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The influence of surfactant and nitrogen on foliar absorption of MON 37500

Published online by Cambridge University Press:  12 June 2017

Patrick A. Miller ,
Philip Westra  and
Scott J. Nissen
Philip Westra
Affiliation:
Department of Bioagricultural Sciences and Pest Management, Colorado State University, Ft. Collins, CO 80523
Scott J. Nissen
Affiliation:
Department of Bioagricultural Sciences and Pest Management, Colorado State University, Ft. Collins, CO 80523
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Extract

Laboratory experiments were conducted to assess the influence of surfactants applied with or without nitrogen on MON 37500 foliar absorption by Bromus tectorum, Bromus japonicus, Aegilops cylindrica, Triticum aestivum, Chorispora tenella, and Lactuca serriola. MON 37500 absorption in B. tectorum and B. japonicus increased from 40% 24 h after treatment (HAT) to 48% 48 HAT, averaged across surfactants with no added nitrogen. Averaged across nitrogen source and species, nonionic surfactant, ethylated seed oil, and organosilicate provided comparable enhancement of MON 37500 absorption (56 to 68%), whereas crop oil concentrate provided only 27 to 29% absorption under the same conditions. Averaged across species and surfactant class, urea ammonium nitrate had the greatest effect on MON 37500 absorption (68%), compared to ammonium sulfate (59%) or no nitrogen (40%). Nitrogen, regardless of the type, significantly improved foliar absorption of MON 37500. MON 37500 absorption by species was 71, 63, 57, 57, 49, and 38% in C. tenella, B. japonicus, T. aestivum, A. cylindrica, B. tectorum, and L. serriola, respectively, when averaged across surfactants and nitrogen. Densely pubescent B. japonicus leaves did not retain significant amounts of MON 37500 following a primary leaf wash.

Keywords

MON 37500Aegilops cylindrica Host AEGCY, jointed goatgrassBromus japonicus Thunb. ex Murr. BROJA, Japanese bromeBromus tectorum L. BROTE, downy bromeChorispora tenella (Pallas) DC. COBTE, blue mustardLactuca serriola L. LACSE, prickly lettuceTriticum aestivum L., c.v. ‘Tam 107,’ wheatFoliar absorptionsurfactantsammonium sulfateurea ammonium nitratewinter annual grasseswinter annual broadleaf weedsAEGCYBROJABROTECOBTELACSE
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 47 , Issue 3 , June 1999 , pp. 270 - 274
Copyright
Copyright © 1999 by the Weed Science Society of America 

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References

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