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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Toxicity to terrestrial plants

Currently viewing:

Administrative data

Endpoint:
toxicity to terrestrial plants: short-term
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Cross-referenceopen allclose all
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to other study

Data source

Reference
Reference Type:
publication
Title:
Unnamed
Year:
2004

Materials and methods

Test guideline
Qualifier:
no guideline followed
GLP compliance:
no

Test material

Constituent 1
Chemical structure
Reference substance name:
Sodium azide
EC Number:
247-852-1
EC Name:
Sodium azide
Cas Number:
26628-22-8
Molecular formula:
N3Na
IUPAC Name:
sodium azide

Sampling and analysis

Analytical monitoring:
no
Details on sampling:
- Concentrations: 0, 50, 75, 100, 125, 150 lbs a.i. / acre.
which is equivalent to 0, 56, 84, 112, 140, 168 kg/ha.

Test substrate

Vehicle:
yes

Test organisms

Species:
other: Cyperus strigosus
Plant group:
Monocotyledonae (monocots)
Details on test organisms:
- Common name: false yellow nutsedge
- Plant family: Cyperaceae

Study design

Test type:
not specified
Study type:
field study
Substrate type:
natural soil
Limit test:
no
Total exposure duration:
5 h
Post exposure observation period:
SEP 100 was applied in 3/4" (1.9 cm) water during a 5 hr period and this was followed 7 days later with an additional 1" (2.54 cm) of water to move the residual material deeper in the soil profile, and 1/2" (1.27 cm) one week later right before planting of cantaloupe on 4 July. The number of weeds per metre of bed was determined for each treatment 7 July.

Test conditions

Test temperature:
no data
pH:
6.2
Moisture:
no data
Nominal and measured concentrations:
no data
Reference substance (positive control):
yes
Remarks:
methyl bromide, 350 lbs/acre (392 kg/ha)

Results and discussion

Effect concentrationsopen allclose all
Species:
other: Cyperus strigosus
Duration:
5 h
Dose descriptor:
EC50
Effect conc.:
ca. 50 lbs/acre
Nominal / measured:
nominal
Conc. based on:
act. ingr.
Basis for effect:
phytotoxicity
Remarks on result:
other: EC50 estimated by regression of data given in figure 1
Species:
other: Cyprerus strigosus
Duration:
5 h
Dose descriptor:
EC50
Effect conc.:
ca. 56 kg/ha
Nominal / measured:
nominal
Conc. based on:
act. ingr.
Basis for effect:
phytotoxicity
Remarks on result:
other: calculated from the above value of 50 lbs/acre
Details on results:
Applications of Sodium azide at all rates reduced weed populations. The relation between numbers of weed and Sodium azide dosage was best described by a negative exponential model with the greatest reductions in weed populations obtained with doses [D] in the range 50

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Executive summary:

The efficacy of Sodium azide for control of weeds was studied with field experiments in 2003. Sodium azide was delivered into soil by drip irrigation using the SEP 100R [American Pacific Corporation, Las Vegas, NV]. The compound was applied at rates within the range of 0 - 200 lbs a.i./acre (0 – 224 kg/ha) and methyl bromide [MB 67 - 33] was injected at 350 lbs/acre (392 kg/ha) to serve as positive control. The experiments were sited in fields naturally infested with severe nutsedge [Cyperus strigosus]. Effective weed control was obtained with rates of 75 lbs a.i./acre (84 kg/ha). Total and marketable yield increased significantly in response to rates of 50 and 75 lbs (56 and 84 kg/ha, respectively); however, there was no additional yield benefit obtained with the use of higher rates. Applications of Sodium azide at rates ≥100 lbs/acre (112 kg/ha) resulted in either no change or in gradual decline in yields with severe phytotoxicity observed for the two highest rates [175 & 200 lbs/acre (196 & 224 kg/ha)]. Control of root-knot, seedling and root diseases, and weeds with sodium azide at rates >75 lbs/acre (84 kg/ha) was equivalent to that obtained with methyl bromide. Results suggest that Sodium azide may be a good substitute for soil fumigation with methyl bromide in cantaloupe production.