Registration Dossier
Registration Dossier
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EC number: 237-066-7 | CAS number: 13598-36-2
Toxicity to terrestrial plants
Administrative data
Link to relevant study record(s)
Description of key information
Serious inhibition of growth was observed at recalculated levels of 700 mg phosphonic acid per kg soil dw. No EC50 could be derived.
Key value for chemical safety assessment
Additional information
A range of studies is available studying the effects of phosphite (H2PO3-) on plant growth. This is related to the potential fertilizing and fungicidal effect of the test substance.
Growth reduction was observed in young mandarin trees and in maize plants when treated with phosphite at dose rates equalling P-fertiliser levels. Foliar application caused leave burn whereas in general an abnormal habitus was observed. The effect of phosphite was less pronounced or absent when the nutritional status of the tree was optimal, in other words, when the plant did not need phosphite as a source of P.
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