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Ecotoxicological information

Toxicity to terrestrial plants

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Description of key information

No EC50 or NOEC could be determined.

Key value for chemical safety assessment

Additional information

Three valid studies with terrestrial plants were found. The study performed by Backus (1991) was according to standard protocol (vegetative vigor) and under GLP conditions. Plants of several species were sprayed with a solution of sodium chlorate at just one concentration which gave a field rate of 39.0 g/m2(390 kg/ha), a concentration which is incidentally far greater than the recommended application rate as a herbicide. From day 4, necrosis was observed on all treated plants. After 11 days almost all treated plants were dead, corn appeared to be less affected. The fresh weight of oats was least effected, the treated weight was 61.1% of that of the control. Fiebig (2007B) performed a vegetative vigor test as well, according to OECD guideline under GLP conditions. She applied sodium chlorate at the start of the test on the foliage of several plant species.The lowest NOEC's of the test item were lower than 0.77 kg/ha (the lowest tested concentration) for several species. Fiebig (2007A) performed another test according to standard OECD protocol under GLP conditions. This was a seedling emergence test in which sodium chlorate was sprayed once onto the soil surface after the seeds of several plant species were sown. Sugar beet and carrot were the most sensitive species with a NOEL of 13.9 kg/ha.

These tests were performed for pesticides application of sodium chlorate. For general use of sodium chlorate this is most likely not the way seeds or plants will be exposed.