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Phytotoxicity of Bensulide and Trifluralin in Several Soils

Published online by Cambridge University Press:  12 June 2017

R. M. Menges  and
J. L. Hubbard
R. M. Menges
Affiliation:
Crops Research Division, Agr. Res. Serv., U. S. Dep. of Agr.
J. L. Hubbard
Affiliation:
Texas Agr. Exp. Sta., Texas A&M University, Weslaco, Texas
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Abstract

Seedlings of 19 plant species were grown in soils containing 0 to 1,000 ppm of O,O-diisopropyl phosphorodithioate S-ester with N-(2-mercaptoethyl)benzenesulfonamide (bensulide) or 0 to 100 ppm of a,a,a-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine (trifluralin) to determine phytotoxicity. Standard growth curves were constructed. The concentration of bensulide required to reduce the growth of shoots 50% (GR50) ranged from 1 ppm with barnyardgrass (Echinochloa crusgalli (L.) Beauv.) to more than 1,000 ppm with carrot (Daucus carota L., var. Long Imperator). Several plant species were more sensitive to bensulide in a Hidalgo sandy loam (pH 8.1) than in other soils including a Delfina loamy fine sand (pH 6.0). The concentration of trifluralin required to reduce the growth of shoots 50% (GR50) was not markedly affected by soil texture and ranged from 0.1 ppm with German millet (Setaria italica (L.) Beauv.) to more than 100 ppm with Long Imperator carrot. The standard growth curves have been used to quantify herbicidal activities in field soils.

Type
Research Article
Information
Weed Science , Volume 18 , Issue 2 , March 1970 , pp. 244 - 247
Copyright
Copyright © 1970 Weed Science Society of America 

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References

Literature Cited

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