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Release of Soil-Bound Prometryne Residues Under Different Soil pH and Nitrogen Fertilizer Regimes

Published online by Cambridge University Press:  12 June 2017

Dennis Yee ,
Pearl Weinberger  and
Shahamat U. Khan
Dennis Yee
Affiliation:
Dep. Biol., Univ. Ottawa, Ottawa, ON, Canada K1N 9B4
Pearl Weinberger*
Affiliation:
Dep. Biol., Univ. Ottawa, Ottawa, ON, Canada K1N 9B4
Shahamat U. Khan
Affiliation:
Chem. and Biol. Res. Instit., Res. Branch, Agric. Canada, Ottawa, ON, Canada K1A 0C6
*
All correspondence should be addressed to the second author.
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Abstract

The release of soil-bound 14C-prometryne [N,N′-bis(l-methylethyl)-6-(methylthio)-1,3,5-triazine-2,4-diamine] residues was affected by soil pH, fertilizer treatments (with or without plants), and the crop species wheat [Triticum aestivum (L.) Merr. ‘Marquis’] and soybean [Glycine max (L.) Merr. ‘Maple Presto’]. More of the bound radioactivity was released following large pH changes in the soil than with small deviations. In addition, more 14C-prometryne was found in the extracts of the soil incubated with large pH alterations. Fertilizing with ionic nitrogen sources (NO3– and NH4+) in the absence of plants was also responsible for releasing higher levels of radioactivity than with the nonionic fertilizer urea. These fertilizer-induced differences in release were not apparent when wheat plants were added to the system. Release of the bound radioactivity, however, was plant specific, particularly in the rhizoplane, since soybean roots elicited a greater release in the rhizoplane than wheat roots. Transport and metabolism of these residues were also plant specific.

Keywords

Growth studynonextractable residuesGlycine maxTriticum aestivum
Type
Soil, Air, and Water
Information
Weed Science , Volume 33 , Issue 6 , November 1985 , pp. 882 - 887
Copyright
Copyright © 1985 by the Weed Science Society of America 

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References

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