About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in AJ

  1. Vol. 90 No. 3, p. 399-404
     
    Received: Jan 6, 1997
    Published: May, 1998


    * Corresponding author(s): Clinton.Shock@orst.edu
 View
 Download
 Alerts
 Permissions
 Share

doi:10.2134/agronj1998.00021962009000030014x

Reducing DCPA Losses in Furrow Irrigation by Herbicide Banding and Straw Mulching

  1. Clinton C. Shock ,
  2. Majid Seddigh,
  3. Joe H. Hobson,
  4. Ian J. Tinsley,
  5. Byron M. Shock and
  6. Lucia R. Durand
  1. M alheur Exp. Stn., Oregon State Univ., Univ., 595 Onion Ave., Ontario, OR 97914
    1  Jefferson Pkwy., #298, Lake Oswego, OR 97035
    P .O. Box 2150, Keizer, OR 97307
    D ep. of Agric. Chem., Oregon State Univ., Corvallis, OR 97331
    D ep. of Cognitive and Neural Systems, Boston University, 677 Beacon St., Rm. 201, Boston, MA 02215

Abstract

Abstract

There are concerns about residues of DCPA (dimethyl 2,3,5,6-tetrachloro-1,4-benzenedicarboxylate) and its two acid metabolites in surface runoff from furrow-irrigated croplands. We studied the effects of mulching irrigation furrows with wheat (Trilicum aestivum L.) straw on DCPA movement in runoff solution, with sediment, and in the soil profile. The study site had a Nyssa silt loam (coarse-silty, mixed, mesic Xerollic Haplodurid) with a 3% slope. The field was planted to onion (Allium cepa L.) and was furrow-irrigated 17 times. Prior to mulching, DCPA was either broadcast at 10 kg a.i. ha−1 or banded at 3.4 kg a.i. ha−1 on the top of beds between furrows. DCPA (parent plus metabolites) was measured in the runoff sediment of the first 6 irrigations, and in the runoff solution of the 1st, 3rd, and the 5th irrigation. Regardless of herbicide application method, mulching reduced DCPA losses in sediment of all irrigations and in the runoff solution of the fifth irrigation. Averaged across the 6 irrigations and the 2 herbicide application methods, mulching reduced DCPA transfer in sediment by about 90%. Straw mulch effects on DCPA losses were primarily through reductions in soil loss and runoff volume, whereasDCPA concentration was not affected in runoff solution and was increased in runoff sediment of some irrigations. Mulching increased infiltration of broadcast DCPA but tended to decrease infiltration of banded DCPA. Also, compared with broadcast DCPA, banding the herbicide reduced DCPA losses in sediment of some irrigations. We concluded that the combination of straw mulching and banding DCPA reduces herbicide transfer in surface runoff and movement into thesoil profile.

Contribution from Oregon Agric. Exp. Stn., Tech. Paper no. 10592

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

Copyright © .