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Response of Seed of 10 Weed Species to Fresnel-lens-concentrated Solar Radiation

Published online by Cambridge University Press:  12 June 2017

David W. Johnson ,
James M. Krall ,
Ronald H. Delaney  and
David S. Thiel
David W. Johnson
Affiliation:
Plant, Soil and Insect Sci. Dep., Univ. Wyo. Laramie, WY 82071
James M. Krall
Affiliation:
Plant, Soil and Insect Sci. Dep., Univ. Wyo. Laramie, WY 82071
Ronald H. Delaney
Affiliation:
Plant, Soil and Insect Sci. Dep., Univ. Wyo. Laramie, WY 82071
David S. Thiel
Affiliation:
Plant, Soil and Insect Sci. Dep., Univ. Wyo. Laramie, WY 82071
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Abstract

A curved-linear Fresnel lens was investigated to test the effect of concentrated solar radiation on surface and buried weed seed. The lens produced a line focus 1 by 150 cm with a mean temperature of 309 C. A 20-s exposure to seed on the soil surface was 100% lethal to green foxtail, kochia, common lambsquarters, common purslane, and wild buckwheat. In a separate study, emergence from kochia and yellow foxtail seed was reduced 100% at 10 mm soil depth after 15 min in soil of 35 and 93 g/kg moisture and 20 to 40% at 178 g/kg moisture content. Concentrated solar radiation from a Fresnel lens has the greatest potential for affecting weed seed on the soil surface. A series of Fresnel lenses and/or larger lenses may be required for many practical field applications.

Keywords

Green foxtail, Setaria viridis (L.)Beauv. ♯3 SETVIkochia, Kochia scoparia (L.)Schrad. ♯ KCHSCcommon lambsquarters, Chenopodium album L. ♯ CHEALcommon purslane, Portulaca oleracea L. ♯ POROLwild buckwheat, Polygonum convolvulus L. ♯ POLCOyellow foxtail, Setaria glauca (L.)Beauv. ♯ SETLUGerminationtemperature responseemergencecurved linear lensSETVIKCHSCCHEALPOROLPOLCOAMAREPANMIBROTESETLUAVEFA
Type
Research
Information
Weed Technology , Volume 4 , Issue 1 , March 1990 , pp. 109 - 114
Copyright
Copyright © 1990 Weed Science Society of America 

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References

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