ISSN:
1573-5117
Keywords:
herbicides
;
bioassays
;
phytotoxicity
;
persistence
;
herbicide residues
;
biological activity
;
soil residual activity
;
sulfonylurea herbicides
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Sulfonylurea herbicides are potent inhibitors of plant growth and are extremely active against a wide spectrum of weeds. They are used at very low rates (10–50 g ai/ha) and cause rapid inhibition of root and shoot growth of young plants. Routine chemical assays for detecting low levels of these compounds are difficult and there is need to develop sensitive bioassay methods for detecting their extremely low residue levels in the soil. This paper describes a simple pot bioassay method with a self watering system using turnip (Brassica rapa) seedlings as test plants for quantitative determination of sulfonylurea herbicides. Results are presented with six of these compounds whose activity was investigated in widely differing substrates. The potential availability to plants was calculated from the dose-response curves in different substrates. The dose-response relationship has been described by a specifically developed computer model. Details are also given of a direct seeded bioassay method with controlled watering system using several test species for detection of sulfonylurea herbicides. The potential uses and practical applications of both techniques are discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00027802
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