PROCEDE PRATIQUE POUR DETERMINER LE MOMENT D'APPLICATION D'UN AGENT D'HYBRIDATION CHIMIQUE.

摘要

The time for applying a chemical hybridizing agent to seed parent plants of winter habit wheat variety is confirmed when the following three conditions are satisfied: (a) the average young spike length of the main stem is between 30 mm and 60 mm, both inclusive, (b) the index number of flag leaf development is between 6.5 and 11, both inclusive, and (c) the index number of flag leaf development >/= 0.2 x the average young spike length of the main stem (mm) - 1.5. Foliar-applying a chemical hybridizing agent at a time as confirmed above enables the stable production of wheat F1 hybrid seeds.