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EC number: 278-636-5 | CAS number: 77182-82-2
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Toxicity to terrestrial plants
Administrative data
- Endpoint:
- toxicity to terrestrial plants: short-term
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2011
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 011
- Report date:
- 2011
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 208 (Terrestrial Plants Test: Seedling Emergence and Seedling Growth Test)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 850.4225 (Seedling Emergence Tier II)
- Version / remarks:
- April 1996
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
Test material
- Reference substance name:
- Ammonium 2-amino-4-(hydroxymethylphosphinyl)butyrate
- EC Number:
- 278-636-5
- EC Name:
- Ammonium 2-amino-4-(hydroxymethylphosphinyl)butyrate
- Cas Number:
- 77182-82-2
- Molecular formula:
- C5H12NO4P.H3N
- IUPAC Name:
- ammonium 2-amino-4-[hydroxy(methyl)phosphoryl]butanoate
Constituent 1
Sampling and analysis
- Analytical monitoring:
- yes
- Details on sampling:
- The stock solution used for preparation of the spray solutions was analysed.
Test substrate
- Vehicle:
- no
- Details on preparation and application of test substrate:
- The test item was dissolved in deionised water and was applied once with 100 L/ha using a spray chamber. The spray solution was applied once, at test initiation on the soil surface. For the untreated controls a spray solution of 100 L deionized water/ha was applied.
Test organisms
- Species:
- Lactuca sativa
- Plant group:
- Dicotyledonae (dicots)
Study design
- Test type:
- seedling emergence and seedling growth test
- Study type:
- laboratory study
- Substrate type:
- artificial soil
- Remarks:
- mixture of standard silt loam soil + 30% washed sand
- Limit test:
- no
- Total exposure duration:
- 21 d
Test conditions
- Test temperature:
- 23 +- 8 °C day and 18 +- 8 ° C night
- pH:
- Soil pH = 7.24 (CaCl2)
- Moisture:
- Regulated to maintain 70 30%water
- Details on test conditions:
- Soil
Soil mixture The used soil is a mixture of standard silt loam soil + 30% washed sand from Bayer CropScience AG, Global Biology Herbicides, Horticulture, H 872, Industriepark Hoechst, D-65926 Frankfurt am Main. The soil was sieved to 2 mm. The soil was analysed separately with GLP in the laboratory of LUFA Speyer, Obere Langgasse 40, D-67346 Speyer.
Sterilisation: 120 degrees vapour for about 30 minutes.
Fertilization: 2.4 g Blaukorn per liter
Composition and particle size: <0.002 mm clay = 13.3 %
0.002 - 0.006 mm silt = 4.5 %
0.006 - 0.020 mm silt = 10.8 %
0.020 - 0.063 mm silt = 21.4 %
0.063 - 0.200 mm sand = 7.5 %
0.200 - 0.630 mm sand = 29.8 %
0.630 - 2.0 mm sand = 12.7 %
Cation capacity: 23.75 meq/100 g
Lime content: 0.7 % CaCO3
Organic carbon: 0.63 % Corg
pH – value: 7 .24 (CaCl2)
Climatic conditions
Light Regime: Regulated to maintain at least 16 h light
Light intensity: Natural daylight supplemented by artificial lighting.
Regulation: at light intensities >15000 lux the lamps turn off and when >50000 lux the shading closes.
Watering: Prior to spray application, pots were top watered to moisten the upper layer of soil. After the pots were sprayed and the exposure phase begun, water was given by subirrigation only. Irrigation was provided throughout the study via bottom watering. Pots were contained in saucers standing under each pot and water was given and retained within the saucer according to the need of the plants in order to have an optimal water supply for plant growth. This was checked daily.
Exposure Time: 21 days after application.
Liquid Fertilization: None.
Test vessels and sowing
Pots; Type and Size: Commercial plastic flower pots (10.5 cm diameter).
Number of Pots: 8 pots per treatment group.
Number of Seeds: Each pot contained 5 seeds. In total 40 seeds per treatment group were tested.
Sowing: The seeds were pressed into the soil surface and completely covered with a layer of a mixture quarz sand / used soil (ratio 1/1 v/v). Soil was top watered immediately to facilitate germination. Sowing and application of the pots occured during the same day. - Nominal and measured concentrations:
- Application rates in kg active ingredient / ha
0.06, 0.12, 0.24, 0.48, 0.97, 1.93 - Reference substance (positive control):
- no
Results and discussion
Effect concentrationsopen allclose all
- Species:
- Lactuca sativa
- Duration:
- 21 d
- Dose descriptor:
- EC50
- Effect conc.:
- > 1.93 kg/ha
- Nominal / measured:
- nominal
- Conc. based on:
- act. ingr.
