Document Type

Thesis - Open Access

Award Date

2015

Degree Name

Master of Science (MS)

Department / School

Agronomy, Horticulture, and Plant Science

First Advisor

Sharon Clay

Abstract

The continuous use of glyphosate-resistant crops has resulted in volunteer crops with the same herbicide resistance as the cash crop and an increasing weed problem. Volunteer corn reduces soybean yields however; little research has examined corn yield loss due to volunteer corn or volunteer soybean competition. These studies investigated yield loss and control of volunteer soybean in corn, and volunteer corn in soybean and corn. Using several densities of competitive plants, the yield loss was fit to a hyperbolic equation that indicated incremental yield loss (I value) to be 29.9 for volunteer corn in soybeans, 5.6 for volunteer corn in corn, and 3.2 for volunteer soybeans in corn. These data indicate that yield loss due to volunteer corn in soybean was six times greater than yield loss due to volunteer corn in corn and about ten times greater than yield loss due to volunteer soybean in corn. Reduced rates of clethodim resulted in partial control of volunteer corn in soybeans. Soybean yield loss was observed with 12.7 or 25.5 g a.i. ha-1 clethodim however, 51 g a.i. ha-1 clethodim showed minimal soybean yield loss. Glufosinate with a reduced rate of graminicide proved to be an option for excellent (>90%) to good (>80%

Library of Congress Subject Headings

Herbicide-resistant crops
Glyphosate
Corn--Weed control
Soybean--Weed control

Description

Includes bibliographical references (pages 70-75)

Format

application/pdf

Number of Pages

84

Publisher

South Dakota State University

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Rights Statement

In Copyright