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Ecotoxicological information

Toxicity to terrestrial plants

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Administrative data

Endpoint:
toxicity to terrestrial plants: long-term
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Already evaluated by the Competent Authorities for Biocides and Existing Substance Regulations.

Data source

Reference
Reference Type:
publication
Title:
Copper toxicity and phosphorus concentration in Florida-502 oats
Author:
Rhoads, F.M. et al.
Year:
1992
Bibliographic source:
Soil and Crop Science Society of Florida Proceedings 51, 18-20

Materials and methods

Principles of method if other than guideline:
This study was designed to determine P concentration of oat plants as a function of soil-Cu at three lime rates.
GLP compliance:
not specified

Test material

Reference
Name:
Unnamed
Type:
Constituent

Test organisms

Species:
Avena sativa

Study design

Study type:
laboratory study
Substrate type:
natural soil

Results and discussion

Effect concentrations
Species:
Avena sativa
Duration:
49 d
Dose descriptor:
NOEC
Effect conc.:
100 mg/kg soil dw
Conc. based on:
element
Basis for effect:
other: yield (No bioavailability correction possible as CEC is not given or can not be derived.)
Remarks on result:
other: No bioavailability correction possible as CEC is not given or can not be derived.

Any other information on results incl. tables

see Executive summary

Applicant's summary and conclusion

Conclusions:
Reliability: high quality NOEC values is 100 mg/kg (yield)
No bioavailability correction possible as CEC is not given or can not be derived.
Executive summary:

Severe foliage chlorosis has been observed for oats (Avena sativa L.), grown in rotation with tomatoes (Lycoperiscon esculentum Mill.) sprayed with copper hydroxide [Cu (OH2)] to control bacterial diseases where soil Cu level was near 100 mg/kg. This research was conducted to determine P concentration of oat plants as a function of soil-Cu at three lime rates. Oat plants were grown 7 wk in pots containing 2 kg of soil each from the A horizon of Orangeburg loamy fine sand (fine-loamy, siliceous thermic Typic Kandiudult).Copper rates of 0, 100, 200, and 400 mg/kg of time to give a factorial arrangement of 12 treatments, with all treatments receiving 100 mg/kg P. A treatment containing 200 mg7kg P, 400 mg/kg Cu and 6 g/kg lime was also included. Dry-matter yield of oat shoots and roots; tissue content of Cu, P, and Ca; soil-test Cu, P and Ca; and soil pH were determined. Copper concentration in oat plants was positively correlated (P<0.001) with applied Cu, while P concentration, P  uptake, and plant dry weight were negatively correlated (P< 0.001) with applied Cu. Yield of oat plants was almost doubled by increasing P from 100 to 200 mg/kg with 400 mg/kg Cu and 6 g/kg lime. The data suggest that Cu toxicity of oats is due to Cu-induced P deficiency.