My Account: Log In | Join | Renew
Search
Author
Title
Vol.
Issue
Year
1st Page

Abstract

 

This article in JEQ

  1. Vol. 36 No. 1, p. 175-183
     
    Received: Jan 19, 2006
    Published: Jan, 2007


    * Corresponding author(s): krw@ifas.ufl.edu
 View
 Download
 Alerts
 Permissions
 Share

doi:10.2134/jeq2006.0025

Five Year-Round Forage Systems in a Dairy Effluent Sprayfield

  1. Kenneth R. Woodard *a,
  2. Lynn E. Sollenbergera,
  3. Lewin A. Sweata,
  4. Donald A. Graetzb,
  5. Stuart J. Rympha and
  6. Yongsung Jooc
  1. a Agronomy Dep., Univ. of Florida, Gainesville
    b Soil and Water Sci. Dep., Univ. of Florida, Gainesville
    c College of Medicine, Univ. of Florida, Gainesville

Abstract

In northern Florida, forages are grown in dairy effluent sprayfields to recover excess P. Our purpose was to evaluate five year-round forage systems for their capacity to remove P from a dairy sprayfield. The soil is a Kershaw sand (thermic, uncoated Typic Quartzipsamment). Systems included bermudagrass (Cynodon spp.)-rye (Secale cereale L.) (BR), perennial peanut (Arachis glabrata Benth.)-rye (PR), corn (Zea mays L.)-forage sorghum [Sorghum bicolor (L.) Moench]-rye (CSR), corn-bermudagrass-rye (CBR), and corn-perennial peanut-rye (CPR). Forages were grown for five 12-mo cycles. Effluent P rates were 80, 120, and 165 kg ha−1 cycle−1 The 5-cycle P removal was 67 kg ha−1 cycle−1 for BR, 54 kg ha−1 for CBR, 52 kg for CSR, 45 kg for PR, and 43 for CPR. Removal of P by winter rye was low. There were differences in system rankings among cycles primarily due to changes in the performance of perennial forages. In the first two cycles, BR had the greatest P removal (91 kg ha−1 cycle−1) due to high bermudagrass yield and P concentration. In the first cycle, P removal was lowest for PR (36 kg ha−1) because perennial peanut was slow to establish. In later cycles, P removal for BR declined because bermudagrass yield and P concentration declined. It increased for PR because peanut yield increased. The yield of corn in CBR, CPR, and CSR was consistently high but P concentration was modest (avg. 2.2 g kg−1). Sorghum produced moderate but stable yield and had low P levels (avg. 1.8 g kg−1). Effluent rate marginally affected the performance of most grasses. For P recovery in dairy sprayfields in northern Florida, the best warm-season forage would likely be a high yielding, persistent bermudagrass.

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

Copyright © 2007. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyASA, CSSA, SSSA