Document Type

Thesis - University Access Only

Award Date

1992

Degree Name

Master of Science (MS)

Department / School

Plant Science

Abstract

Foxtail (Setaria spp.) is one of the most abundant weeds in the Northern Great Plains area of the United states. Green foxtail (Setaria viridis) is the most prevalent weed in South Dakota, infesting an estimated 95% of all spring seeded small grain fields. Foxtail is known to compete directly with small grain for light, water and essential nutrients. Foxtail interference includes direct effects of competition, as well as indirect effects such as allelopathy or unknown factors which may provide an advantage to one specie over another. The effect of foxtail interference on yield, agronomic traits and quality of small grains varies considerably with environment and management factors. Identification of factors which affect foxtail and the impact of these factors would be beneficial. South Dakota ranks 5th in spring wheat (Triticum aestivum) production in the United States, producing 1,334,760 megagrams on South Dakota Understanding 7 o 8 , 7 5 o hectares in 19 91, as reported by the Agricultural Statistics Service ( 1991-1992) . the factors which contribute to foxtail interference may allow producers to adjust their agronomic practices to reduce the effect of foxtail competition. Adoption of these practices could have a substantial economic impact on the state.

The objectives of this study are:

1) to determine the effect of spring wheat cultivar phenotype on foxtail interference.

2) to identify the effect of foxtail density on yield, agronomic traits and quality of spring wheat,

3) to determine the effect of nitrogen fertility levels on foxtail interference.

4) to evaluate the effect of seeding date on foxtail interference.

5) to determine the effect of three herbicides applied at three rates and two timings on foxtail interference.

6) to identify the pattern and timing of foxtail emergence under field conditions.

Library of Congress Subject Headings

Foxtail -- South Dakota

Wheat -- Weed control -- South Dakota

Format

application/pdf

Number of Pages

95

Publisher

South Dakota State University

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