Registration Dossier

Ecotoxicological information

Toxicity to soil microorganisms

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

NOEC (7 wks): 1550 mg IBDU/kg wet soil

Key value for chemical safety assessment

Additional information

Vertraete et al. (1974) studied the influence of different slow-release fertilizers on some natural soil microbiological populations and compared the effect to those of urea. The influence of the fertilizers was evaluated by applying the compounds at a low and at a high dose, corresponding respectively with the application of 173 kg N/ha and 1215 kg N/ha (222 and 1550 mg IBDU/kg wet soil). Of the populations studied, none were significantly inhibited, but stimulations were noticed with Fungi, and with ammonifying- and nitrite-forming microorganisms.

Four natural organic fertilizers, alone or in combination with isobutylidenediurea (IBDU) were compared with IBDU alone for their effect on soil/root microbial populations associated with bermudagrass (Cynodon sp.) grown on a golf course putting green in southern Florida/USA. No significant differences in microbial populations were observed over a 2-year period (Elliott and Des Jardin 1999).