- Basis for effect:
- seedling emergence
- Species:
- Lactuca sativa
- Duration:
- 21 d
- Dose descriptor:
- NOEC
- Effect conc.:
- 1.93 kg/ha
- Nominal / measured:
- nominal
- Conc. based on:
- act. ingr.
- Basis for effect:
- seedling emergence
- Species:
- Lactuca sativa
- Duration:
- 21 d
- Dose descriptor:
- EC50
- Effect conc.:
- 0.65 kg/ha
- Nominal / measured:
- nominal
- Conc. based on:
- act. ingr.
- Basis for effect:
- other: Survival
- Species:
- Lactuca sativa
- Duration:
- 21 d
- Dose descriptor:
- NOEC
- Effect conc.:
- 0.24 kg/ha
- Nominal / measured:
- nominal
- Conc. based on:
- act. ingr.
- Basis for effect:
- other: Survival
- Species:
- Lactuca sativa
- Duration:
- 21 d
- Dose descriptor:
- EC50
- Effect conc.:
- > 0.97 kg/ha
- Nominal / measured:
- nominal
- Conc. based on:
- act. ingr.
- Basis for effect:
- growth
- Remarks:
- Shoot length
- Species:
- Lactuca sativa
- Duration:
- 21 d
- Dose descriptor:
- NOEC
- Effect conc.:
- 0.97 kg/ha
- Nominal / measured:
- nominal
- Conc. based on:
- act. ingr.
- Basis for effect:
- growth
- Remarks:
- Shoot length
- Species:
- Lactuca sativa
- Duration:
- 21 d
- Dose descriptor:
- EC50
- Effect conc.:
- > 0.97 kg/ha
- Nominal / measured:
- nominal
- Conc. based on:
- act. ingr.
- Basis for effect:
- growth
- Remarks:
- Shoot dry weight
- Species:
- Lactuca sativa
- Duration:
- 21 d
- Dose descriptor:
- NOEC
- Effect conc.:
- 0.97 kg/ha
- Nominal / measured:
- nominal
- Conc. based on:
- act. ingr.
- Basis for effect:
- growth
- Remarks:
- Shoot dry weight
- Details on results:
- Analysis of stock solution
Measured concentrations of Glufosinate-ammonium in the highest application rate ranged from 100.0-100.4% of the nominal test concentration.
Test results
An application of the test substance to the soil surface of pots in which Lettuce (Lactuca sativa) seeds had been sown had no statistically significant effect on the emergence at any application rates tested. The NOER for this endpoint was calculated as the highest application rate tested of 1.93 kg a.i./ha.
As there were no significant effects observed on the emergence, no meaningful rate / response relation could be derived (p(F) > 0.05). Thus, the ER25 and ER50 values for emergence were set for both as >1.93 kg a.i./ha.
Survival was statistically significantly affected at application rates including and above 0.48 kg a.i./ha. The NOER for this endpoint was calculated as 0.24 kg a.i./ha. The LR25 value was calculated as 0.37 kg a.i./ha. The LR50 value was calculated as 0.65 kg a.i./ha.
Shoot length was not affected at any application rates tested. No computations were performed by the program due to the absence of shoot length inhibition observed. The NOER for this endpoint was set as 0.97 kg a.i./ha, the ER25 and ER50 values for shoot length were set for both as >0.97 kg a.i./ha as there was 100% mortality at the application rate of 1.93 kg a.i./ha.
Shoot dry weight was not statistically significantly affected at any application rates tested. The NOER for this endpoint was calculated as 1.93 kg a.i./ha but is considered as being an artefact as there was 100% mortality at the application rate of 1.93 kg a.i./ha and set as 0.97 kg a.i./ha. No meaningful rate / response relation could be derived (p(F) > 0.05), thus, the ER25 and ER50 values for shoot dry weight were set for both as >0.97 kg a.i./ha.
At the application rate of 0.97 kg a.i./ha, marginal phytotoxic symptoms visualised as chlorosis and stunting at day 21.
There were no effects on growth stage of emerged seedlings in comparison with the untreated controls up to the application rate of 0.97 kg a.i./ha.
There was 100% mortality at the application rate of 1.93 kg a.i./ha.
