Identifying Panicle Initiation in rice


Panicle Initiation (PI) is the start of the reproductive phase of rice development.

It is when the actual panicle or head begins to form in the base of the shoots or stems, just above the soil surface.

The forming of the panicle marks the end of the tillering or vegetative phase and the beginning of the reproductive phase.

PI is defined as when 3 out of 10 main shoots have a panicle 1 to 2 mm long, above the airspace or internode.

Topics include:

  • why is it important to identify PI?
  • when does PI occur?
  • how to identify PI
  • steps in Identifying PI
  • the topdressing window


Primefact 1278 Third Edition

Published: Jun 2018