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Published online 1 May 2008
Published in J Environ Qual 37:830-838 (2008)
DOI: 10.2134/jeq2007.0256
© 2008 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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Effects of Soil Phosphorus Status on Environmental Risk Assessment of Glyphosate and Glufosinate-Ammonium

Pirkko Laitinena, Katri Siimesb, Sari Rämöa,*, Lauri Jauhiainena, Liisa Eronenc, Seija Oinonena and Helinä Hartikainend

a MTT Agrifood Research Finland, FI-31600 Jokioinen, Finland
b SYKE Finnish Environment Inst., P.O. Box 140, FI-00251 Helsinki, Finland
c SBRC Sugar Beet Research Centre, Korvenkyläntie 201, FI-25170 Kotalato, Finland
d Dep. of Applied Chemistry and Microbiology, Box 27, FI-00014 Univ. of Helsinki, Finland


Figure 1
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Fig. 1. Chemical structures of glyphosate and glufosinate-ammonium.

 

Figure 2
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Fig. 2. Glyphosate (A and B) and glufosinate-ammonium (C and D) adsorption isotherms at different agronomic phosphorus levels from fair to excessive. n = 4. Note the different scales.

 

Figure 3
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Fig. 3. Sorption percentiles of applied glyphosate and glufosinate-ammonium in phosphorus-adjusted sandy loam soil. The herbicide addition levels used were 2 mg L–1 for glyphosate and 1 mg L–1 for glufosinate-ammonium.

 

Figure 4
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Fig. 4. Observed KF (see Table 2) of glyphosate (A) and glufosinate-ammonium (B) versus soil acid ammonium acetate–extractable phosphorus (PAC), and fitted models.

 





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