Any other information on results incl. tables
Results tables
Emergence
Treatm.[kg a.i./ha] |
Prepared |
Emerged |
Not-emerged |
%Not-emerged |
%Emerged |
Control |
40 |
33 |
7 |
17.5 |
82.5 |
0.06 |
40 |
30 |
10 |
25.0 |
75.0 |
0.01 |
40 |
32 |
8 |
20.0 |
80.0 |
0.24 |
40 |
34 |
6 |
15.0 |
85.0 |
0.48 |
40 |
27 |
13 |
32.5 |
67.5 |
0.97 |
40 |
29 |
11 |
27.5 |
72.5 |
1.93 |
40 |
27 |
13 |
32.5 |
67.5 |
Post-emergence survival after 21 days
Treatm.[kg a.i./ha] |
Emerged |
Survived |
Not-survived |
%Mortality |
%Survival |
Control |
33 |
33 |
0 |
0.0 |
100.0 |
0.06 |
30 |
29 |
1 |
3.3 |
96.7 |
0.12 |
32 |
30 |
2 |
6.3 |
93.8 |
0.24 |
34 |
33 |
1 |
2.9 |
97.1 |
0.48 |
27 |
21 |
6 |
22.2 |
77.8 |
0.97 |
29 |
9 |
20 |
69.0 |
31.0 |
1.93 |
27 |
0 |
27 |
100.0 |
0.0 |
Shoot length after 21 days
Treatm.[kg a.i./ha] |
Mean in cm |
Std. Dev. |
n |
%Reduction |
Control |
7.556 |
1.7418 |
8 |
0.0 |
0.06 |
8.779 |
0.5114 |
8 |
-16.2 |
0.12 |
8.419 |
0.5000 |
8 |
-11.4 |
0.24 |
8.531 |
0.7188 |
8 |
-12.9 |
0.48 |
8.675 |
0.5792 |
8 |
-14.8 |
0.97 |
8.083 |
0.8010 |
6 |
-7.0 |
1.93 |
n.d. |
n.d. |
0 |
n.d. |
n.d. = not determinable due to 100 % post-emergence mortality
Shoot dry weight after 21 days
Treatm.[kg a.i./ha] |
Mean in g |
Std. Dev. |
n |
%Reduction |
Control |
0.176 |
0.1718 |
8 |
0.0 |
0.06 |
0.153 |
0.1699 |
8 |
13.2 |
0.12 |
0.101 |
0.0204 |
8 |
42.8 |
0.24 |
0.111 |
0.0225 |
8 |
36.7 |
0.48 |
0.126 |
0.0361 |
8 |
28.2 |
0.97 |
0.127 |
0.0542 |
6 |
27.6 |
1.93 |
n.d. |
n.d. |
0 |
n.d. |
n.d. = not determinable due to 100 % post-emergence mortality
Phytotoxicity after 21 days
Day 21 phytotoxicity summary (mean % damage) |
|
kg a.i./ha |
Lactuca sativa |
Control |
0 |
0.06 |
0 |
0.12 |
0 |
0.24 |
0 |
0.48 |
0 |
0.97 |
3.3 (af)* |
1.93 |
†† |
*Phytotoxicity was assessed according to EPPO Standard 135 (a= chlorosis (yellowing of green shoot tissue;f= stunting (plant height reduced with shorter internode length)
††: 100% mortality
Effect on growth stages
BBCH* Min-Max at application rates (kg a.i. /ha) |
|||||||
plant species |
control |
0.06 |
0.12 |
0.24 |
0.48 |
0.97 |
1.93 |
Lactuca sativa |
12-15 |
14-15 |
14-15 |
14-15 |
14-15 |
14-15 |
†† |
* Biologische Bundesanstalt, Bundessortenamt and Chemical Industry
††: 100% mortality
Applicant's summary and conclusion
- Validity criteria fulfilled:
- yes
- Conclusions:
- The seedling emergence study in which the effect ofglyfosinate ammoniumon Lettuce (Lactuca sativa) was tested under glasshouse conditions resulted in a lowest NOER of 0.24 kg a.i./ha (based on survival), a lowest ER50 of 0.65 kg a.i./ha (based on survival) and a lowest ER25 of 0.37 kg a.i./ha (based on survival).
- Executive summary:
The seedling emergence study in which the effect ofglyfosinate ammoniumon Lettuce (Lactuca sativa) was tested under glasshouse conditions resulted in a lowest NOER of 0.24 kg a.i./ha (based on survival), a lowest ER50 of 0.65 kg a.i./ha (based on survival) and a lowest ER25 of 0.37 kg a.i./ha (based on survival).
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