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Effect of Soil Organic Matter on the Phytotoxicity of Thirteen s-Triazine Herbicides

Published online by Cambridge University Press:  12 June 2017

A. Rahman  and
L. J. Matthews
A. Rahman
Affiliation:
Weed Res. Group, Ruakura Agric. Res. Centre, Hamilton, New Zealand
L. J. Matthews
Affiliation:
Weed Res. Group, Ruakura Agric. Res. Centre, Hamilton, New Zealand
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Abstract

The influence of soil organic matter on the initial and residual phytotoxicity of thirteen s-triazine herbicides was investigated in greenhouse experiments using three Horotiu sandy loam soils with organic matter levels of 9.8, 15.5, and 20.6%. The amount of herbicide required to reduce the growth of oats (Avena sativa L. ‘Mapua’) by 50% (GR50) when compared with the control was determined for each herbicide and each organic matter level. Results showed that the GR50 values for all herbicides were highly and positively correlated with the soil organic matter. In general, the phytotoxicity of compounds of high water solubility was less influenced by soil organic matter than those having low water solubility. The chloro-triazines persisted longer in soil than did the methoxy- or methylthio-triazines. Simazine [2-chloro-4,6-bis(ethylamino)-s-triazine] and atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine] were the most persistent of the chloro-triazines.

Keywords

Avena sativapersistencephytotoxicity
Type
Research Article
Information
Weed Science , Volume 27 , Issue 2 , March 1979 , pp. 158 - 161
Copyright
Copyright © 1979 by the Weed Science Society of America 

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