Adjective modifier

• critical: In the case of hamsters the critical photoperiod is 12.5 hours.

• inductive: The time taken to form primordia varies with the length of the inductive photoperiod.

Modifies a noun

• manipulation: The analysis of the egg production records was used to evaluate the success of photoperiod manipulation in each group.

• change: THC production is probably associated with the induction of flowering resulting from the photoperiod change.

Noun used with modifier

• h: The isolates were cultured at 22°C with a 12 h photoperiod.