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This article in CM

  1. Vol. 10 No. 1
     
    Accepted: Apr 18, 2011


    * Corresponding author(s): jholman@ksu.edu
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doi:10.1094/CM-2011-0629-01-RS

Volunteer Glyphosate-Tolerant Corn Reduces Soil Water Storage and Winter Wheat Yields

  1. Johnathon D. Holman *a,
  2. Alan J. Schlegelb,
  3. Brian L. Olsonc and
  4. Scott R. Maxwelld
  1. a Department of Agronomy, Southwest Research Extension Center, Kansas State University, Garden City, KS 67846
    b Southwest Research Extension Center, Kansas State University, Tribune, KS 67879
    c Northwest Research Extension Center, Kansas State University, Colby, KS 67701; and
    d Southwest Research Extension Center, Kansas State University, Garden City, KS 67846

Abstract

A common crop rotation in the west-central Great Plains is no-till winter wheat-corn-fallow. Because most of the corn produced is herbicide-tolerant, volunteer corn in fallow is not controlled with glyphosate. This study evaluated the impact of volunteer corn on soil moisture storage in fallow and the succeeding winter wheat crop across three locations in western Kansas from 2008 to 2010. Volunteer corn reduced available soil water at wheat planting in 8 out of 9 site years. On average, available soil water was reduced by 1 inch for each 2,500 volunteer corn plants per acre. Volunteer corn water use reduced wheat tillers in half of the site years. Similarly, volunteer corn reduced wheat yields in half of the site years, and yields fell 1 bu/acre for every 500 volunteer corn plants per acre. When wheat yields were above 70 bu/acre or below 35 bu/acre, other factors affected wheat yield more than the preceding volunteer corn population or available soil water at wheat planting.

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