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Nitralin and Trifluralin Persistence in Soil

Published online by Cambridge University Press:  12 June 2017

K. E. Savage
K. E. Savage*
Affiliation:
Southern Weed Sci. Lab., Plant Sci. Res. Div., Agr. Res. Serv., U.S. Dep. Agr., Stoneville, MS. 38776
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Abstract

Analysis of soil samples taken periodically from field plots on Dundee silty clay loam treated with single or dual annual applications of 4-(methylsulfonyl)-2,6-dinitro-N,N-dipropylaniline (nitralin) or α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine (trifluralin) at 0.84 or 1.68 kg/ha indicated dissipation of the herbicides to a low residual level within 3 to 4 months following each application. No accumulation was noted with either herbicide regardless of frequency or rate of application. Nitralin phytotoxicity to sorghum (Sorghum bicolor L. ‘Dekalb 57E’) decreased more rapidly in soil that had received prior treatment with nitralin than in soil with no previous treatment. A microbiological influence is suggested because this effect was nullified by autoclaving the soil prior to herbicide treatment. This effect was not apparent with trifluralin. A survey of 250 fields indicated a significant, inverse correlation between nitralin and trifluralin residue level and soil pH. Nitralin persistence was greater in acid than in neutral soil.

Type
Research Article
Information
Weed Science , Volume 21 , Issue 4 , July 1973 , pp. 285 - 288
Copyright
Copyright © 1973 Weed Science Society of America 

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References

Literature Cited

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