × 5-cm runoff boxes and broadcast with three manures (dairy, Bos taurus; layer poultry, Gallus gallus; swine, Sus scrofa) at six rates, from 0 to 150 kg total phosphorus (TP) ha−1 Simulated rainfall (70 mm h−1) was applied until 30 min of runoff was collected 3, 10, and 24 d after manure application. Application rate was related to runoff P (r 2 = 0.50–0.98), due to increased concentrations of dissolved reactive phosphorus (DRP) in runoff; as application rate increased, so did the contribution of DRP to runoff TP. Varied concentrations of water-extractable phosphorus (WEP) in manures (2–8 g WEP kg−1) resulted in significantly lower DRP concentrations in runoff from dairy manure treatments (0.4–2.2 mg DRP L−1) than from poultry (0.3–32.5 mg DRP L−1) and swine manure treatments (0.3–22.7 mg DRP L−1). Differences in runoff DRP concentrations related to manure type and application rate were diminished by repeated rainfall events, probably as a result of manure P translocation into the soil and removal of applied P by runoff. Differential erosion of broadcast manure caused significant differences in runoff TP concentrations between soils. Results highlight the important, but transient, role of soluble P in manure on runoff P, and point to the interactive effects of management and soils on runoff P losses.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © 2003. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyPublished in J. Environ. Qual.32:1072–1081.